Improve tag workflow actions with transactions

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/tags/workflow_actions.py

@@ -2,6 +2,7 @@ from __future__ import absolute_import, unicode_literals
 
 import logging
 
+from django.db import transaction
 from django.utils.translation import ugettext_lazy as _
 
 from mayan.apps.acls.models import AccessControlList
@@ -55,8 +56,13 @@ class AttachTagAction(WorkflowAction):
         return Tag.objects.filter(pk__in=self.form_data.get('tags', ()))
 
     def execute(self, context):
-        for tag in self.get_tags():
+        with transaction.atomic():
-            tag.attach_to(document=context['document'])
+            for tag in self.get_tags():
+                document = context['document']
+                queryset = document._meta.model._meta.default_manager.filter(
+                    pk=document.pk
+                )
+                tag.documents_attach(queryset=queryset)
 
 
 class RemoveTagAction(AttachTagAction):
@@ -74,4 +80,8 @@ class RemoveTagAction(AttachTagAction):
 
     def execute(self, context):
         for tag in self.get_tags():
-            tag.remove_from(document=context['document'])
+            document = context['document']
+            queryset = document._meta.model._meta.default_manager.filter(
+                pk=document.pk
+            )
+            tag.documents_attach(queryset=queryset)