From 6b33c30616d544df2d78d0669809d5c106729482 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:05:08 +0100
Subject: [PATCH 01/10] Fixing notifications __init__ because it was generating
 migration problems

---
 taiga/projects/attachments/api.py        |  2 +-
 taiga/projects/issues/api.py             |  2 +-
 taiga/projects/issues/models.py          |  2 +-
 taiga/projects/milestones/api.py         |  2 +-
 taiga/projects/milestones/models.py      |  2 +-
 taiga/projects/notifications/__init__.py | 20 --------------------
 taiga/projects/tasks/api.py              |  2 +-
 taiga/projects/tasks/models.py           |  2 +-
 taiga/projects/userstories/api.py        |  2 +-
 taiga/projects/userstories/models.py     |  2 +-
 taiga/projects/wiki/api.py               |  2 +-
 taiga/projects/wiki/models.py            |  2 +-
 12 files changed, 11 insertions(+), 31 deletions(-)

diff --git a/taiga/projects/attachments/api.py b/taiga/projects/attachments/api.py
index d54e9aa4..a63b3aa4 100644
--- a/taiga/projects/attachments/api.py
+++ b/taiga/projects/attachments/api.py
@@ -31,7 +31,7 @@ from taiga.base import filters
 from taiga.base import exceptions as exc
 from taiga.users.models import User
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 
 from . import permissions
diff --git a/taiga/projects/issues/api.py b/taiga/projects/issues/api.py
index e4701fd9..ab0878f0 100644
--- a/taiga/projects/issues/api.py
+++ b/taiga/projects/issues/api.py
@@ -30,7 +30,7 @@ from taiga.base import tags
 
 from taiga.users.models import User
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.occ import OCCResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 
diff --git a/taiga/projects/issues/models.py b/taiga/projects/issues/models.py
index e43bace3..35aad2f1 100644
--- a/taiga/projects/issues/models.py
+++ b/taiga/projects/issues/models.py
@@ -22,7 +22,7 @@ from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
 from taiga.projects.occ import OCCModelMixin
-from taiga.projects.notifications import WatchedModelMixin
+from taiga.projects.notifications.mixins import WatchedModelMixin
 from taiga.projects.mixins.blocked import BlockedMixin
 from taiga.base.tags import TaggedMixin
 
diff --git a/taiga/projects/milestones/api.py b/taiga/projects/milestones/api.py
index 2d3a3e50..e5c58b76 100644
--- a/taiga/projects/milestones/api.py
+++ b/taiga/projects/milestones/api.py
@@ -25,7 +25,7 @@ from taiga.base import exceptions as exc
 from taiga.base.decorators import detail_route
 from taiga.base.api import ModelCrudViewSet
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 
 
diff --git a/taiga/projects/milestones/models.py b/taiga/projects/milestones/models.py
index 899c8616..2e4e9199 100644
--- a/taiga/projects/milestones/models.py
+++ b/taiga/projects/milestones/models.py
@@ -22,7 +22,7 @@ from django.core.exceptions import ValidationError
 
 from taiga.base.utils.slug import slugify_uniquely
 from taiga.base.utils.dicts import dict_sum
-from taiga.projects.notifications import WatchedModelMixin
+from taiga.projects.notifications.mixins import WatchedModelMixin
 from taiga.projects.userstories.models import UserStory
 
 import itertools
diff --git a/taiga/projects/notifications/__init__.py b/taiga/projects/notifications/__init__.py
index 5978b735..e69de29b 100644
--- a/taiga/projects/notifications/__init__.py
+++ b/taiga/projects/notifications/__init__.py
@@ -1,20 +0,0 @@
-# Copyright (C) 2014 Andrey Antukh <niwi@niwi.be>
-# Copyright (C) 2014 Jesús Espino <jespinog@gmail.com>
-# Copyright (C) 2014 David Barragán <bameda@dbarragan.com>
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as
-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from .mixins import WatchedResourceMixin
-from .mixins import WatchedModelMixin
-
-__all__ = ["WatchedModelMixin", "WatchedResourceMixin"]
diff --git a/taiga/projects/tasks/api.py b/taiga/projects/tasks/api.py
index 348b4b7f..d3727b78 100644
--- a/taiga/projects/tasks/api.py
+++ b/taiga/projects/tasks/api.py
@@ -22,7 +22,7 @@ from taiga.base.decorators import list_route
 from taiga.base.api import ModelCrudViewSet
 from taiga.projects.models import Project
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 from taiga.projects.occ import OCCResourceMixin
 
diff --git a/taiga/projects/tasks/models.py b/taiga/projects/tasks/models.py
index 9f71dd3b..25225d42 100644
--- a/taiga/projects/tasks/models.py
+++ b/taiga/projects/tasks/models.py
@@ -21,7 +21,7 @@ from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
 
 from taiga.projects.occ import OCCModelMixin
-from taiga.projects.notifications import WatchedModelMixin
+from taiga.projects.notifications.mixins import WatchedModelMixin
 from taiga.projects.mixins.blocked import BlockedMixin
 from taiga.base.tags import TaggedMixin
 
diff --git a/taiga/projects/userstories/api.py b/taiga/projects/userstories/api.py
index f1a87c9a..f5648fec 100644
--- a/taiga/projects/userstories/api.py
+++ b/taiga/projects/userstories/api.py
@@ -30,7 +30,7 @@ from taiga.base import exceptions as exc
 from taiga.base.decorators import list_route
 from taiga.base.api import ModelCrudViewSet
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 from taiga.projects.occ import OCCResourceMixin
 
diff --git a/taiga/projects/userstories/models.py b/taiga/projects/userstories/models.py
index 77e487eb..d0038441 100644
--- a/taiga/projects/userstories/models.py
+++ b/taiga/projects/userstories/models.py
@@ -21,7 +21,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
 
 from taiga.projects.occ import OCCModelMixin
-from taiga.projects.notifications import WatchedModelMixin
+from taiga.projects.notifications.mixins import WatchedModelMixin
 from taiga.projects.mixins.blocked import BlockedMixin
 from taiga.base.tags import TaggedMixin
 
diff --git a/taiga/projects/wiki/api.py b/taiga/projects/wiki/api.py
index 6942e628..9970502d 100644
--- a/taiga/projects/wiki/api.py
+++ b/taiga/projects/wiki/api.py
@@ -28,7 +28,7 @@ from taiga.base.decorators import list_route
 from taiga.projects.models import Project
 from taiga.mdrender.service import render as mdrender
 
-from taiga.projects.notifications import WatchedResourceMixin
+from taiga.projects.notifications.mixins import WatchedResourceMixin
 from taiga.projects.history.mixins import HistoryResourceMixin
 from taiga.projects.occ import OCCResourceMixin
 
diff --git a/taiga/projects/wiki/models.py b/taiga/projects/wiki/models.py
index bfe926f8..4f8c6f4c 100644
--- a/taiga/projects/wiki/models.py
+++ b/taiga/projects/wiki/models.py
@@ -19,7 +19,7 @@ from django.contrib.contenttypes import generic
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
-from taiga.projects.notifications import WatchedModelMixin
+from taiga.projects.notifications.mixins import WatchedModelMixin
 from taiga.projects.occ import OCCModelMixin
 
 

From a68785a380ad941cf91e820174c4c5c31e8a8ddd Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:06:58 +0100
Subject: [PATCH 02/10] Refactoring modify notifications

