From 09eced41a01dd36cff9d2f5b067518c962c6c9bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Barrag=C3=A1n=20Merino?=
 <david.barragan@kaleidos.net>
Date: Fri, 9 May 2014 11:05:09 +0200
Subject: [PATCH] Update notifications to use the new history module

---
 taiga/base/api.py                             |  98 ---------------
 taiga/base/decorators.py                      |  27 ----
 taiga/base/notifications/api.py               |  51 --------
 taiga/base/serializers.py                     |  64 ----------
 taiga/front/__init__.py                       |   1 +
 taiga/projects/admin.py                       |   2 +-
 taiga/projects/issues/admin.py                |   4 +-
 taiga/projects/issues/api.py                  |  16 +--
 taiga/projects/issues/models.py               |   5 -
 taiga/projects/issues/serializers.py          |   2 +-
 .../update_issue_notification-body-html.jinja |  20 +--
 .../update_issue_notification-body-text.jinja |   4 +-
 taiga/projects/milestones/admin.py            |   3 +-
 taiga/projects/milestones/api.py              |   2 +-
 taiga/projects/milestones/models.py           |   7 +-
 taiga/projects/milestones/serializers.py      |   1 -
 ...ate_milestone_notification-body-html.jinja |  20 +--
 ...ate_milestone_notification-body-text.jinja |   4 +-
 taiga/projects/mixins/notifications.py        | 116 ++++++++++++++++++
 .../projects/mixins/notifications/__init__.py |   0
 .../mixins/notifications/serializers.py       |  42 -------
 taiga/projects/models.py                      |   3 -
 .../notifications/__init__.py                 |   0
 .../notifications/models.py                   |  75 +----------
 .../notifications/services.py                 |   0
 taiga/projects/tasks/admin.py                 |   2 +-
 taiga/projects/tasks/api.py                   |  29 +----
 taiga/projects/tasks/models.py                |   8 +-
 taiga/projects/tasks/services.py              |  41 +++++++
 .../update_task_notification-body-html.jinja  |  20 +--
 .../update_task_notification-body-text.jinja  |   4 +-
 taiga/projects/tasks/tests/tests_api.py       |  20 ---
 ...pdate_project_notification-body-html.jinja |  20 +--
 ...pdate_project_notification-body-text.jinja |   4 +-
 taiga/projects/userstories/admin.py           |   4 +-
 taiga/projects/userstories/api.py             |  30 +++--
 taiga/projects/userstories/models.py          |   7 +-
 taiga/projects/userstories/services.py        |   8 +-
 ...ate_userstory_notification-body-html.jinja |  20 +--
 ...ate_userstory_notification-body-text.jinja |   4 +-
 taiga/projects/userstories/tests/tests_api.py |   5 -
 taiga/projects/wiki/admin.py                  |   3 +-
 taiga/projects/wiki/api.py                    |  69 +++++------
 taiga/projects/wiki/models.py                 |   5 -
 .../create_wiki_notification-body-html.jinja  |  21 ++++
 .../create_wiki_notification-body-text.jinja  |   8 ++
 .../create_wiki_notification-subject.jinja    |   1 +
 .../destroy_wiki_notification-body-html.jinja |  13 ++
 .../destroy_wiki_notification-body-text.jinja |   3 +
 .../destroy_wiki_notification-subject.jinja   |   1 +
 .../update_wiki_notification-body-html.jinja  |  28 +++++
 .../update_wiki_notification-body-text.jinja  |  15 +++
 .../update_wiki_notification-subject.jinja    |   1 +
 taiga/users/models.py                         |   2 +-
 54 files changed, 345 insertions(+), 618 deletions(-)
 delete mode 100644 taiga/base/notifications/api.py
 create mode 100644 taiga/projects/mixins/notifications.py
 delete mode 100644 taiga/projects/mixins/notifications/__init__.py
 delete mode 100644 taiga/projects/mixins/notifications/serializers.py
 rename taiga/{base => projects}/notifications/__init__.py (100%)
 rename taiga/{base => projects}/notifications/models.py (57%)
 rename taiga/{base => projects}/notifications/services.py (100%)
 create mode 100644 taiga/projects/tasks/services.py
 create mode 100644 taiga/projects/wiki/templates/emails/create_wiki_notification-body-html.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/create_wiki_notification-body-text.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/create_wiki_notification-subject.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-html.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-text.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/destroy_wiki_notification-subject.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/update_wiki_notification-body-html.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/update_wiki_notification-body-text.jinja
 create mode 100644 taiga/projects/wiki/templates/emails/update_wiki_notification-subject.jinja

diff --git a/taiga/base/api.py b/taiga/base/api.py
index 87f1f7ba..572af4cc 100644
--- a/taiga/base/api.py
+++ b/taiga/base/api.py
@@ -15,23 +15,15 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-import reversion
-
 from django.db import transaction
 
 from rest_framework import viewsets
 from rest_framework import status
 from rest_framework import mixins
-from rest_framework import decorators as rf_decorators
 from rest_framework.response import Response
 
-from reversion.revisions import revision_context_manager
-from reversion.models import Version
-
-
 from . import pagination
 from . import serializers
-from . import decorators
 
 
 # Transactional version of rest framework mixins.
@@ -118,98 +110,9 @@ class DetailAndListSerializersMixin(object):
         return super().get_serializer_class()
 
 
-class ReversionMixin(object):
-    historical_model = Version
-    historical_serializer_class = serializers.VersionSerializer
-    historical_paginate_by = 5
-
-    def get_historical_queryset(self):
-        return reversion.get_unique_for_object(self.get_object())
-
-    def get_historical_serializer_class(self):
-        serializer_class = self.historical_serializer_class
-        if serializer_class is not None:
-            return serializer_class
-
-        assert self.historical_model is not None, \
-            "'%s' should either include a 'serializer_class' attribute, " \
-            "or use the 'model' attribute as a shortcut for " \
-            "automatically generating a serializer class." \
-            % self.__class__.__name__
-
-        class DefaultSerializer(self.model_serializer_class):
-            class Meta:
-                model = self.historical_model
-        return DefaultSerializer
-
-    def get_historical_serializer(self, instance=None, data=None, files=None,
-                                  many=False, partial=False):
-        serializer_class = self.get_historical_serializer_class()
-        return serializer_class(instance, data=data, files=files,
-                                many=many, partial=partial)
-
-    def get_historical_pagination_serializer(self, page):
-        return self.get_historical_serializer(page.object_list, many=True)
-
-    @rf_decorators.link()
-    @decorators.change_instance_attr("paginate_by", historical_paginate_by)
-    def historical(self, request, *args, **kwargs):
-        obj = self.get_object()
-
-        self.historical_object_list = self.get_historical_queryset()
-
-        # Switch between paginated or standard style responses
-        page = self.paginate_queryset(self.historical_object_list)
-        if page is not None:
-            serializer = self.get_historical_pagination_serializer(page)
-        else:
-            serializer = self.get_historical_serializer(self.historical_object_list,
-                                                        many=True)
-
-        return Response(serializer.data)
-
-    @rf_decorators.action()
-    def restore(self, request, *args, **kwargs):
-        vpk = request.QUERY_PARAMS.get("version", None)
-        if not vpk:
-            return Response(status=status.HTTP_404_NOT_FOUND)
-
-        try:
-            version = reversion.get_for_object(self.get_object()).get(pk=vpk)
-            version.revision.revert(delete=True)
-
-            serializer = self.get_serializer(self.get_object())
-            headers = self.get_success_headers(serializer.data)
-            return Response(serializer.data, status=status.HTTP_202_ACCEPTED,
-                            headers=headers)
-        except Version.DoesNotExist:
-            return Response(status=status.HTTP_400_BAD_REQUEST)
-
-    def dispatch(self, request, *args, **kwargs):
-        revision_context_manager.start()
-
-        try:
-            response = super().dispatch(request, *args, **kwargs)
-        except Exception as e:
-            revision_context_manager.invalidate()
-            revision_context_manager.end()
-            raise
-
-        if self.request.user.is_authenticated():
-            revision_context_manager.set_user(self.request.user)
-
-        if response.status_code > 206:
-            revision_context_manager.invalidate()
-
-        revision_context_manager.end()
-        return response
-
-
-
 # Own subclasses of django rest framework viewsets
 
 class ModelCrudViewSet(DetailAndListSerializersMixin,
-                       ReversionMixin,
                        PreconditionMixin,
                        pagination.HeadersPaginationMixin,
                        pagination.ConditionalPaginationMixin,
@@ -223,7 +126,6 @@ class ModelCrudViewSet(DetailAndListSerializersMixin,
 
 
 class ModelListViewSet(DetailAndListSerializersMixin,
-                       ReversionMixin,
                        PreconditionMixin,
                        pagination.HeadersPaginationMixin,
                        pagination.ConditionalPaginationMixin,
diff --git a/taiga/base/decorators.py b/taiga/base/decorators.py
index e143efca..20f27a15 100644
--- a/taiga/base/decorators.py
+++ b/taiga/base/decorators.py
@@ -14,35 +14,8 @@
 # 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 functools import wraps
 import warnings
 
