Adding projects tags api action

greenmine/projects/aggregates/tags.py

@@ -0,0 +1,32 @@
+from contextlib import closing
+from django.db import connection
+
+def _get_issues_tags(project):
+    extra_sql = ("select unnest(unpickle(tags)) as tagname "
+                 "from issues_issue where project_id = %s "
+                 "group by unnest(unpickle(tags)) "
+                 "order by tagname asc")
+
+    with closing(connection.cursor()) as cursor:
+        cursor.execute(extra_sql, [project.id])
+        rows = cursor.fetchall()
+
+    return set([x[0] for x in rows])
+
+def _get_stories_tags(project):
+    extra_sql = ("select unnest(unpickle(tags)) as tagname, count(unnest(unpickle(tags))) "
+                 "from userstories_userstory where project_id = %s "
+                 "group by unnest(unpickle(tags)) "
+                 "order by tagname asc")
+
+    with closing(connection.cursor()) as cursor:
+        cursor.execute(extra_sql, [project.id])
+        rows = cursor.fetchall()
+
+    return set([x[0] for x in rows])
+
+def get_all_tags(project):
+    result = set()
+    result.update(_get_issues_tags(project))
+    result.update(_get_stories_tags(project))
+    return sorted(result)

greenmine/projects/api.py

@@ -9,6 +9,7 @@ from rest_framework.decorators import detail_route
 from greenmine.base import filters
 from greenmine.base.api import ModelCrudViewSet, ModelListViewSet
 from greenmine.base.notifications.api import NotificationSenderMixin
+from greenmine.projects.aggregates.tags import get_all_tags
 
 from . import serializers
 from . import models
@@ -39,6 +40,11 @@ class ProjectViewSet(ModelCrudViewSet):
         project = self.get_object()
         return Response(filters_aggr.get_issues_filters_data(project))
 
+    @detail_route(methods=['get'])
+    def tags(self, request, pk=None):
+        project = self.get_object()
+        return Response(get_all_tags(project))
+
     def get_queryset(self):
         qs = super(ProjectViewSet, self).get_queryset()
         qs = qs.filter(Q(owner=self.request.user) |