---
 settings/common.py                       |  1 +
 taiga/projects/history/models.py         | 13 +++-
 taiga/projects/history/services.py       |  8 +++
 taiga/projects/notifications/mixins.py   |  3 +-
 taiga/projects/notifications/models.py   | 26 +++++++-
 taiga/projects/notifications/services.py | 77 +++++++++++++++++++-----
 taiga/projects/userstories/api.py        |  1 -
 7 files changed, 110 insertions(+), 19 deletions(-)

diff --git a/settings/common.py b/settings/common.py
index c79edb63..3aef9bdf 100644
--- a/settings/common.py
+++ b/settings/common.py
@@ -332,6 +332,7 @@ TAGS_PREDEFINED_COLORS = ["#fce94f", "#edd400", "#c4a000", "#8ae234",
 FEEDBACK_ENABLED = True
 FEEDBACK_EMAIL = "support@taiga.io"
 
+CHANGE_NOTIFICATIONS_MIN_INTERVAL = 30 #seconds
 
 # NOTE: DON'T INSERT MORE SETTINGS AFTER THIS LINE
 TEST_RUNNER="django.test.runner.DiscoverRunner"
diff --git a/taiga/projects/history/models.py b/taiga/projects/history/models.py
index ab58b312..ec79f91f 100644
--- a/taiga/projects/history/models.py
+++ b/taiga/projects/history/models.py
@@ -76,6 +76,18 @@ class HistoryEntry(models.Model):
     # snapshot. The rest are partial snapshot.
     is_snapshot = models.BooleanField(default=False)
 
+    @cached_property
+    def is_change(self):
+      return self.type == HistoryType.change
+
+    @cached_property
+    def is_create(self):
+      return self.type == HistoryType.create
+
+    @cached_property
+    def is_delete(self):
+      return self.type == HistoryType.delete
+
     @cached_property
     def owner(self):
         pk = self.user["pk"]
@@ -198,4 +210,3 @@ class HistoryEntry(models.Model):
 
     class Meta:
         ordering = ["created_at"]
-
diff --git a/taiga/projects/history/services.py b/taiga/projects/history/services.py
index 3401f42a..31e56f99 100644
--- a/taiga/projects/history/services.py
+++ b/taiga/projects/history/services.py
@@ -73,6 +73,14 @@ def make_key_from_model_object(obj:object) -> str:
     return "{0}:{1}".format(tn, obj.pk)
 
 
+def get_model_from_key(key:str) -> object:
+    """
+    Get model from key
+    """
+    class_name, pk = key.split(":", 1)
+    return apps.get_model(class_name)
+
+
 def register_values_implementation(typename:str, fn=None):
     """
     Register values implementation for specified typename.
diff --git a/taiga/projects/notifications/mixins.py b/taiga/projects/notifications/mixins.py
index f5be6166..362635a4 100644
--- a/taiga/projects/notifications/mixins.py
+++ b/taiga/projects/notifications/mixins.py
@@ -62,8 +62,7 @@ class WatchedResourceMixin(object):
 
         # Get a complete list of notifiable users for current
         # object and send the change notification to them.
-        users = services.get_users_to_notify(obj, history=history)
-        services.send_notifications(obj, history=history, users=users)
+        services.send_notifications(obj, history=history)
 
     def post_save(self, obj, created=False):
         self.send_notifications(obj)
diff --git a/taiga/projects/notifications/models.py b/taiga/projects/notifications/models.py
index bdff3d90..1b62ce0a 100644
--- a/taiga/projects/notifications/models.py
+++ b/taiga/projects/notifications/models.py
@@ -19,7 +19,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
 
 from .choices import NOTIFY_LEVEL_CHOICES
-
+from taiga.projects.history.choices import HISTORY_TYPE_CHOICES
 
 class NotifyPolicy(models.Model):
     """
@@ -43,3 +43,27 @@ class NotifyPolicy(models.Model):
             self.modified_at = timezone.now()
 
         return super().save(*args, **kwargs)
+
+
+class HistoryChangeNotification(models.Model):
+    """
+    This class controls the pending notifications for an object, it should be instantiated
+    or updated when an object requires notifications.
+    """
+    key = models.CharField(max_length=255, unique=False, editable=False)
+    owner = models.ForeignKey("users.User", null=False, blank=False,
+                              verbose_name="owner",related_name="+")
+    created_datetime = models.DateTimeField(null=False, blank=False, auto_now_add=True,
+                                            verbose_name=_("created date time"))
+    updated_datetime = models.DateTimeField(null=False, blank=False, auto_now_add=True,
+                                            verbose_name=_("updated date time"))
+    history_entries = models.ManyToManyField("history.HistoryEntry", null=True, blank=True,
+                                             verbose_name="history entries",
+                                             related_name="+")
+    notify_users = models.ManyToManyField("users.User", null=True, blank=True,
+                                             verbose_name="notify users",
+                                             related_name="+")
+    project = models.ForeignKey("projects.Project", null=False, blank=False,
+                                verbose_name="project",related_name="+")
+
+    history_type = models.SmallIntegerField(choices=HISTORY_TYPE_CHOICES)
diff --git a/taiga/projects/notifications/services.py b/taiga/projects/notifications/services.py
index 1b8c86c0..746beace 100644
--- a/taiga/projects/notifications/services.py
+++ b/taiga/projects/notifications/services.py
@@ -19,6 +19,9 @@ from functools import partial
 from django.apps import apps
 from django.db import IntegrityError
 from django.contrib.contenttypes.models import ContentType
+from django.utils import timezone
+from django.db import transaction
+from django.conf import settings
 
 from djmail import template_mail
 
@@ -26,7 +29,12 @@ from taiga.base import exceptions as exc
 from taiga.base.utils.text import strip_lines
 from taiga.projects.notifications.choices import NotifyLevel
 from taiga.projects.history.choices import HistoryType
+from taiga.projects.history.services import (make_key_from_model_object,
+                                             get_last_snapshot_for_key,
+                                             get_model_from_key)
+from taiga.users.models import User
 
+from .models import HistoryChangeNotification
 
 def notify_policy_exists(project, user) -> bool:
     """
@@ -113,7 +121,7 @@ def analize_object_for_watchers(obj:object, history:object):
             obj.watchers.add(user)
 
 
-def get_users_to_notify(obj, *, history) -> list:
+def get_users_to_notify(obj, *, discard_users=None) -> list:
     """
     Get filtered set of users to notify for specified
     model instance and changer.
@@ -138,18 +146,18 @@ def get_users_to_notify(obj, *, history) -> list:
     candidates.update(filter(_can_notify_light, obj.get_participants()))
 
     # Remove the changer from candidates
-    candidates.discard(history.owner)
+    if discard_users:
+        candidates = candidates - set(discard_users)
 
     return frozenset(candidates)
 
 
-def _resolve_template_name(obj, *, change_type:int) -> str:
+def _resolve_template_name(model:object, *, change_type:int) -> str:
     """
     Ginven an changed model instance and change type,
     return the preformated template name for it.
     """
-    ct = ContentType.objects.get_for_model(obj.__class__)
-
+    ct = ContentType.objects.get_for_model(model)
     # Resolve integer enum value from "change_type"
     # parameter to human readable string
     if change_type == HistoryType.create:
@@ -158,7 +166,6 @@ def _resolve_template_name(obj, *, change_type:int) -> str:
         change_type = "change"
     else:
         change_type = "delete"
-
     tmpl = "{app_label}/{model}-{change}"
     return tmpl.format(app_label=ct.app_label,
                        model=ct.model,
@@ -178,19 +185,61 @@ def _make_template_mail(name:str):
     return cls()
 