-def change_instance_attr(name, new_value):
-    """
-    Change the attribute value temporarily for a new one. If it raise an AttributeError (if the
-    instance hasm't the attribute) the attribute will not be changed.
-    """
-    def change_instance_attr(fn):
-        @wraps(fn)
-        def wrapper(instance, *args, **kwargs):
-            try:
-                old_value = instance.__getattribute__(name)
-                changed = True
-            except AttributeError:
-                changed = False
-
-            if changed:
-                instance.__setattr__(name, new_value)
-
-            ret =  fn(instance, *args, **kwargs)
-
-            if changed:
-                instance.__setattr__(name, old_value)
-
-            return ret
-        return wrapper
-    return change_instance_attr
-
 
 ## Rest Framework 2.4 backport some decorators.
 
diff --git a/taiga/base/notifications/api.py b/taiga/base/notifications/api.py
deleted file mode 100644
index 3342bbaa..00000000
--- a/taiga/base/notifications/api.py
+++ /dev/null
@@ -1,51 +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 . import services
-
-
-class NotificationSenderMixin(object):
-    create_notification_template = None
-    update_notification_template = None
-    destroy_notification_template = None
-    notification_service = services.NotificationService()
-
-    def _post_save_notification_sender(self, obj, created=False):
-        users = obj.get_watchers_to_notify(self.request.user)
-        comment = self.request.DATA.get("comment", None)
-        context = {'changer': self.request.user, "comment": comment, 'object': obj}
-
-        if created:
-            self.notification_service.send_notification_email(self.create_notification_template,
-                                                              users=users, context=context)
-        else:
-            context["changed_fields"] = obj.get_changed_fields_list(self.request.DATA)
-            self.notification_service.send_notification_email(self.update_notification_template,
-                                                              users=users, context=context)
-
-    def post_save(self, obj, created=False):
-        super().post_save(obj, created)
-        self._post_save_notification_sender(obj, created)
-
-    def destroy(self, request, *args, **kwargs):
-        obj = self.get_object()
-        users = obj.get_watchers_to_notify(self.request.user)
-
-        context = {'changer': self.request.user, 'object': obj}
-        self.notification_service.send_notification_email(self.destroy_notification_template,
-                                                          users=users, context=context)
-
-        return super().destroy(request, *args, **kwargs)
diff --git a/taiga/base/serializers.py b/taiga/base/serializers.py
index 0ed59b4d..8e6d72b7 100644
--- a/taiga/base/serializers.py
+++ b/taiga/base/serializers.py
@@ -16,9 +16,6 @@
 
 from rest_framework import serializers
 
-from reversion.models import Version
-import reversion
-
 from taiga.domains.base import get_active_domain
 from taiga.domains.models import Domain
 
@@ -57,67 +54,6 @@ class AutoDomainField(serializers.WritableField):
         domain = get_active_domain()
         return domain
 
-class VersionSerializer(serializers.ModelSerializer):
-    created_date = serializers.SerializerMethodField("get_created_date")
-    content_type = serializers.SerializerMethodField("get_content_type")
-    object_id = serializers.SerializerMethodField("get_object_id")
-    user = serializers.SerializerMethodField("get_user")
-    comment = serializers.SerializerMethodField("get_comment")
-    fields = serializers.SerializerMethodField("get_object_fields")
-    changed_fields  = serializers.SerializerMethodField("get_changed_fields")
-
-    class Meta:
-        model = Version
-        fields = ("id", "created_date", "content_type", "object_id", "user", "comment",
-                  "fields", "changed_fields")
-        read_only = fields
-
-    def get_created_date(self, obj):
-        return obj.revision.date_created
-
-    def get_content_type(self, obj):
-        return obj.content_type.model
-
-    def get_object_id(self, obj):
-        return obj.object_id_int
-
-    def get_object_fields(self, obj):
-        return obj.field_dict
-
-    def get_user(self, obj):
-        return obj.revision.user.id if obj.revision.user else None
-
-    def get_comment(self, obj):
-        return obj.revision.comment
-
-    def get_object_old_fields(self, obj):
-        versions = reversion.get_unique_for_object(obj.object)
-        try:
-            return versions[versions.index(obj) + 1].field_dict
-        except IndexError:
-            return {}
-
-    def get_changed_fields(self, obj):
-        new_fields = self.get_object_fields(obj)
-        old_fields = self.get_object_old_fields(obj)
-
-        changed_fields = {}
-        for key in new_fields.keys() | old_fields.keys():
-            if key == "modified_date":
-                continue
-
-            if old_fields.get(key, "") == new_fields.get(key, ""):
-                continue
-
-            changed_fields[key] = {
-                 "name": obj.object.__class__._meta.get_field_by_name(
-                                                   key)[0].verbose_name,
-                 "old": old_fields.get(key, None),
-                 "new": new_fields.get(key, None),
-              }
-
-        return changed_fields
-
 
 class NeighborsSerializerMixin:
 
diff --git a/taiga/front/__init__.py b/taiga/front/__init__.py
index 85bcc02f..267fb543 100644
--- a/taiga/front/__init__.py
+++ b/taiga/front/__init__.py
@@ -27,6 +27,7 @@ URLS = {
     "project-admin": "/#/project/{0}/admin",
     "change-password": "/#/change-password/{0}",
     "invitation": "/#/invitation/{0}",
+    "wiki": "/#/project/{0}/wiki/{1}"
 }
 
 
diff --git a/taiga/projects/admin.py b/taiga/projects/admin.py
index 4d501bda..dda77a44 100644
--- a/taiga/projects/admin.py
+++ b/taiga/projects/admin.py
@@ -47,7 +47,7 @@ class MembershipInline(admin.TabularInline):
     extra = 0
 
 
-class ProjectAdmin(reversion.VersionAdmin):
+class ProjectAdmin(admin.ModelAdmin):
     list_display = ["name", "owner", "created_date", "total_milestones",
                     "total_story_points", "domain"]
     list_display_links = list_display
diff --git a/taiga/projects/issues/admin.py b/taiga/projects/issues/admin.py
index b0750268..562fbe09 100644
--- a/taiga/projects/issues/admin.py
+++ b/taiga/projects/issues/admin.py
@@ -20,10 +20,8 @@ from taiga.projects.admin import AttachmentInline
 
 from . import models
 
-import reversion
 
-
-class IssueAdmin(reversion.VersionAdmin):
+class IssueAdmin(admin.ModelAdmin):
     list_display = ["project", "milestone", "ref", "subject",]
     list_display_links = ["ref", "subject",]
     inlines = [AttachmentInline]
diff --git a/taiga/projects/issues/api.py b/taiga/projects/issues/api.py
index 0ed0de15..ffea1077 100644
--- a/taiga/projects/issues/api.py
+++ b/taiga/projects/issues/api.py
@@ -14,8 +14,6 @@
 # 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/>.
 