 
-def send_notifications(obj, *, history, users):
+@transaction.atomic
+def send_notifications(obj, *, history):
+    key = make_key_from_model_object(obj)
+    owner = User.objects.get(pk=history.user["pk"])
+    notification, created = (HistoryChangeNotification.objects.select_for_update()
+                             .get_or_create(key=key,
+                                            owner=owner,
+                                            project=obj.project,
+                                            history_type = history.type))
+
+    notification.updated_datetime = timezone.now()
+    notification.save()
+    notification.history_entries.add(history)
+
+    # Get a complete list of notifiable users for current
+    # object and send the change notification to them.
+    notify_users = get_users_to_notify(obj, discard_users=[notification.owner])
+    for notify_user in notify_users:
+        notification.notify_users.add(notify_user)
+
+
+@transaction.atomic
+def send_sync_notifications(notification_id):
     """
-    Given changed instance, history entry and
+    Given changed instance, calculate the history entry and
     a complete list for users to notify, send
     email to all users.
     """
-    context = {"object": obj,
-               "changer": history.owner,
-               "comment": history.comment,
-               "changed_fields": history.values_diff}
 
-    template_name = _resolve_template_name(obj, change_type=history.type)
+    notification = HistoryChangeNotification.objects.select_for_update().get(pk=notification_id)
+    # If the las modification is too recent we ignore it
+    now = timezone.now()
+    time_diff = now - notification.updated_datetime
+    if time_diff.seconds < settings.CHANGE_NOTIFICATIONS_MIN_INTERVAL:
+        print(time_diff.seconds)
+        return
+
+    history_entries = tuple(notification.history_entries.all().order_by("created_at"))
+    obj, _ = get_last_snapshot_for_key(notification.key)
+
+    context = {"snapshot": obj.snapshot,
+               "project": notification.project,
+               "changer": notification.owner,
+               "history_entries": history_entries}
+
+    model = get_model_from_key(notification.key)
+    template_name = _resolve_template_name(model, change_type=notification.history_type)
     email = _make_template_mail(template_name)
 
-    for user in users:
+    for user in notification.notify_users.distinct():
         email.send(user.email, context)
+
+    notification.delete()
+
+
+def process_sync_notifications():
+    for notification in HistoryChangeNotification.objects.all():
+        send_sync_notifications(notification.pk)
diff --git a/taiga/projects/userstories/api.py b/taiga/projects/userstories/api.py
index f5648fec..c1120ff9 100644
--- a/taiga/projects/userstories/api.py
+++ b/taiga/projects/userstories/api.py
@@ -177,4 +177,3 @@ class UserStoryViewSet(OCCResourceMixin, HistoryResourceMixin, WatchedResourceMi
             self.send_notifications(self.object.generated_from_issue, history)
 
         return response
-

From 89b8dfdc636ece39a4205fa3a5bbb6b5d72ef6bd Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:02:46 +0100
Subject: [PATCH 03/10] Refactoring email templates for notifications

---
 .../emails/includes/fields_diff-html.jinja    |  4 +--
 .../issues/issue-change-body-html.jinja       | 26 ++++++++++---------
 .../issues/issue-change-body-text.jinja       | 24 +++++++++--------
 .../emails/issues/issue-change-subject.jinja  |  2 +-
 .../issues/issue-create-body-html.jinja       |  8 +++---
 .../issues/issue-create-body-text.jinja       |  8 +++---
 .../emails/issues/issue-create-subject.jinja  |  2 +-
 .../issues/issue-delete-body-html.jinja       |  4 +--
 .../issues/issue-delete-body-text.jinja       |  4 +--
 .../emails/issues/issue-delete-subject.jinja  |  2 +-
 .../milestone-change-body-html.jinja          | 24 +++++++++--------
 .../milestone-change-body-text.jinja          | 24 +++++++++--------
 .../milestones/milestone-change-subject.jinja |  2 +-
 .../milestone-create-body-html.jinja          |  8 +++---
 .../milestone-create-body-text.jinja          |  8 +++---
 .../milestones/milestone-create-subject.jinja |  2 +-
 .../milestone-delete-body-html.jinja          |  4 +--
 .../milestone-delete-body-text.jinja          |  4 +--
 .../milestones/milestone-delete-subject.jinja |  2 +-
 .../projects/project-change-body-html.jinja   | 22 +++++++++-------
 .../projects/project-change-body-text.jinja   | 25 +++++++++---------
 .../projects/project-change-subject.jinja     |  2 +-
 .../projects/project-create-body-html.jinja   |  8 +++---
 .../projects/project-create-body-text.jinja   |  6 ++---
 .../projects/project-create-subject.jinja     |  2 +-
 .../projects/project-delete-body-html.jinja   |  2 +-
 .../projects/project-delete-body-text.jinja   |  2 +-
 .../projects/project-delete-subject.jinja     |  2 +-
 .../emails/tasks/task-change-body-html.jinja  | 24 +++++++++--------
 .../emails/tasks/task-change-body-text.jinja  | 24 +++++++++--------
 .../emails/tasks/task-change-subject.jinja    |  2 +-
 .../emails/tasks/task-create-body-html.jinja  |  8 +++---
 .../emails/tasks/task-create-body-text.jinja  |  8 +++---
 .../emails/tasks/task-create-subject.jinja    |  2 +-
 .../emails/tasks/task-delete-body-html.jinja  |  4 +--
 .../emails/tasks/task-delete-body-text.jinja  |  4 +--
 .../emails/tasks/task-delete-subject.jinja    |  2 +-
 .../userstory-change-body-html.jinja          | 24 +++++++++--------
 .../userstory-change-body-text.jinja          | 24 +++++++++--------
 .../userstory-change-subject.jinja            |  2 +-
 .../userstory-create-body-html.jinja          |  8 +++---
 .../userstory-create-body-text.jinja          |  8 +++---
 .../userstory-create-subject.jinja            |  2 +-
 .../userstory-delete-body-html.jinja          |  4 +--
 .../userstory-delete-body-text.jinja          |  4 +--
 .../userstory-delete-subject.jinja            |  2 +-
 .../wiki/wikipage-change-body-html.jinja      | 24 +++++++++--------
 .../wiki/wikipage-change-body-text.jinja      | 24 +++++++++--------
 .../emails/wiki/wikipage-change-subject.jinja |  2 +-
 .../wiki/wikipage-create-body-html.jinja      |  8 +++---
 .../wiki/wikipage-create-body-text.jinja      |  8 +++---
 .../emails/wiki/wikipage-create-subject.jinja |  2 +-
 .../wiki/wikipage-delete-body-html.jinja      |  4 +--
 .../wiki/wikipage-delete-body-text.jinja      |  4 +--
 .../emails/wiki/wikipage-delete-subject.jinja |  2 +-
 55 files changed, 245 insertions(+), 222 deletions(-)

diff --git a/taiga/projects/history/templates/emails/includes/fields_diff-html.jinja b/taiga/projects/history/templates/emails/includes/fields_diff-html.jinja
index 049bf6cc..150269b7 100644
--- a/taiga/projects/history/templates/emails/includes/fields_diff-html.jinja
+++ b/taiga/projects/history/templates/emails/includes/fields_diff-html.jinja
@@ -99,12 +99,12 @@
     {# DESCRIPTIONS #}
         {% elif field_name in ["description_diff"] %}
                 <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>diff:</b> <i>{{ mdrender(object.project, values.1) }}</i>
+                    <b>diff:</b> <i>{{ mdrender(project, values.1) }}</i>
                 </dd>
     {# CONTENT #}
         {% elif field_name in ["content_diff"] %}
                 <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>diff:</b> <i>{{ mdrender(object.project, values.1) }}</i>
+                    <b>diff:</b> <i>{{ mdrender(project, values.1) }}</i>
                 </dd>
     {# ASSIGNED TO #}
         {% elif field_name == "assigned_to" %}
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja b/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
index 11ddedb5..0f517727 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
@@ -1,23 +1,25 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("issue", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View issue #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("issue", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View issue #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Issue #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Issue #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ mdrender(object.project, comment) }}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
-        </td>
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ mdrender(project, entry.comment) }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+                </td>
+            {% endfor %}
     </tr>
 </table>
 {% endblock %}
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-change-body-text.jinja b/taiga/projects/notifications/templates/emails/issues/issue-change-body-text.jinja
index a3dd43ba..efcd3214 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-change-body-text.jinja
@@ -1,15 +1,17 @@
-{% set final_url = resolve_front_url("issue", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View issue #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("issue", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View issue #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- Issue #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- Issue #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% include "emails/includes/fields_diff-text.jinja" %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+    {% if changed_fields %}
+        {% include "emails/includes/fields_diff-text.jinja" %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-change-subject.jinja b/taiga/projects/notifications/templates/emails/issues/issue-change-subject.jinja
index 91d2a97f..e6f72cb8 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-change-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Updated the issue #{{ object.ref|safe }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Updated the issue #{{ snapshot.ref|safe }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-create-body-html.jinja b/taiga/projects/notifications/templates/emails/issues/issue-create-body-html.jinja
index 29dc64e5..5f6538b8 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-create-body-html.jinja
@@ -1,14 +1,14 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("issue", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View issue #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("issue", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View issue #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Issue #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Issue #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-create-body-text.jinja b/taiga/projects/notifications/templates/emails/issues/issue-create-body-text.jinja
index 257e41cf..f64a3176 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-create-body-text.jinja
@@ -1,8 +1,8 @@
-{% set final_url = resolve_front_url("issue", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View issue #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("issue", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View issue #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- US #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- US #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-create-subject.jinja b/taiga/projects/notifications/templates/emails/issues/issue-create-subject.jinja
index c88820da..93ea5b7d 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-create-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Created the issue #{{ object.ref|safe }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Created the issue #{{ snapshot.ref|safe }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/issues/issue-delete-body-html.jinja
index d25575a9..d9be80bc 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-delete-body-html.jinja
@@ -4,8 +4,8 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>{{ object.project.name }}</h1>
-            <h2>Issue #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>{{ project.name }}</h1>
+            <h2>Issue #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/issues/issue-delete-body-text.jinja
index 8bf2b9e9..e71c0580 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-delete-body-text.jinja
@@ -1,3 +1,3 @@
-- Project: {{ object.project.name }}
-- Issue #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- Issue #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/notifications/templates/emails/issues/issue-delete-subject.jinja b/taiga/projects/notifications/templates/emails/issues/issue-delete-subject.jinja
index e958318e..87d1c86a 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Deleted the issue #{{ object.ref|safe }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Deleted the issue #{{ snapshot.ref|safe }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-html.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-html.jinja
index ea456b34..898c8e78 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-html.jinja
@@ -1,22 +1,24 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("taskboard", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View milestone #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("taskboard", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View milestone #{0}".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Milestone #{{ object.slug }}: {{ object.name }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Milestone #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ entry.comment|linebreaksbr }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+            {% endfor %}
         </td>
     </tr>
 </table>
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-text.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-text.jinja
index c2f667d5..ff4f4ea2 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-change-body-text.jinja
@@ -1,15 +1,17 @@
-{% set final_url = resolve_front_url("taskboard", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View milestone #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("taskboard", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View milestone #{0}".format(snapshot.slug) %}
 
-- Project: {{ object.project.name }}
-- Milestone #{{ object.slug }}: {{ object.name }}
+- Project: {{ project.name }}
+- Milestone #{{ snapshot.slug }}: {{ snapshot.name }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% include "emails/includes/fields_diff-text.jinja" %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+    {% if changed_fields %}
+        {% include "emails/includes/fields_diff-text.jinja" %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-change-subject.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-change-subject.jinja
index e2b864e7..1249eb83 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-change-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Updated the milestone #{{ object.slug|safe }} "{{ object.name|safe }}"
+[{{ project.name|safe }}] Updated the milestone #{{ snapshot.slug|safe }} "{{ snapshot.name|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-html.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-html.jinja
index 1470717f..284e98b0 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-html.jinja
@@ -1,14 +1,14 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("taskboard", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View milestone #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("taskboard", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View milestone #{0}".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Milestone #{{ object.slug }}: {{ object.name }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Milestone #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-text.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-text.jinja
index a12024f9..300c8059 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-create-body-text.jinja
@@ -1,8 +1,8 @@
-{% set final_url = resolve_front_url("taskboard", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View milestone #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("taskboard", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View milestone #{0}".format(snapshot.slug) %}
 
-- Project: {{ object.project.name }}
-- Milestone #{{ object.slug }}: {{ object.name }}
+- Project: {{ project.name }}
+- Milestone #{{ snapshot.slug }}: {{ snapshot.name }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-create-subject.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-create-subject.jinja
index 176713df..28704d3e 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-create-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Created the milestone #{{ object.slug|safe }} "{{ object.name|safe }}"
+[{{ project.name|safe }}] Created the milestone #{{ snapshot.slug|safe }} "{{ snapshot.name|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-html.jinja
index d22cbdd4..20ac2a5d 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-html.jinja
@@ -4,8 +4,8 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>{{ object.project.name }}</h1>
-            <h2>Milestone #{{ object.slug }}: {{ object.name }}</h2>
+            <h1>{{ project.name }}</h1>
+            <h2>Milestone #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-text.jinja
index 9298a196..2916ae80 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-body-text.jinja
@@ -1,3 +1,3 @@
-- Project: {{ object.project.name }}
-- Milestone #{{ object.slug }}: {{ object.name }}
+- Project: {{ project.name }}
+- Milestone #{{ snapshot.slug }}: {{ snapshot.name }}
 - Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-subject.jinja b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-subject.jinja
index 6bf4b9cf..54221a8c 100644
--- a/taiga/projects/notifications/templates/emails/milestones/milestone-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/milestones/milestone-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Deleted the milestone #{{ object.slug|safe }} "{{ object.name|safe }}"
+[{{ project.name|safe }}] Deleted the milestone #{{ snapshot.slug|safe }} "{{ snapshot.name|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/projects/project-change-body-html.jinja b/taiga/projects/notifications/templates/emails/projects/project-change-body-html.jinja
index 39fe4f7e..0c65ef64 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-change-body-html.jinja
@@ -1,21 +1,23 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("project-admin", object.slug) %}
-{% set final_url_name = "Taiga - View Project #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("project-admin", snapshot.slug) %}
+{% set final_url_name = "Taiga - View Project #{0}".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h2>Project #{{ object.slug }}: {{ object.name }}</h2>
+            <h2>Project #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ entry.comment|linebreaksbr }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+            {% endfor %}
         </td>
     </tr>
 </table>
diff --git a/taiga/projects/notifications/templates/emails/projects/project-change-body-text.jinja b/taiga/projects/notifications/templates/emails/projects/project-change-body-text.jinja
index dfe93b9c..14fda13f 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-change-body-text.jinja
@@ -1,16 +1,17 @@
-{% set final_url = resolve_front_url("project-admin", object.slug) %}
-{% set final_url_name = "Taiga - View Project #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("project-admin", snapshot.slug) %}
+{% set final_url_name = "Taiga - View Project #{0}".format(snapshot.slug) %}
 