-import reversion
-from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext_lazy as _
 from django.db.models import Q
 
@@ -27,11 +25,12 @@ from rest_framework import filters
 from taiga.base import filters
 from taiga.base import exceptions as exc
 from taiga.base.decorators import list_route
-from taiga.base.api import ModelCrudViewSet, NeighborsApiMixin
-from taiga.base.notifications.api import NotificationSenderMixin
 from taiga.projects.permissions import AttachmentPermission
 from taiga.projects.serializers import AttachmentSerializer
 from taiga.projects.models import Attachment
+from taiga.base.api import ModelCrudViewSet
+from taiga.base.api import NeighborsApiMixin
+from taiga.projects.mixins.notifications import NotificationSenderMixin
 
 from . import models
 from . import permissions
@@ -142,15 +141,6 @@ class IssueViewSet(NeighborsApiMixin, NotificationSenderMixin, ModelCrudViewSet)
 
         if obj.type and obj.type.project != obj.project:
             raise exc.PermissionDenied(_("You don't have permissions for add/modify this issue."))
-
-    def post_save(self, obj, created=False):
-        with reversion.create_revision():
-            if "comment" in self.request.DATA:
-                # Update the comment in the last version
-                reversion.set_comment(self.request.DATA["comment"])
-        super().post_save(obj, created)
-
-
 class IssueAttachmentViewSet(ModelCrudViewSet):
     model = Attachment
     serializer_class = AttachmentSerializer
diff --git a/taiga/projects/issues/models.py b/taiga/projects/issues/models.py
index c6d406fe..e79e4499 100644
--- a/taiga/projects/issues/models.py
+++ b/taiga/projects/issues/models.py
@@ -28,7 +28,6 @@ from taiga.base.utils.slug import ref_uniquely
 from taiga.base.notifications.models import WatchedMixin
 from taiga.projects.mixins.blocked.models import BlockedMixin
 
-import reversion
 
 
 class Issue(NeighborsMixin, WatchedMixin, BlockedMixin):
@@ -276,10 +275,6 @@ class Issue(NeighborsMixin, WatchedMixin, BlockedMixin):
         }
 
 
-# Reversion registration (usufull for base.notification and for meke a historical)
-reversion.register(Issue)
-
-
 # Model related signals handlers
 @receiver(models.signals.pre_save, sender=Issue, dispatch_uid="issue_finished_date_handler")
 def issue_finished_date_handler(sender, instance, **kwargs):
diff --git a/taiga/projects/issues/serializers.py b/taiga/projects/issues/serializers.py
index ffd748bb..ed29c340 100644
--- a/taiga/projects/issues/serializers.py
+++ b/taiga/projects/issues/serializers.py
@@ -18,7 +18,7 @@ from rest_framework import serializers
 
 from taiga.base.serializers import PickleField, NeighborsSerializerMixin
 from taiga.projects.serializers import AttachmentSerializer
-from taiga.projects.mixins.notifications.serializers import WatcherValidationSerializerMixin
+from taiga.projects.mixins.notifications import WatcherValidationSerializerMixin
 
 from . import models
 
diff --git a/taiga/projects/issues/templates/emails/update_issue_notification-body-html.jinja b/taiga/projects/issues/templates/emails/update_issue_notification-body-html.jinja
index 096b8300..96d47378 100644
--- a/taiga/projects/issues/templates/emails/update_issue_notification-body-html.jinja
+++ b/taiga/projects/issues/templates/emails/update_issue_notification-body-html.jinja
@@ -14,24 +14,8 @@
             <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
         {% endif %}
         {% if changed_fields %}
-            <p>Updated fields:
-            <dl>
-            {% for field in changed_fields %}
-                <dt style="background: #669933; padding: 5px 15px; color: #fff">
-                    <b>{{ field.verbose_name}}</b>
-                </dt>
-                {% if field.new_value != None or field.new_value != "" %}
-                <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>to:</b> <i>{{ field.new_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-                {% if field.old_value != None or field.old_value != "" %}
-                <dd style="padding: 5px 15px; color: #bbb">
-                    <b>from:</b> <i>{{ field.old_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-            {% endfor %}
-            </dl>
+            <p>Updated fields:</p>
+            {% include "emails/includes/fields_diff-html.jinja" %}
         {% endif %}
         </td>
     </tr>
diff --git a/taiga/projects/issues/templates/emails/update_issue_notification-body-text.jinja b/taiga/projects/issues/templates/emails/update_issue_notification-body-text.jinja
index 5f68badb..a3dd43ba 100644
--- a/taiga/projects/issues/templates/emails/update_issue_notification-body-text.jinja
+++ b/taiga/projects/issues/templates/emails/update_issue_notification-body-text.jinja
@@ -9,9 +9,7 @@ Comment: {{ comment|linebreaksbr }}
 {% endif %}
 {% if changed_fields %}
 - Updated fields:
-    {% for field in changed_fields %}
-    * {{ field.verbose_name}}</b>: from '{{ field.old_value}}' to '{{ field.new_value }}'.
-    {% endfor %}
+    {% include "emails/includes/fields_diff-text.jinja" %}
 {% endif %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/milestones/admin.py b/taiga/projects/milestones/admin.py
index 3d2f096e..b741a1b2 100644
--- a/taiga/projects/milestones/admin.py
+++ b/taiga/projects/milestones/admin.py
@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.contrib import admin
-import reversion
 
 from . import models
 
@@ -25,7 +24,7 @@ class MilestoneInline(admin.TabularInline):
     extra = 0
 
 
-class MilestoneAdmin(reversion.VersionAdmin):
+class MilestoneAdmin(admin.ModelAdmin):
     list_display = ["name", "project", "owner", "closed", "estimated_start",
                     "estimated_finish"]
     list_display_links = list_display
diff --git a/taiga/projects/milestones/api.py b/taiga/projects/milestones/api.py
index 4a407ef4..b9dcb599 100644
--- a/taiga/projects/milestones/api.py
+++ b/taiga/projects/milestones/api.py
@@ -24,7 +24,7 @@ from taiga.base import filters
 from taiga.base import exceptions as exc
 from taiga.base.decorators import detail_route
 from taiga.base.api import ModelCrudViewSet
-from taiga.base.notifications.api import NotificationSenderMixin
+from taiga.projects.mixins.notifications import NotificationSenderMixin
 
 from . import serializers
 from . import models
diff --git a/taiga/projects/milestones/models.py b/taiga/projects/milestones/models.py
index 9c98135f..64651ada 100644
--- a/taiga/projects/milestones/models.py
+++ b/taiga/projects/milestones/models.py
@@ -20,11 +20,10 @@ from django.utils.translation import ugettext_lazy as _
 
 from taiga.base.utils.slug import slugify_uniquely
 from taiga.base.utils.dicts import dict_sum
-from taiga.base.notifications.models import WatchedMixin
+from taiga.projects.notifications.models import WatchedMixin
 
 from taiga.projects.userstories.models import UserStory
 
-import reversion
 import itertools
 import datetime
 
@@ -146,7 +145,3 @@ class Milestone(WatchedMixin, models.Model):
                 finish_date__lt=date + datetime.timedelta(days=1)
             ) if us.is_closed
         ])
-
-
-# Reversion registration (usufull for base.notification and for meke a historical)
-reversion.register(Milestone)
diff --git a/taiga/projects/milestones/serializers.py b/taiga/projects/milestones/serializers.py
index 8ff7547f..c82d90b9 100644
--- a/taiga/projects/milestones/serializers.py
+++ b/taiga/projects/milestones/serializers.py
@@ -15,7 +15,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import json
-import reversion
 
 from rest_framework import serializers
 
diff --git a/taiga/projects/milestones/templates/emails/update_milestone_notification-body-html.jinja b/taiga/projects/milestones/templates/emails/update_milestone_notification-body-html.jinja
index e5e80926..ea456b34 100644
--- a/taiga/projects/milestones/templates/emails/update_milestone_notification-body-html.jinja
+++ b/taiga/projects/milestones/templates/emails/update_milestone_notification-body-html.jinja
@@ -14,24 +14,8 @@
             <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
         {% endif %}
         {% if changed_fields %}
-            <p>Updated fields:
-            <dl>
-            {% for field in changed_fields %}
-                <dt style="background: #669933; padding: 5px 15px; color: #fff">
-                    <b>{{ field.verbose_name}}</b>
-                </dt>
-                {% if field.new_value != None or field.new_value != "" %}
-                <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>to:</b> <i>{{ field.new_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-                {% if field.old_value != None or field.old_value != "" %}
-                <dd style="padding: 5px 15px; color: #bbb">
-                    <b>from:</b> <i>{{ field.old_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-            {% endfor %}
-            </dl>
+            <p>Updated fields:</p>
+            {% include "emails/includes/fields_diff-html.jinja" %}
         {% endif %}
         </td>
     </tr>
diff --git a/taiga/projects/milestones/templates/emails/update_milestone_notification-body-text.jinja b/taiga/projects/milestones/templates/emails/update_milestone_notification-body-text.jinja
index 5f41acbf..c2f667d5 100644
--- a/taiga/projects/milestones/templates/emails/update_milestone_notification-body-text.jinja
+++ b/taiga/projects/milestones/templates/emails/update_milestone_notification-body-text.jinja
@@ -9,9 +9,7 @@ Comment: {{ comment|linebreaksbr }}
 {% endif %}
 {% if changed_fields %}
 - Updated fields:
-    {% for field in changed_fields %}
-    * {{ field.verbose_name}}</b>: from '{{ field.old_value}}' to '{{ field.new_value }}'.
-    {% endfor %}
+    {% include "emails/includes/fields_diff-text.jinja" %}
 {% endif %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/mixins/notifications.py b/taiga/projects/mixins/notifications.py
new file mode 100644
index 00000000..ef588cec
--- /dev/null
+++ b/taiga/projects/mixins/notifications.py
@@ -0,0 +1,116 @@
+# 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/>.
+
+
+#######
+# API #
+#######
+
+from taiga.projects.notifications import services
+from taiga.projects.history.services import take_snapshot
+from taiga.projects.history.models import HistoryType
+
+
+class NotificationSenderMixin(object):
+    create_notification_template = None
+    update_notification_template = None
+    destroy_notification_template = None
+    notification_service = services.NotificationService()
+
+    def _get_object_for_snapshot(self, obj):
+        return obj
+
+    def _post_save_notification_sender(self, obj, history):
+        users = obj.get_watchers_to_notify(history.owner)
+        context = {
+            "object": obj,
+            "changer": history.owner,
+            "comment": history.comment,
+            "changed_fields": history.values_diff
+        }
+
+        if history.type == HistoryType.create:
+            self.notification_service.send_notification_email(self.create_notification_template,
+                                                              users=users, context=context)
+        else:
+            self.notification_service.send_notification_email(self.update_notification_template,
+                                                              users=users, context=context)
+
+    def post_save(self, obj, created=False):
+        super().post_save(obj, created)
+
+        user = self.request.user
+        comment = self.request.DATA.get("comment", "")
+
+        obj = self._get_object_for_snapshot(obj)
+        history = take_snapshot(obj, comment=comment, user=user)
+
+        if history:
+            self._post_save_notification_sender(obj, history)
+
+    def pre_destroy(self, obj):
+        obj = self._get_object_for_snapshot(obj)
+        users = obj.get_watchers_to_notify(self.request.user)
+
+        context = {
+            "object": obj,
+            "changer": self.request.user
+        }
+        self.notification_service.send_notification_email(self.destroy_notification_template,
+                                                          users=users, context=context)
+    def post_destroy(self, obj):
+        pass
+
+    def destroy(self, request, *args, **kwargs):
+        obj = self.get_object()
+
+        self.pre_destroy(obj)
+        result = super().destroy(request, *args, **kwargs)
+        self.post_destroy(obj)
+
+        return result
+
+
+################
+# SERIEALIZERS #
+################
+
+from django.db.models.loading import get_model
+
+from rest_framework import serializers
+
+
+class WatcherValidationSerializerMixin(object):
+    def validate_watchers(self, attrs, source):
+        values =  set(attrs.get(source, []))
+        if values:
+            project = None
+            if "project" in attrs and attrs["project"]:
+                if self.object and attrs["project"] == self.object.project.id:
+                    project = self.object.project
+                else:
+                    project_model = get_model("projects", "Project")
+                    try:
+                        project = project_model.objects.get(project__id=attrs["project"])
+                    except project_model.DoesNotExist:
+                        pass
+            elif self.object:
+                project = self.object.project
+
+            if len(values) != get_model("projects", "Membership").objects.filter(project=project,
+                                                                                 user__in=values).count():
+                raise serializers.ValidationError("Error, some watcher user is not a member of the project")
+        return attrs
diff --git a/taiga/projects/mixins/notifications/__init__.py b/taiga/projects/mixins/notifications/__init__.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/taiga/projects/mixins/notifications/serializers.py b/taiga/projects/mixins/notifications/serializers.py
deleted file mode 100644
index c3a264e5..00000000
--- a/taiga/projects/mixins/notifications/serializers.py
+++ /dev/null
@@ -1,42 +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 django.db.models.loading import get_model
-
-from rest_framework import serializers
-
-
-class WatcherValidationSerializerMixin(object):
-    def validate_watchers(self, attrs, source):
-        values =  set(attrs.get(source, []))
-        if values:
-            project = None
-            if "project" in attrs and attrs["project"]:
-                if self.object and attrs["project"] == self.object.project.id:
-                    project = self.object.project
-                else:
-                    project_model = get_model("projects", "Project")
-                    try:
-                        project = project_model.objects.get(project__id=attrs["project"])
-                    except project_model.DoesNotExist:
-                        pass
-            elif self.object:
-                project = self.object.project
-
-            if len(values) != get_model("projects", "Membership").objects.filter(project=project,
-                                                                                 user__in=values).count():
-                raise serializers.ValidationError("Error, some watcher user is not a member of the project")
-        return attrs
diff --git a/taiga/projects/models.py b/taiga/projects/models.py
index c7992bdd..89bd3585 100644
--- a/taiga/projects/models.py
+++ b/taiga/projects/models.py
@@ -749,9 +749,6 @@ class ProjectTemplate(models.Model):
 
         return project
 
-# Reversion registration (usufull for base.notification and for meke a historical)
-reversion.register(Project)
-reversion.register(Attachment)
 
 # On membership object is created/changed, update
 # role-points relation.
diff --git a/taiga/base/notifications/__init__.py b/taiga/projects/notifications/__init__.py
similarity index 100%
rename from taiga/base/notifications/__init__.py
rename to taiga/projects/notifications/__init__.py
diff --git a/taiga/base/notifications/models.py b/taiga/projects/notifications/models.py
similarity index 57%
rename from taiga/base/notifications/models.py
rename to taiga/projects/notifications/models.py
index 14a3d414..f5fba223 100644
--- a/taiga/base/notifications/models.py
+++ b/taiga/projects/notifications/models.py
@@ -15,10 +15,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.db import models
-from django.db.models.fields import FieldDoesNotExist
 from django.utils.translation import ugettext_lazy as _
 
-import reversion
 
 
 class WatcherMixin(models.Model):
@@ -63,38 +61,8 @@ class WatcherMixin(models.Model):
     def allow_notify_project(self, project):
         return self.notify_level == "all_owned_projects"
 
-class WatchedMixin(models.Model):
-    notifiable_fields = []
-
-    class Meta:
-        abstract = True
-
-    @property
-    def last_version(self):
-        version_list = reversion.get_for_object(self)
-        return version_list and version_list[0] or None
-
-    def get_changed_fields_list(self, data_dict):
-        def _key_by_notifiable_field(item):
-            try:
-                return self.notifiable_fields.index(item["name"])
-            except ValueError:
-                return 100000 # Emulate the maximum value
-
-        if self.notifiable_fields:
-            changed_data = {k:v for k, v in data_dict.items()
-                                    if k in self.notifiable_fields}
-        else:
-            changed_data = data_dict
-
-        fields_list = []
-        for field_name, data_value in changed_data.items():
-            field_dict = self._get_changed_field(field_name, data_value)
-            if field_dict["old_value"] != field_dict["new_value"]:
-                fields_list.append(field_dict)
-
-        return sorted(fields_list, key=_key_by_notifiable_field)
 