-- Project #{{ object.slug }}: {{ object.name }}
+- Project #{{ snapshot.slug }}: {{ snapshot.name }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% for field_name, values in changed_fields.items() %}
-    * {{ verbose_name(object, field_name) }}</b>: from '{{ values.0 }}' to '{{ values.1 }}'.
-    {% endfor %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+        {% for field_name, values in changed_fields.items() %}
+        * {{ verbose_name(object, field_name) }}</b>: from '{{ values.0 }}' to '{{ values.1 }}'.
+        {% endfor %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/projects/project-change-subject.jinja b/taiga/projects/notifications/templates/emails/projects/project-change-subject.jinja
index f2845743..25d9943b 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-change-subject.jinja
@@ -1 +1 @@
-[{{ object.name|safe }}] Updated the project #{{ object.slug|safe }}
+[{{ snapshot.name|safe }}] Updated the project #{{ snapshot.slug|safe }}
diff --git a/taiga/projects/notifications/templates/emails/projects/project-create-body-html.jinja b/taiga/projects/notifications/templates/emails/projects/project-create-body-html.jinja
index a45dbab3..a37f59c1 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-create-body-html.jinja
@@ -1,12 +1,12 @@
-{% set final_url = resolve_front_url("project-admin", object.slug) %}
-{% set final_url_name = "Taiga - View Project #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("project-admin", snapshot.slug) %}
+{% set final_url_name = "Taiga - View Project #{0}".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Project #{{ object.slug }}: {{ object.name }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Project #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/projects/project-create-body-text.jinja b/taiga/projects/notifications/templates/emails/projects/project-create-body-text.jinja
index af278212..c66430fc 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-create-body-text.jinja
@@ -1,7 +1,7 @@
-{% set final_url = resolve_front_url("project-admin", object.slug) %}
-{% set final_url_name = "Taiga - View Project #{0}".format(object.slug) %}
+{% set final_url = resolve_front_url("project-admin", snapshot.slug) %}
+{% set final_url_name = "Taiga - View Project #{0}".format(snapshot.slug) %}
 
-- Project #{{ object.slug }}: {{ object.name }}
+- Project #{{ snapshot.slug }}: {{ snapshot.name }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/projects/project-create-subject.jinja b/taiga/projects/notifications/templates/emails/projects/project-create-subject.jinja
index 82b06b70..06ed271b 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-create-subject.jinja
@@ -1 +1 @@
-[{{ object.name|safe }}] Created the project #{{ object.slug|safe }}
+[{{ snapshot.name|safe }}] Created the project #{{ snapshot.slug|safe }}
diff --git a/taiga/projects/notifications/templates/emails/projects/project-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/projects/project-delete-body-html.jinja
index 09448adc..2b8fa57d 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-delete-body-html.jinja
@@ -4,7 +4,7 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h2>Project #{{ object.slug }}: {{ object.name }}</h2>
+            <h2>Project #{{ snapshot.slug }}: {{ snapshot.name }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/projects/project-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/projects/project-delete-body-text.jinja
index 75d8013b..39935515 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-delete-body-text.jinja
@@ -1,2 +1,2 @@
-- Project #{{ object.slug }}: {{ object.name }}
+- Project #{{ snapshot.slug }}: {{ snapshot.name }}
 - Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/notifications/templates/emails/projects/project-delete-subject.jinja b/taiga/projects/notifications/templates/emails/projects/project-delete-subject.jinja
index 3caf2ac4..cf0adf31 100644
--- a/taiga/projects/notifications/templates/emails/projects/project-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/projects/project-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.name|safe }}] Deleted the project #{{ object.slug|safe }}
+[{{ snapshot.name|safe }}] Deleted the project #{{ snapshot.slug|safe }}
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-change-body-html.jinja b/taiga/projects/notifications/templates/emails/tasks/task-change-body-html.jinja
index 1a655513..02bfee38 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-change-body-html.jinja
@@ -1,22 +1,24 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("task", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View task #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("task", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View task #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Task #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Task #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ mdrender(object.project, comment) }}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ mdrender(project, entry.comment) }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+            {% endfor %}
         </td>
     </tr>
 </table>
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-change-body-text.jinja b/taiga/projects/notifications/templates/emails/tasks/task-change-body-text.jinja
index 771d1d94..925fbacc 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-change-body-text.jinja
@@ -1,15 +1,17 @@
-{% set final_url = resolve_front_url("task", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View task #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("task", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View task #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- Task #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- Task #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% include "emails/includes/fields_diff-text.jinja" %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+    {% if changed_fields %}
+        {% include "emails/includes/fields_diff-text.jinja" %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-change-subject.jinja b/taiga/projects/notifications/templates/emails/tasks/task-change-subject.jinja
index 1074e93b..ddd26e48 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-change-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Updated the task #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Updated the task #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-create-body-html.jinja b/taiga/projects/notifications/templates/emails/tasks/task-create-body-html.jinja
index e4122675..6d2a216e 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-create-body-html.jinja
@@ -1,14 +1,14 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("task", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View task #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("task", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View task #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Task #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Task #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-create-body-text.jinja b/taiga/projects/notifications/templates/emails/tasks/task-create-body-text.jinja
index 231473be..7ceca7fe 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-create-body-text.jinja
@@ -1,8 +1,8 @@
-{% set final_url = resolve_front_url("task", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View task #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("task", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View task #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- Task #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- Task #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-create-subject.jinja b/taiga/projects/notifications/templates/emails/tasks/task-create-subject.jinja
index 70c37be2..c83009d4 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-create-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Created the task #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Created the task #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/tasks/task-delete-body-html.jinja
index 008ff424..0186fa98 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-delete-body-html.jinja
@@ -4,8 +4,8 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>{{ object.project.name }}</h1>
-            <h2>Task #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>{{ project.name }}</h1>
+            <h2>Task #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/tasks/task-delete-body-text.jinja
index 22db8d90..8aa8d6ba 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-delete-body-text.jinja
@@ -1,4 +1,4 @@
-- Project: {{ object.project.name }}
-- Task #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- Task #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Deleted by {{ changer.get_full_name() }}
 
diff --git a/taiga/projects/notifications/templates/emails/tasks/task-delete-subject.jinja b/taiga/projects/notifications/templates/emails/tasks/task-delete-subject.jinja
index 00b8afc2..5a411013 100644
--- a/taiga/projects/notifications/templates/emails/tasks/task-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/tasks/task-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Deleted the task #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Deleted the task #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-html.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-html.jinja
index f73ad4e1..770ae1a0 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-html.jinja
@@ -1,22 +1,24 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("userstory", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View US #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("userstory", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View US #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>US #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>US #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ mdrender(object.project, comment)}}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ mdrender(project, entry.comment) }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+            {% endfor %}
         </td>
     </tr>
 </table>
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-text.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-text.jinja
index e796e9bc..95195b79 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-change-body-text.jinja
@@ -1,15 +1,17 @@
-{% set final_url = resolve_front_url("userstory", object.project.slug, object.ref)  %}
-{% set final_url_name = "Taiga - View US #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("userstory", project.slug, snapshot.ref)  %}
+{% set final_url_name = "Taiga - View US #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- US #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- US #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% include "emails/includes/fields_diff-text.jinja" %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+    {% if changed_fields %}
+        {% include "emails/includes/fields_diff-text.jinja" %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-change-subject.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-change-subject.jinja
index e1fe8bb4..5c66b14f 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-change-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Updated the US #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Updated the US #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-html.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-html.jinja
index 8e530f34..922aa86f 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-html.jinja
@@ -1,14 +1,14 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("userstory", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View US #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("userstory", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View US #{0}".format(snapshot.ref) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>US #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>US #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-text.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-text.jinja
index 4caa83a4..850d1d3a 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-create-body-text.jinja
@@ -1,8 +1,8 @@
-{% set final_url = resolve_front_url("userstory", object.project.slug, object.ref) %}
-{% set final_url_name = "Taiga - View US #{0}".format(object.ref) %}
+{% set final_url = resolve_front_url("userstory", project.slug, snapshot.ref) %}
+{% set final_url_name = "Taiga - View US #{0}".format(snapshot.ref) %}
 