+class WatchedMixin(object):
     def get_watchers_to_notify(self, changer):
         watchers_to_notify = set()
         watchers_by_role = self._get_watchers_by_role()
@@ -127,47 +95,6 @@ class WatchedMixin(models.Model):
 
         return watchers_to_notify
 
-    def _get_changed_field_verbose_name(self, field_name):
-        try:
-            return self._meta.get_field(field_name).verbose_name
-        except FieldDoesNotExist:
-            return field_name
-
-    def _get_changed_field_old_value(self, field_name, data_value):
-        value = (self.last_version.field_dict.get(field_name, data_value)
-                    if self.last_version else None)
-        field = self.__class__._meta.get_field_by_name(field_name)[0] or None
-
-        if value and field:
-            # Get the old value from a ForeignKey
-            if type(field) is models.fields.related.ForeignKey:
-                try:
-                    value = field.related.parent_model.objects.get(pk=value)
-                except field.related.parent_model.DoesNotExist:
-                    pass
-
-        display_method = getattr(self,"get_notifiable_{field_name}_display".format(
-                                                              field_name=field_name) ,None)
-        return display_method(value) if display_method else value
-
-    def _get_changed_field_new_value(self, field_name, data_value):
-        value = getattr(self, field_name, data_value)
-        display_method = getattr(self,"get_notifiable_{field_name}_display".format(
-                                                              field_name=field_name) ,None)
-        return display_method(value) if display_method else value
-
-    def _get_changed_field(self, field_name, data_value):
-        verbose_name = self._get_changed_field_verbose_name(field_name)
-        old_value = self._get_changed_field_old_value(field_name, None)
-        new_value = self._get_changed_field_new_value(field_name, data_value)
-
-        return {
-            "name": field_name,
-            "verbose_name": verbose_name,
-            "old_value": old_value,
-            "new_value": new_value,
-        }
-
     def _get_watchers_by_role(self):
         """
         Return the actual instances of watchers of this object, classified by role.
diff --git a/taiga/base/notifications/services.py b/taiga/projects/notifications/services.py
similarity index 100%
rename from taiga/base/notifications/services.py
rename to taiga/projects/notifications/services.py
diff --git a/taiga/projects/tasks/admin.py b/taiga/projects/tasks/admin.py
index c0e7fc08..5fb79345 100644
--- a/taiga/projects/tasks/admin.py
+++ b/taiga/projects/tasks/admin.py
@@ -21,7 +21,7 @@ from taiga.projects.admin import AttachmentInline
 from . import models
 
 
-class TaskAdmin(reversion.VersionAdmin):
+class TaskAdmin(admin.ModelAdmin):
     list_display = ["project", "milestone", "user_story",  "ref", "subject",]
     list_display_links = ["ref", "subject",]
     list_filter = ["project"]
diff --git a/taiga/projects/tasks/api.py b/taiga/projects/tasks/api.py
index 91364061..752ac9c5 100644
--- a/taiga/projects/tasks/api.py
+++ b/taiga/projects/tasks/api.py
@@ -27,19 +27,15 @@ from taiga.base import exceptions as exc
 from taiga.base.decorators import list_route
 from taiga.base.permissions import has_project_perm
 from taiga.base.api import ModelCrudViewSet
-from taiga.base.notifications.api import NotificationSenderMixin
 from taiga.projects.permissions import AttachmentPermission
 from taiga.projects.serializers import AttachmentSerializer
 from taiga.projects.models import Attachment, Project
+from taiga.projects.mixins.notifications import NotificationSenderMixin
 from taiga.projects.userstories.models import UserStory
 
 from . import models
 from . import permissions
 from . import serializers
-
-import reversion
-
-
 class TaskAttachmentViewSet(ModelCrudViewSet):
     model = Attachment
     serializer_class = AttachmentSerializer
@@ -66,6 +62,7 @@ class TaskAttachmentViewSet(ModelCrudViewSet):
                 obj.project.memberships.filter(user=self.request.user).count() == 0):
             raise exc.PermissionDenied(_("You don't have permissions for add "
                                          "attachments to this task."))
+from . import services
 
 
 class TaskViewSet(NotificationSenderMixin, ModelCrudViewSet):
@@ -102,13 +99,6 @@ class TaskViewSet(NotificationSenderMixin, ModelCrudViewSet):
         if obj.status and obj.status.project != obj.project:
             raise exc.PermissionDenied(_("You don't have permissions for add/modify this task."))
 
-    def post_save(self, obj, created=False):
-        with reversion.create_revision():
-            if "comment" in self.request.DATA:
-                # Update the comment in the last version
-                reversion.set_comment(self.request.DATA["comment"])
-        super().post_save(obj, created)
-
     @list_route(methods=["POST"])
     def bulk_create(self, request, **kwargs):
         bulk_tasks = request.DATA.get('bulkTasks', None)
@@ -124,21 +114,14 @@ class TaskViewSet(NotificationSenderMixin, ModelCrudViewSet):
             raise exc.BadRequest(_('usId parameter is mandatory'))
 
         project = get_object_or_404(Project, id=project_id)
-        us = get_object_or_404(UserStory, id=us_id)
+        user_story = get_object_or_404(UserStory, id=us_id)
 
         if request.user != project.owner and not has_project_perm(request.user, project, 'add_task'):
             raise exc.PermissionDenied(_("You don't have permisions to create tasks."))
 
-        items = filter(lambda s: len(s) > 0,
-                    map(lambda s: s.strip(), bulk_tasks.split("\n")))
-
-        tasks = []
-        for item in items:
-            obj = models.Task.objects.create(subject=item, project=project,
-                                             user_story=us, owner=request.user,
-                                             status=project.default_task_status)
-            tasks.append(obj)
-            self._post_save_notification_sender(obj, True)
+        service = services.TasksService()
+        tasks = service.bulk_insert(project, request.user, user_story, bulk_tasks,
+                                    callback_on_success=self.post_save)
 
         tasks_serialized = self.serializer_class(tasks, many=True)
         return Response(data=tasks_serialized.data)
diff --git a/taiga/projects/tasks/models.py b/taiga/projects/tasks/models.py
index adeb015a..b6e3566f 100644
--- a/taiga/projects/tasks/models.py
+++ b/taiga/projects/tasks/models.py
@@ -24,7 +24,7 @@ from django.utils.translation import ugettext_lazy as _
 from picklefield.fields import PickledObjectField
 
 from taiga.base.utils.slug import ref_uniquely
-from taiga.base.notifications.models import WatchedMixin
+from taiga.projects.notifications.models import WatchedMixin
 from taiga.projects.userstories.models import UserStory
 from taiga.projects.milestones.models import Milestone
 from taiga.projects.mixins.blocked.models import BlockedMixin
@@ -34,7 +34,7 @@ import reversion
 
 class Task(WatchedMixin, BlockedMixin):
     user_story = models.ForeignKey("userstories.UserStory", null=True, blank=True,
-                related_name="tasks", verbose_name=_("user story"))
+                                   related_name="tasks", verbose_name=_("user story"))
     ref = models.BigIntegerField(db_index=True, null=True, blank=True, default=None,
                                  verbose_name=_("ref"))
     owner = models.ForeignKey(settings.AUTH_USER_MODEL, null=True, blank=True, default=None,
@@ -109,10 +109,6 @@ class Task(WatchedMixin, BlockedMixin):
         }
 
 
-# Reversion registration (usufull for base.notification and for meke a historical)
-reversion.register(Task)
-
-
 # Model related signals handlers
 @receiver(models.signals.pre_save, sender=Task, dispatch_uid="task_ref_handler")
 def task_ref_handler(sender, instance, **kwargs):
diff --git a/taiga/projects/tasks/services.py b/taiga/projects/tasks/services.py
new file mode 100644
index 00000000..75f51fe0
--- /dev/null
+++ b/taiga/projects/tasks/services.py
@@ -0,0 +1,41 @@
+# 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.db import transaction
+from django.db import connection
+
+from . import models
+
+
+class TasksService(object):
+    @transaction.atomic
+    def bulk_insert(self, project, user, user_story, data, callback_on_success=None):
+        tasks = []
+
+        items = filter(lambda s: len(s) > 0,
+                    map(lambda s: s.strip(), data.split("\n")))
+
+        for item in items:
+            obj = models.Task.objects.create(subject=item, project=project,
+                                             user_story=user_story, owner=user,
+                                             status=project.default_task_status)
+            tasks.append(obj)
+
+            if callback_on_success:
+                callback_on_success(obj, True)
+
+        return tasks
+
diff --git a/taiga/projects/tasks/templates/emails/update_task_notification-body-html.jinja b/taiga/projects/tasks/templates/emails/update_task_notification-body-html.jinja
index 6a0d9bc6..c6e281a4 100644
--- a/taiga/projects/tasks/templates/emails/update_task_notification-body-html.jinja
+++ b/taiga/projects/tasks/templates/emails/update_task_notification-body-html.jinja
@@ -14,24 +14,8 @@
             <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
         {% endif %}
         {% if changed_fields %}
-            <p>Updated fields:
-            <dl>
-            {% for field in changed_fields %}
-                <dt style="background: #669933; padding: 5px 15px; color: #fff">
-                    <b>{{ field.verbose_name}}</b>
-                </dt>
-                {% if field.new_value != None or field.new_value != "" %}
-                <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>to:</b> <i>{{ field.new_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-                {% if field.old_value != None or field.old_value != "" %}
-                <dd style="padding: 5px 15px; color: #bbb">
-                    <b>from:</b> <i>{{ field.old_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-            {% endfor %}
-            </dl>
+            <p>Updated fields:</p>
+            {% include "emails/includes/fields_diff-html.jinja" %}
         {% endif %}
         </td>
     </tr>
diff --git a/taiga/projects/tasks/templates/emails/update_task_notification-body-text.jinja b/taiga/projects/tasks/templates/emails/update_task_notification-body-text.jinja
index c8181cfa..771d1d94 100644
--- a/taiga/projects/tasks/templates/emails/update_task_notification-body-text.jinja
+++ b/taiga/projects/tasks/templates/emails/update_task_notification-body-text.jinja
@@ -9,9 +9,7 @@ Comment: {{ comment|linebreaksbr }}
 {% endif %}
 {% if changed_fields %}
 - Updated fields:
-    {% for field in changed_fields %}
-    * {{ field.verbose_name}}</b>: from '{{ field.old_value}}' to '{{ field.new_value }}'.
-    {% endfor %}
+    {% include "emails/includes/fields_diff-text.jinja" %}
 {% endif %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/tasks/tests/tests_api.py b/taiga/projects/tasks/tests/tests_api.py
index 3ee56c6e..da80ae04 100644
--- a/taiga/projects/tasks/tests/tests_api.py
+++ b/taiga/projects/tasks/tests/tests_api.py
@@ -20,8 +20,6 @@ from django import test
 from django.core import mail
 from django.core.urlresolvers import reverse
 
-import reversion
-
 from taiga.users.tests import create_user
 from taiga.projects.tests import create_project, add_membership
 from taiga.projects.milestones.tests import create_milestone
@@ -111,24 +109,6 @@ class TasksTestCase(test.TestCase):
         response = self.client.get(reverse("tasks-detail", args=(self.task1.id,)))
         self.assertEqual(response.status_code, 401)
 
-    def test_view_task_by_project_owner(self):
-        response = self.client.login(username=self.user1.username,
-                                     password=self.user1.username)
-        self.assertTrue(response)
-
-        # Change task for generate history/diff.
-        with reversion.create_revision():
-            self.task1.tags = ["LL"]
-            self.task1.save()
-
-        with reversion.create_revision():
-            self.task1.tags = ["LLKK"]
-            self.task1.save()
-
-        response = self.client.get(reverse("tasks-detail", args=(self.task1.id,)))
-        self.assertEqual(response.status_code, 200)
-        self.client.logout()
-
     def test_view_task_by_owner(self):
         response = self.client.login(username=self.user2.username,
                                      password=self.user2.username)
diff --git a/taiga/projects/templates/emails/update_project_notification-body-html.jinja b/taiga/projects/templates/emails/update_project_notification-body-html.jinja
index c4012623..39fe4f7e 100644
--- a/taiga/projects/templates/emails/update_project_notification-body-html.jinja
+++ b/taiga/projects/templates/emails/update_project_notification-body-html.jinja
@@ -13,24 +13,8 @@
             <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
         {% endif %}
         {% if changed_fields %}
-            <p>Updated fields:
-            <dl>
-            {% for field in changed_fields %}
-                <dt style="background: #669933; padding: 5px 15px; color: #fff">
-                    <b>{{ field.verbose_name}}</b>
-                </dt>
-                {% if field.new_value != None or field.new_value != "" %}
-                <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>to:</b> <i>{{ field.new_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-                {% if field.old_value != None or field.old_value != "" %}
-                <dd style="padding: 5px 15px; color: #bbb">
-                    <b>from:</b> <i>{{ field.old_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-            {% endfor %}
-            </dl>
+            <p>Updated fields:</p>
+            {% include "emails/includes/fields_diff-html.jinja" %}
         {% endif %}
         </td>
     </tr>
diff --git a/taiga/projects/templates/emails/update_project_notification-body-text.jinja b/taiga/projects/templates/emails/update_project_notification-body-text.jinja
index cbe39067..dfe93b9c 100644
--- a/taiga/projects/templates/emails/update_project_notification-body-text.jinja
+++ b/taiga/projects/templates/emails/update_project_notification-body-text.jinja
@@ -8,8 +8,8 @@ Comment: {{ comment|linebreaksbr }}
 {% endif %}
 {% if changed_fields %}
 - Updated fields:
-    {% for field in changed_fields %}
-    * {{ field.verbose_name}}</b>: from '{{ field.old_value}}' to '{{ field.new_value }}'.
+    {% for field_name, values in changed_fields.items() %}
+    * {{ verbose_name(object, field_name) }}</b>: from '{{ values.0 }}' to '{{ values.1 }}'.
     {% endfor %}
 {% endif %}
 
diff --git a/taiga/projects/userstories/admin.py b/taiga/projects/userstories/admin.py
index 99385355..3e47aafa 100644
--- a/taiga/projects/userstories/admin.py
+++ b/taiga/projects/userstories/admin.py
@@ -15,14 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from django.contrib import admin
-import reversion
 
 from taiga.projects.admin import AttachmentInline
 
 from . import models
 
 
-
 class RolePointsInline(admin.TabularInline):
     model = models.RolePoints
     sortable_field_name = 'role'
@@ -39,7 +37,7 @@ class RolePointsAdmin(admin.ModelAdmin):
     readonly_fields = ["user_story", "role", "points"]
 
 
-class UserStoryAdmin(reversion.VersionAdmin):
+class UserStoryAdmin(admin.ModelAdmin):
     list_display = ["project", "milestone",  "ref", "subject",]
     list_display_links = ["ref", "subject",]
     list_filter = ["project"]
diff --git a/taiga/projects/userstories/api.py b/taiga/projects/userstories/api.py
index 7ebb0ff1..4392edf0 100644
--- a/taiga/projects/userstories/api.py
+++ b/taiga/projects/userstories/api.py
@@ -14,8 +14,6 @@
 # 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/>.
 
-import reversion
-
 from django.db import transaction
 from django.utils.translation import ugettext_lazy as _
 from django.contrib.contenttypes.models import ContentType
@@ -27,13 +25,16 @@ from rest_framework import status
 
 from taiga.base import filters
 from taiga.base import exceptions as exc
-from taiga.base.decorators import list_route, action
+from taiga.base.decorators import list_route
+from taiga.base.decorators import action
 from taiga.base.permissions import has_project_perm
-from taiga.base.api import ModelCrudViewSet, NeighborsApiMixin
-from taiga.base.notifications.api import NotificationSenderMixin
 from taiga.projects.permissions import AttachmentPermission
 from taiga.projects.serializers import AttachmentSerializer
 from taiga.projects.models import Attachment, Project
+from taiga.base.api import ModelCrudViewSet
+from taiga.base.api import NeighborsApiMixin
+from taiga.projects.mixins.notifications import NotificationSenderMixin
+from taiga.projects.history.services import take_snapshot
 
 from . import models
 from . import permissions
@@ -103,16 +104,19 @@ class UserStoryViewSet(NeighborsApiMixin, NotificationSenderMixin, ModelCrudView
             raise exc.PermissionDenied(_("You don't have permisions to create user stories."))
 
         service = services.UserStoriesService()
-        service.bulk_insert(project, request.user, bulk_stories,
-                            callback_on_success=self._post_save_notification_sender)
+        user_stories = service.bulk_insert(project, request.user, bulk_stories,
+                            callback_on_success=self.post_save)
 
-        return Response(data=None, status=status.HTTP_204_NO_CONTENT)
+        user_stories_serialized = self.serializer_class(user_stories, many=True)
+        return Response(data=user_stories_serialized.data)
 
     @list_route(methods=["POST"])
     def bulk_update_order(self, request, **kwargs):
         # bulkStories should be:
         # [[1,1],[23, 2], ...]
 