-- Project: {{ object.project.name }}
-- US #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- US #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-create-subject.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-create-subject.jinja
index c17c460f..59f4b8db 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-create-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Created the US #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Created the US #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-html.jinja
index 549d786d..75d3c14d 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-html.jinja
@@ -4,8 +4,8 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>{{ object.project.name }}</h1>
-            <h2>US #{{ object.ref }}: {{ object.subject }}</h2>
+            <h1>{{ project.name }}</h1>
+            <h2>US #{{ snapshot.ref }}: {{ snapshot.subject }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-text.jinja
index 0dbb68b7..7ea708ce 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-body-text.jinja
@@ -1,3 +1,3 @@
-- Project: {{ object.project.name }}
-- US #{{ object.ref }}: {{ object.subject }}
+- Project: {{ project.name }}
+- US #{{ snapshot.ref }}: {{ snapshot.subject }}
 - Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-subject.jinja b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-subject.jinja
index 118117d7..1b315744 100644
--- a/taiga/projects/notifications/templates/emails/userstories/userstory-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/userstories/userstory-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Deleted the US #{{ object.ref }} "{{ object.subject|safe }}"
+[{{ project.name|safe }}] Deleted the US #{{ snapshot.ref }} "{{ snapshot.subject|safe }}"
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-html.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-html.jinja
index 3bde4285..c7694c4a 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-html.jinja
@@ -1,22 +1,24 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("wiki", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(object.slug) %}
+{% set final_url = resolve_front_url("wiki", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Wiki Page: {{ object.slug }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Wiki Page: {{ snapshot.slug }}</h2>
             <p>Updated by <b>{{ changer.get_full_name() }}</b>.</p>
-        {% if comment %}
-            <p>Comment <b>{{ mdrender(object.project, comment) }}</b></p>
-        {% endif %}
-        {% if changed_fields %}
-            <p>Updated fields:</p>
-            {% include "emails/includes/fields_diff-html.jinja" %}
-        {% endif %}
+            {% for entry in history_entries%}
+                {% if entry.comment %}
+                    <p>Comment <b>{{ mdrender(project, entry.comment) }}</b></p>
+                {% endif %}
+                {% set changed_fields = entry.values_diff %}
+                {% if changed_fields %}
+                    {% include "emails/includes/fields_diff-html.jinja" %}
+                {% endif %}
+            {% endfor %}
         </td>
     </tr>
 </table>
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-text.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-text.jinja
index b358d18f..50bc8d74 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-body-text.jinja
@@ -1,15 +1,17 @@
-{% set final_url = resolve_front_url("wiki", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(object.slug) %}
+{% set final_url = resolve_front_url("wiki", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(snapshot.slug) %}
 
-- Project: {{ object.project.name }}
-- Wiki Page: {{ object.slug }}
+- Project: {{ project.name }}
+- Wiki Page: {{ snapshot.slug }}
 - Updated by {{ changer.get_full_name() }}
-{% if comment %}
-Comment: {{ comment|linebreaksbr }}
-{% endif %}
-{% if changed_fields %}
-- Updated fields:
-    {% include "emails/includes/fields_diff-text.jinja" %}
-{% endif %}
+{% for entry in history_entries%}
+    {% if entry.comment %}
+    Comment: {{ entry.comment|linebreaksbr }}
+    {% endif %}
+    {% set changed_fields = entry.values_diff %}
+    {% if changed_fields %}
+        {% include "emails/includes/fields_diff-text.jinja" %}
+    {% endif %}
+{% endfor %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-subject.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-subject.jinja
index 18413c2d..024d566e 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-change-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-change-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Updated the Wiki Page "{{ object.slug }}"
+[{{ project.name|safe }}] Updated the Wiki Page "{{ snapshot.slug }}"
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-html.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-html.jinja
index 5eaf9f83..6112a0c5 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-html.jinja
@@ -1,14 +1,14 @@
 {% extends "emails/base.jinja" %}
 
-{% set final_url = resolve_front_url("wiki", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(object.slug) %}
+{% set final_url = resolve_front_url("wiki", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(snapshot.slug) %}
 
 {% block body %}
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>Project: {{ object.project.name }}</h1>
-            <h2>Wiki Page: {{ object.slug }}</h2>
+            <h1>Project: {{ project.name }}</h1>
+            <h2>Wiki Page: {{ snapshot.slug }}</h2>
             <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-text.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-text.jinja
index b41f4b8c..70bb34e9 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-body-text.jinja
@@ -1,8 +1,8 @@
-{% set final_url = resolve_front_url("wiki", object.project.slug, object.slug) %}
-{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(object.slug) %}
+{% set final_url = resolve_front_url("wiki", project.slug, snapshot.slug) %}
+{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(snapshot.slug) %}
 
-- Project: {{ object.project.name }}
-- Wiki Page: {{ object.slug }}
+- Project: {{ project.name }}
+- Wiki Page: {{ snapshot.slug }}
 - Created by {{ changer.get_full_name() }}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-subject.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-subject.jinja
index a32efed4..af4ca48d 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-create-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-create-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Created the Wiki Page "{{ object.slug }}"
+[{{ project.name|safe }}] Created the Wiki Page "{{ snapshot.slug }}"
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-html.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-html.jinja
index 6f9bc2ba..4e98c508 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-html.jinja
@@ -4,8 +4,8 @@
 <table border="0" width="100%" cellpadding="0" cellspacing="0" class="table-body">
     <tr>
         <td>
-            <h1>{{ object.project.name }}</h1>
-            <h2>Wiki Page: {{ object.slug }}</h2>
+            <h1>{{ project.name }}</h1>
+            <h2>Wiki Page: {{ snapshot.slug }}</h2>
             <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
         </td>
     </tr>
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-text.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-text.jinja
index e69b4559..d896f42f 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-text.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-body-text.jinja
@@ -1,3 +1,3 @@
-- Project: {{ object.project.name }}
-- Wiki Page: {{ object.slug }}
+- Project: {{ project.name }}
+- Wiki Page: {{ snapshot.slug }}
 - Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-subject.jinja b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-subject.jinja
index 7fd60924..a496edc2 100644
--- a/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-subject.jinja
+++ b/taiga/projects/notifications/templates/emails/wiki/wikipage-delete-subject.jinja
@@ -1 +1 @@
-[{{ object.project.name|safe }}] Deleted the Wiki Page "{{ object.slug }}"
+[{{ project.name|safe }}] Deleted the Wiki Page "{{ snapshot.slug }}"

From 6e313abfbd45d69dec21f44551a3d8b2dfdb5b82 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:03:20 +0100
Subject: [PATCH 04/10] Adding migrations

---
 .../0002_historychangenotification.py         | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 taiga/projects/notifications/migrations/0002_historychangenotification.py

diff --git a/taiga/projects/notifications/migrations/0002_historychangenotification.py b/taiga/projects/notifications/migrations/0002_historychangenotification.py
new file mode 100644
index 00000000..a8b92490
--- /dev/null
+++ b/taiga/projects/notifications/migrations/0002_historychangenotification.py
@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ('projects', '0005_membership_invitation_extra_text'),
+        ('history', '0004_historyentry_is_hidden'),
+        ('notifications', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='HistoryChangeNotification',
+            fields=[
+                ('id', models.AutoField(serialize=False, primary_key=True, verbose_name='ID', auto_created=True)),
+                ('key', models.CharField(max_length=255, editable=False)),
+                ('created_datetime', models.DateTimeField(verbose_name='created date time', auto_now_add=True)),
+                ('updated_datetime', models.DateTimeField(verbose_name='updated date time', auto_now_add=True)),
+                ('history_type', models.SmallIntegerField(choices=[(1, 'Change'), (2, 'Create'), (3, 'Delete')])),
+                ('history_entries', models.ManyToManyField(blank=True, null=True, to='history.HistoryEntry', verbose_name='history entries', related_name='+')),
+                ('notify_users', models.ManyToManyField(blank=True, null=True, to=settings.AUTH_USER_MODEL, verbose_name='notify users', related_name='+')),
+                ('owner', models.ForeignKey(related_name='+', to=settings.AUTH_USER_MODEL, verbose_name='owner')),
+                ('project', models.ForeignKey(related_name='+', to='projects.Project', verbose_name='project')),
+            ],
+            options={
+            },
+            bases=(models.Model,),
+        ),
+    ]