+        # TODO: Generate the histoy snaptshot when change the uss order in the backlog.
+        #       Implement order with linked lists \o/.
         bulk_stories = request.DATA.get("bulkStories", None)
 
         if bulk_stories is None:
@@ -138,10 +142,12 @@ class UserStoryViewSet(NeighborsApiMixin, NotificationSenderMixin, ModelCrudView
 
         # Added comment to the origin (issue)
         if response.status_code == status.HTTP_201_CREATED and self.object.generated_from_issue:
-            with reversion.create_revision():
-                reversion.set_comment(_("Generated the user story [US #{ref} - {subject}](:us:{ref} \"US #{ref} - {subject}\")").format(
-                                                                                        ref=self.object.ref, subject=self.object.subject))
-                self.object.generated_from_issue.save()
+            self.object.generated_from_issue.save()
+
+            comment = _("Generate the user story [US #{ref} - "
+                        "{subject}](:us:{ref} \"US #{ref} - {subject}\")")
+            comment = comment.format(ref=self.object.ref, subject=self.object.subject)
+            take_snapshot(self.object.generated_from_issue, comment=comment, user=self.request.user)
 
         return response
 
diff --git a/taiga/projects/userstories/models.py b/taiga/projects/userstories/models.py
index 659e5029..3d3b8287 100644
--- a/taiga/projects/userstories/models.py
+++ b/taiga/projects/userstories/models.py
@@ -21,12 +21,11 @@ from django.dispatch import receiver
 from django.utils.translation import ugettext_lazy as _
 
 from picklefield.fields import PickledObjectField
-import reversion
 
 from taiga.base.models import NeighborsMixin
 from taiga.base.utils.slug import ref_uniquely
-from taiga.base.notifications.models import WatchedMixin
 from taiga.projects.mixins.blocked.models import BlockedMixin
+from taiga.projects.notifications.models import WatchedMixin
 
 
 class RolePoints(models.Model):
@@ -177,10 +176,6 @@ class UserStory(NeighborsMixin, WatchedMixin, BlockedMixin, models.Model):
         }
 
 
-# Reversion registration (usufull for base.notification and for meke a historical)
-reversion.register(UserStory)
-
-
 # Model related signals handlers
 @receiver(models.signals.pre_save, sender=UserStory, dispatch_uid="user_story_ref_handler")
 def us_ref_handler(sender, instance, **kwargs):
diff --git a/taiga/projects/userstories/services.py b/taiga/projects/userstories/services.py
index 28137e9a..de1693da 100644
--- a/taiga/projects/userstories/services.py
+++ b/taiga/projects/userstories/services.py
@@ -18,23 +18,29 @@ from django.db import transaction
 from django.db import connection
 
 from . import models
-import reversion
 
 
 class UserStoriesService(object):
     @transaction.atomic
     def bulk_insert(self, project, user, data, callback_on_success=None):
+        user_stories = []
+
         items = filter(lambda s: len(s) > 0,
                     map(lambda s: s.strip(), data.split("\n")))
 
         for item in items:
             obj = models.UserStory.objects.create(subject=item, project=project, owner=user,
                                                   status=project.default_us_status)
+            user_stories.append(obj)
+
             if callback_on_success:
                 callback_on_success(obj, True)
 
+        return user_stories
+
     @transaction.atomic
     def bulk_update_order(self, project, user, data):
+        # TODO: Create a history snapshot of all updated USs
         cursor = connection.cursor()
 
         sql = """
diff --git a/taiga/projects/userstories/templates/emails/update_userstory_notification-body-html.jinja b/taiga/projects/userstories/templates/emails/update_userstory_notification-body-html.jinja
index 0ba75ab6..913525ae 100644
--- a/taiga/projects/userstories/templates/emails/update_userstory_notification-body-html.jinja
+++ b/taiga/projects/userstories/templates/emails/update_userstory_notification-body-html.jinja
@@ -14,24 +14,8 @@
             <p>Comment <b>{{ comment|linebreaksbr }}</b></p>
         {% endif %}
         {% if changed_fields %}
-            <p>Updated fields:
-            <dl>
-            {% for field in changed_fields %}
-                <dt style="background: #669933; padding: 5px 15px; color: #fff">
-                    <b>{{ field.verbose_name}}</b>
-                </dt>
-                {% if field.new_value != None or field.new_value != "" %}
-                <dd style="background: #eee; padding: 5px 15px; color: #444">
-                    <b>to:</b> <i>{{ field.new_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-                {% if field.old_value != None or field.old_value != "" %}
-                <dd style="padding: 5px 15px; color: #bbb">
-                    <b>from:</b> <i>{{ field.old_value|linebreaksbr }}</i>
-                </dd>
-                {% endif %}
-            {% endfor %}
-            </dl>
+            <p>Updated fields:</p>
+            {% include "emails/includes/fields_diff-html.jinja" %}
         {% endif %}
         </td>
     </tr>
diff --git a/taiga/projects/userstories/templates/emails/update_userstory_notification-body-text.jinja b/taiga/projects/userstories/templates/emails/update_userstory_notification-body-text.jinja
index 83a02d53..e796e9bc 100644
--- a/taiga/projects/userstories/templates/emails/update_userstory_notification-body-text.jinja
+++ b/taiga/projects/userstories/templates/emails/update_userstory_notification-body-text.jinja
@@ -9,9 +9,7 @@ Comment: {{ comment|linebreaksbr }}
 {% endif %}
 {% if changed_fields %}
 - Updated fields:
-    {% for field in changed_fields %}
-    * {{ field.verbose_name}}</b>: from '{{ field.old_value}}' to '{{ field.new_value }}'.
-    {% endfor %}
+    {% include "emails/includes/fields_diff-text.jinja" %}
 {% endif %}
 
 ** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/userstories/tests/tests_api.py b/taiga/projects/userstories/tests/tests_api.py
index fd3d56e4..8ec8d810 100644
--- a/taiga/projects/userstories/tests/tests_api.py
+++ b/taiga/projects/userstories/tests/tests_api.py
@@ -27,7 +27,6 @@ from taiga.projects.issues.tests import create_issue
 from . import create_userstory
 
 import json
-import reversion
 
 
 class UserStoriesTestCase(test.TestCase):
@@ -689,8 +688,6 @@ class UserStoriesTestCase(test.TestCase):
         self.assertEqual(len(mail.outbox), 2)
 
         self.assertEqual(response.data["origin_issue"]["subject"], issue.subject)
-        issue_historical = reversion.get_unique_for_object(issue)
-        self.assertTrue(data["subject"] in issue_historical[0].revision.comment)
 
         self.client.logout()
 
@@ -721,8 +718,6 @@ class UserStoriesTestCase(test.TestCase):
         self.assertEqual(len(mail.outbox), 2)
 
         self.assertEqual(response.data["origin_issue"]["subject"], issue.subject)
-        issue_historical = reversion.get_unique_for_object(issue)
-        self.assertTrue(data["subject"] in issue_historical[0].revision.comment)
 
         self.client.logout()
 
diff --git a/taiga/projects/wiki/admin.py b/taiga/projects/wiki/admin.py
index 6fc1e2cf..053cc8a7 100644
--- a/taiga/projects/wiki/admin.py
+++ b/taiga/projects/wiki/admin.py
@@ -16,8 +16,7 @@
 
 from django.contrib import admin
 
-from taiga.projects.wiki.models import WikiPage
-from taiga.projects.admin import AttachmentInline
+from taiga.projects.attachments.admin import AttachmentInline
 
 from . import models
 
diff --git a/taiga/projects/wiki/api.py b/taiga/projects/wiki/api.py
index 0d751497..2daba09d 100644
--- a/taiga/projects/wiki/api.py
+++ b/taiga/projects/wiki/api.py
@@ -14,60 +14,55 @@
 # 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.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext_lazy as _
-
 from rest_framework.permissions import IsAuthenticated
+from rest_framework.response import Response
+from rest_framework import status
 
 from taiga.base import filters
 from taiga.base import exceptions as exc
-from taiga.base.api import ModelCrudViewSet, ModelListViewSet
-from taiga.base.notifications.api import NotificationSenderMixin
-from taiga.projects.permissions import AttachmentPermission
-from taiga.projects.serializers import AttachmentSerializer
-from taiga.projects.models import Attachment
+from taiga.base.api import ModelCrudViewSet
+from taiga.base.decorators import list_route
+from taiga.projects.mixins.notifications import NotificationSenderMixin
+from taiga.projects.attachments.api import BaseAttachmentViewSet
+from taiga.projects.models import Project
+from taiga.mdrender.service import render as mdrender
 
 from . import models
 from . import permissions
 from . import serializers
 
 
-class WikiAttachmentViewSet(ModelCrudViewSet):
-    model = Attachment
-    serializer_class = AttachmentSerializer
-    permission_classes = (IsAuthenticated, AttachmentPermission)
-    filter_backends = (filters.IsProjectMemberFilterBackend,)
-    filter_fields = ["project", "object_id"]
-
-    def get_queryset(self):
-        ct = ContentType.objects.get_for_model(models.WikiPage)
-        qs = super().get_queryset()
-        qs = qs.filter(content_type=ct)
-        return qs.distinct()
-
-    def pre_conditions_on_save(self, obj):
-        super().pre_conditions_on_save(obj)
-
-        if (obj.project.owner != self.request.user and
-                obj.project.memberships.filter(user=self.request.user).count() == 0):
-            raise exc.PermissionDenied(_("You don't have permissions for add "
-                                         "attachments to this wiki page."))
-
-    def pre_save(self, obj):
-        if not obj.id:
-            obj.content_type = ContentType.objects.get_for_model(models.WikiPage)
-            obj.owner = self.request.user
-
-        super().pre_save(obj)
-
-
-class WikiViewSet(ModelCrudViewSet):
+class WikiViewSet(NotificationSenderMixin, ModelCrudViewSet):
     model = models.WikiPage
     serializer_class = serializers.WikiPageSerializer
     permission_classes = (IsAuthenticated,)
     filter_backends = (filters.IsProjectMemberFilterBackend,)
     filter_fields = ["project", "slug"]
 
+    create_notification_template = "create_wiki_notification"
+    update_notification_template = "update_wiki_notification"
+    destroy_notification_template = "destroy_wiki_notification"
+
+    @list_route(methods=["POST"])
+    def render(self, request, **kwargs):
+        content = request.DATA.get("content", None)
+        project_id = request.DATA.get("project_id", None)
+
+        if not content:
+            return Response({"content": "No content parameter"}, status=status.HTTP_400_BAD_REQUEST)
+        if not project_id:
+            return Response({"project_id": "No project_id parameter"}, status=status.HTTP_400_BAD_REQUEST)
+
+        try:
+            project = Project.objects.get(pk=project_id)
+        except Project.DoesNotExist:
+            return Response({"project_id": "Not valid project id"}, status=status.HTTP_400_BAD_REQUEST)
+
+        data = mdrender(project, content)
+
+        return Response({"data": data})
+
     def pre_conditions_on_save(self, obj):
         super().pre_conditions_on_save(obj)
 
diff --git a/taiga/projects/wiki/models.py b/taiga/projects/wiki/models.py
index e193783c..e521f13d 100644
--- a/taiga/projects/wiki/models.py
+++ b/taiga/projects/wiki/models.py
@@ -19,8 +19,6 @@ from django.contrib.contenttypes import generic
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 
-import reversion
-
 
 class WikiPage(models.Model):
     project = models.ForeignKey("projects.Project", null=False, blank=False,
@@ -51,6 +49,3 @@ class WikiPage(models.Model):
 
     def __str__(self):
         return "project {0} - {1}".format(self.project_id, self.slug)
-
-
-reversion.register(WikiPage)
diff --git a/taiga/projects/wiki/templates/emails/create_wiki_notification-body-html.jinja b/taiga/projects/wiki/templates/emails/create_wiki_notification-body-html.jinja
new file mode 100644
index 00000000..5eaf9f83
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/create_wiki_notification-body-html.jinja
@@ -0,0 +1,21 @@
+{% 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) %}
+
+{% 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>
+            <p>Created by <b>{{ changer.get_full_name() }}</b>.</p>
+        </td>
+    </tr>
+</table>
+{% endblock %}
+{% block footer %}
+<p style="padding: 10px; border-top: 1px solid #eee;">
+    More info at: <a href="{{ final_url }}" style="color: #666;">{{ final_url_name }}</a>
+</p>
+{% endblock %}
diff --git a/taiga/projects/wiki/templates/emails/create_wiki_notification-body-text.jinja b/taiga/projects/wiki/templates/emails/create_wiki_notification-body-text.jinja
new file mode 100644
index 00000000..b41f4b8c
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/create_wiki_notification-body-text.jinja
@@ -0,0 +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) %}
+
+- Project: {{ object.project.name }}
+- Wiki Page: {{ object.slug }}
+- Created by {{ changer.get_full_name() }}
+
+** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/wiki/templates/emails/create_wiki_notification-subject.jinja b/taiga/projects/wiki/templates/emails/create_wiki_notification-subject.jinja
new file mode 100644
index 00000000..a32efed4
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/create_wiki_notification-subject.jinja
@@ -0,0 +1 @@
+[{{ object.project.name|safe }}] Created the Wiki Page "{{ object.slug }}"
diff --git a/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-html.jinja b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-html.jinja
new file mode 100644
index 00000000..6f9bc2ba
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-html.jinja
@@ -0,0 +1,13 @@
+{% extends "emails/base.jinja" %}
+
+{% block body %}
+<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>
+            <p>Deleted by <b>{{ changer.get_full_name() }}</b></p>
+        </td>
+    </tr>
+</table>
+{% endblock %}
diff --git a/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-text.jinja b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-text.jinja
new file mode 100644
index 00000000..e69b4559
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-body-text.jinja
@@ -0,0 +1,3 @@
+- Project: {{ object.project.name }}
+- Wiki Page: {{ object.slug }}
+- Deleted by {{ changer.get_full_name() }}
diff --git a/taiga/projects/wiki/templates/emails/destroy_wiki_notification-subject.jinja b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-subject.jinja
new file mode 100644
index 00000000..7fd60924
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/destroy_wiki_notification-subject.jinja
@@ -0,0 +1 @@
+[{{ object.project.name|safe }}] Deleted the Wiki Page "{{ object.slug }}"
diff --git a/taiga/projects/wiki/templates/emails/update_wiki_notification-body-html.jinja b/taiga/projects/wiki/templates/emails/update_wiki_notification-body-html.jinja
new file mode 100644
index 00000000..89e3880d
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/update_wiki_notification-body-html.jinja
@@ -0,0 +1,28 @@
+{% 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) %}
+
+{% 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>
+            <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 %}
+        </td>
+    </tr>
+</table>
+{% endblock %}
+{% block footer %}
+<p style="padding: 10px; border-top: 1px solid #eee;">
+    More info at: <a href="{{ final_url }}" style="color: #666;">{{ final_url_name }}</a>
+</p>
+{% endblock %}
diff --git a/taiga/projects/wiki/templates/emails/update_wiki_notification-body-text.jinja b/taiga/projects/wiki/templates/emails/update_wiki_notification-body-text.jinja
new file mode 100644
index 00000000..b358d18f
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/update_wiki_notification-body-text.jinja
@@ -0,0 +1,15 @@
+{% set final_url = resolve_front_url("wiki", object.project.slug, object.slug) %}
+{% set final_url_name = "Taiga - View Wiki Page '{0}'".format(object.slug) %}
+
+- Project: {{ object.project.name }}
+- Wiki Page: {{ object.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 %}
+
+** More info at {{ final_url_name }} ({{ final_url }}) **
diff --git a/taiga/projects/wiki/templates/emails/update_wiki_notification-subject.jinja b/taiga/projects/wiki/templates/emails/update_wiki_notification-subject.jinja
new file mode 100644
index 00000000..18413c2d
--- /dev/null
+++ b/taiga/projects/wiki/templates/emails/update_wiki_notification-subject.jinja
@@ -0,0 +1 @@
+[{{ object.project.name|safe }}] Updated the Wiki Page "{{ object.slug }}"
diff --git a/taiga/users/models.py b/taiga/users/models.py
index e2915e49..15ef2261 100644
--- a/taiga/users/models.py
+++ b/taiga/users/models.py
@@ -20,7 +20,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.contrib.auth.models import UserManager, AbstractUser
 
 from taiga.base.utils.slug import slugify_uniquely
-from taiga.base.notifications.models import WatcherMixin
+from taiga.projects.notifications.models import WatcherMixin
 
 import random