From 38fc63425a75badab8e58582383818ca0f475f02 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:03:33 +0100
Subject: [PATCH 05/10] Fixing tests

---
 tests/integration/test_notifications.py | 80 ++++++++++++++-----------
 1 file changed, 44 insertions(+), 36 deletions(-)

diff --git a/tests/integration/test_notifications.py b/tests/integration/test_notifications.py
index 411f67bd..f63ec656 100644
--- a/tests/integration/test_notifications.py
+++ b/tests/integration/test_notifications.py
@@ -22,15 +22,17 @@ from unittest.mock import MagicMock, patch
 from django.core.urlresolvers import reverse
 from django.apps import apps
 from .. import factories as f
+from .. utils import set_settings
 
 from taiga.projects.notifications import services
+from taiga.projects.notifications import models
 from taiga.projects.notifications.choices import NotifyLevel
 from taiga.projects.history.choices import HistoryType
+from taiga.projects.history.services import take_snapshot
 from taiga.projects.issues.serializers import IssueSerializer
 from taiga.projects.userstories.serializers import UserStorySerializer
 from taiga.projects.tasks.serializers import TaskSerializer
 
-
 pytestmark = pytest.mark.django_db
 
 
@@ -118,7 +120,7 @@ def test_users_to_notify():
     # Test basic description modifications
     issue.description = "test1"
     issue.save()
-    users = services.get_users_to_notify(issue, history=history)
+    users = services.get_users_to_notify(issue)
     assert len(users) == 1
     assert tuple(users)[0] == issue.get_owner()
 
@@ -126,13 +128,13 @@ def test_users_to_notify():
     policy1.notify_level = NotifyLevel.watch
     policy1.save()
 
-    users = services.get_users_to_notify(issue, history=history)
+    users = services.get_users_to_notify(issue)
     assert len(users) == 2
     assert users == {member1.user, issue.get_owner()}
 
     # Test with watchers
     issue.watchers.add(member3.user)
-    users = services.get_users_to_notify(issue, history=history)
+    users = services.get_users_to_notify(issue)
     assert len(users) == 3
     assert users == {member1.user, member3.user, issue.get_owner()}
 
@@ -141,90 +143,87 @@ def test_users_to_notify():
     policy3.save()
 
     issue.watchers.add(member3.user)
-    users = services.get_users_to_notify(issue, history=history)
+    users = services.get_users_to_notify(issue)
     assert len(users) == 2
     assert users == {member1.user, issue.get_owner()}
 
-
+@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=0)
 def test_send_notifications_using_services_method(mail):
     project = f.ProjectFactory.create()
     member1 = f.MembershipFactory.create(project=project)
     member2 = f.MembershipFactory.create(project=project)
 
     history_change = MagicMock()
-    history_change.owner = member1.user
+    history_change.user = {"pk": member1.user.pk}
     history_change.comment = ""
     history_change.type = HistoryType.change
 
     history_create = MagicMock()
-    history_create.owner = member1.user
+    history_create.user = {"pk": member1.user.pk}
     history_create.comment = ""
     history_create.type = HistoryType.create
 
     history_delete = MagicMock()
-    history_delete.owner = member1.user
+    history_delete.user = {"pk": member1.user.pk}
     history_delete.comment = ""
     history_delete.type = HistoryType.delete
 
     # Issues
     issue = f.IssueFactory.create(project=project)
+    take_snapshot(issue)
     services.send_notifications(issue,
-                                history=history_create,
-                                users={member1.user, member2.user})
+                                history=history_create)
 
     services.send_notifications(issue,
-                                history=history_change,
-                                users={member1.user, member2.user})
+                                history=history_change)
 
     services.send_notifications(issue,
-                                history=history_delete,
-                                users={member1.user, member2.user})
+                                history=history_delete)
+
 
     # Userstories
     us = f.UserStoryFactory.create()
+    take_snapshot(us)
     services.send_notifications(us,
-                                history=history_create,
-                                users={member1.user, member2.user})
+                                history=history_create)
 
     services.send_notifications(us,
-                                history=history_change,
-                                users={member1.user, member2.user})
+                                history=history_change)
 
     services.send_notifications(us,
-                                history=history_delete,
-                                users={member1.user, member2.user})
+                                history=history_delete)
+
     # Tasks
     task = f.TaskFactory.create()
+    take_snapshot(task)
     services.send_notifications(task,
-                                history=history_create,
-                                users={member1.user, member2.user})
+                                history=history_create)
 
     services.send_notifications(task,
-                                history=history_change,
-                                users={member1.user, member2.user})
+                                history=history_change)
 
     services.send_notifications(task,
-                                history=history_delete,
-                                users={member1.user, member2.user})
+                                history=history_delete)
 
     # Wiki pages
     wiki = f.WikiPageFactory.create()
+    take_snapshot(wiki)
     services.send_notifications(wiki,
-                                history=history_create,
-                                users={member1.user, member2.user})
+                                history=history_create)
 
     services.send_notifications(wiki,
-                                history=history_change,
-                                users={member1.user, member2.user})
+                                history=history_change)
 
     services.send_notifications(wiki,
-                                history=history_delete,
-                                users={member1.user, member2.user})
-
-    assert len(mail.outbox) == 24
+                                history=history_delete)
 
+    assert models.HistoryChangeNotification.objects.count() == 12
+    assert len(mail.outbox) == 0
+    services.process_sync_notifications()
 
+    assert len(mail.outbox) == 12
 
+@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=0)
 def test_resource_notification_test(client, mail):
     user1 = f.UserFactory.create()
     user2 = f.UserFactory.create()
@@ -242,13 +241,22 @@ def test_resource_notification_test(client, mail):
     with patch(mock_path) as m:
         data = {"subject": "Fooooo", "version": issue.version}
         response = client.patch(url, json.dumps(data), content_type="application/json")
-        assert len(mail.outbox) == 1
         assert response.status_code == 200
 
+        assert len(mail.outbox) == 0
+        assert models.HistoryChangeNotification.objects.count() == 1
+        services.process_sync_notifications()
+        assert len(mail.outbox) == 1
+        assert models.HistoryChangeNotification.objects.count() == 0
+
     with patch(mock_path) as m:
         response = client.delete(url)
         assert response.status_code == 204
+        assert len(mail.outbox) == 1
+        assert models.HistoryChangeNotification.objects.count() == 1
+        services.process_sync_notifications()
         assert len(mail.outbox) == 2
+        assert models.HistoryChangeNotification.objects.count() == 0
 
 
 def test_watchers_assignation_for_issue(client):

From 864734c97e3dd9b3d7a5264eb1c67cb5d2b7b45b Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:06:01 +0100
Subject: [PATCH 06/10] Adding managemente command for sending pending
 notifications

---
 .../management/commands/__init__.py           |  0
 .../management/commands/send_notifications.py | 27 +++++++++++++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 taiga/projects/notifications/management/commands/__init__.py
 create mode 100644 taiga/projects/notifications/management/commands/send_notifications.py

diff --git a/taiga/projects/notifications/management/commands/__init__.py b/taiga/projects/notifications/management/commands/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/taiga/projects/notifications/management/commands/send_notifications.py b/taiga/projects/notifications/management/commands/send_notifications.py
new file mode 100644
index 00000000..74c9bf31
--- /dev/null
+++ b/taiga/projects/notifications/management/commands/send_notifications.py
@@ -0,0 +1,27 @@
+# Copyright (C) 2014 Andrey Antukh <niwi@niwi.be>
+# Copyright (C) 2014 Jesús Espino <jespinog@gmail.com>
+# Copyright (C) 2014 David Barragán <bameda@dbarragan.com>
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+from django.core.management.base import BaseCommand
+
+from taiga.projects.notifications.models import HistoryChangeNotification
+from taiga.projects.notifications.services import send_sync_notifications
+
+class Command(BaseCommand):
+
+    def handle(self, *args, **options):
+        for change_notification in HistoryChangeNotification.objects.all():
+            send_sync_notifications(change_notification.pk)

From 08b8d478e1c8ce071ec695572049ff73a9755822 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 18:26:30 +0100
Subject: [PATCH 07/10] Making notifications work synchronously by default

---
 settings/common.py                       |  5 ++++-
 taiga/projects/notifications/services.py |  3 +++
 tests/integration/test_notifications.py  | 10 ++++++----
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/settings/common.py b/settings/common.py
index 3aef9bdf..fe66d2ba 100644
--- a/settings/common.py
+++ b/settings/common.py
@@ -332,7 +332,10 @@ TAGS_PREDEFINED_COLORS = ["#fce94f", "#edd400", "#c4a000", "#8ae234",
 FEEDBACK_ENABLED = True
 FEEDBACK_EMAIL = "support@taiga.io"
 
-CHANGE_NOTIFICATIONS_MIN_INTERVAL = 30 #seconds
+# 0 notifications will work in a synchronous way
+# >0 an external process will check the pending notifications and will send them
+# collapsed during that interval
+CHANGE_NOTIFICATIONS_MIN_INTERVAL = 0 #seconds
 
 # NOTE: DON'T INSERT MORE SETTINGS AFTER THIS LINE
 TEST_RUNNER="django.test.runner.DiscoverRunner"
diff --git a/taiga/projects/notifications/services.py b/taiga/projects/notifications/services.py
index 746beace..eac805e2 100644
--- a/taiga/projects/notifications/services.py
+++ b/taiga/projects/notifications/services.py
@@ -205,6 +205,9 @@ def send_notifications(obj, *, history):
     for notify_user in notify_users:
         notification.notify_users.add(notify_user)
 
+    # If we are the min interval is 0 it just work in a synchronous and spamming way
+    if settings.CHANGE_NOTIFICATIONS_MIN_INTERVAL == 0:
+        send_sync_notifications(notification.id)    
 
 @transaction.atomic
 def send_sync_notifications(notification_id):
diff --git a/tests/integration/test_notifications.py b/tests/integration/test_notifications.py
index f63ec656..da0e6bd4 100644
--- a/tests/integration/test_notifications.py
+++ b/tests/integration/test_notifications.py
@@ -17,6 +17,7 @@
 
 import json
 import pytest
+import time
 from unittest.mock import MagicMock, patch
 
 from django.core.urlresolvers import reverse
@@ -147,7 +148,7 @@ def test_users_to_notify():
     assert len(users) == 2
     assert users == {member1.user, issue.get_owner()}
 
-@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=0)
+@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=1)
 def test_send_notifications_using_services_method(mail):
     project = f.ProjectFactory.create()
     member1 = f.MembershipFactory.create(project=project)
@@ -219,11 +220,11 @@ def test_send_notifications_using_services_method(mail):
 
     assert models.HistoryChangeNotification.objects.count() == 12
     assert len(mail.outbox) == 0
+    time.sleep(1)
     services.process_sync_notifications()
-
     assert len(mail.outbox) == 12
 
-@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=0)
+@set_settings(CHANGE_NOTIFICATIONS_MIN_INTERVAL=1)
 def test_resource_notification_test(client, mail):
     user1 = f.UserFactory.create()
     user2 = f.UserFactory.create()
@@ -242,9 +243,9 @@ def test_resource_notification_test(client, mail):
         data = {"subject": "Fooooo", "version": issue.version}
         response = client.patch(url, json.dumps(data), content_type="application/json")
         assert response.status_code == 200
-
         assert len(mail.outbox) == 0
         assert models.HistoryChangeNotification.objects.count() == 1
+        time.sleep(1)
         services.process_sync_notifications()
         assert len(mail.outbox) == 1
         assert models.HistoryChangeNotification.objects.count() == 0
@@ -254,6 +255,7 @@ def test_resource_notification_test(client, mail):
         assert response.status_code == 204
         assert len(mail.outbox) == 1
         assert models.HistoryChangeNotification.objects.count() == 1
+        time.sleep(1)
         services.process_sync_notifications()
         assert len(mail.outbox) == 2
         assert models.HistoryChangeNotification.objects.count() == 0

From fac330246b1ae6464b6a927f6efe6a73c442d98a Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Tue, 28 Oct 2014 22:07:17 +0100
Subject: [PATCH 08/10] Removing unnecesary print

---
 taiga/projects/notifications/services.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/taiga/projects/notifications/services.py b/taiga/projects/notifications/services.py
index eac805e2..ba08918e 100644
--- a/taiga/projects/notifications/services.py
+++ b/taiga/projects/notifications/services.py
@@ -207,7 +207,7 @@ def send_notifications(obj, *, history):
 
     # If we are the min interval is 0 it just work in a synchronous and spamming way
     if settings.CHANGE_NOTIFICATIONS_MIN_INTERVAL == 0:
-        send_sync_notifications(notification.id)    
+        send_sync_notifications(notification.id)
 
 @transaction.atomic
 def send_sync_notifications(notification_id):
@@ -222,7 +222,6 @@ def send_sync_notifications(notification_id):
     now = timezone.now()
     time_diff = now - notification.updated_datetime
     if time_diff.seconds < settings.CHANGE_NOTIFICATIONS_MIN_INTERVAL:
-        print(time_diff.seconds)
         return
 
     history_entries = tuple(notification.history_entries.all().order_by("created_at"))

From 50ceecb11545e787a777b87ab7642a320743e7a7 Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Wed, 29 Oct 2014 08:49:29 +0100
Subject: [PATCH 09/10] Fixing issue change body email notification template

---
 .../templates/emails/issues/issue-change-body-html.jinja        | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja b/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
index 0f517727..301f351b 100644
--- a/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
+++ b/taiga/projects/notifications/templates/emails/issues/issue-change-body-html.jinja
@@ -18,8 +18,8 @@
                 {% if changed_fields %}
                     {% include "emails/includes/fields_diff-html.jinja" %}
                 {% endif %}
-                </td>
             {% endfor %}
+        </td>
     </tr>
 </table>
 {% endblock %}

From 94a4708df7db63bc8dc454744739cee2d371714b Mon Sep 17 00:00:00 2001
From: Alejandro Alonso <alejandro.alonso@kaleidos.net>
Date: Wed, 29 Oct 2014 09:12:04 +0100
Subject: [PATCH 10/10] Using iterqueryset in management command

---
 .../notifications/management/commands/send_notifications.py   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/taiga/projects/notifications/management/commands/send_notifications.py b/taiga/projects/notifications/management/commands/send_notifications.py
index 74c9bf31..4f2e4643 100644
--- a/taiga/projects/notifications/management/commands/send_notifications.py
+++ b/taiga/projects/notifications/management/commands/send_notifications.py
@@ -17,11 +17,13 @@
 
 from django.core.management.base import BaseCommand
 
+from taiga.base.utils.iterators import iter_queryset
 from taiga.projects.notifications.models import HistoryChangeNotification
 from taiga.projects.notifications.services import send_sync_notifications
 
 class Command(BaseCommand):
 
     def handle(self, *args, **options):
-        for change_notification in HistoryChangeNotification.objects.all():
+        qs = HistoryChangeNotification.objects.all()
+        for change_notification in iter_queryset(qs, itersize=100):
             send_sync_notifications(change_notification.pk)