Replace reversion middleware with api view mixin.

This is done because django 1.6 has transactions at view level and
current authentication is done at view level instead of using django auth
middleware.

greenmine/base/api.py

@@ -2,6 +2,7 @@
 
 from django.db import transaction
 
+from reversion.revisions import revision_context_manager
 from rest_framework import viewsets
 from rest_framework import status
 from rest_framework import mixins
@@ -79,7 +80,29 @@ class DetailAndListSerializersMixin(object):
         return super().get_serializer_class()
 
 
+class ReversionMixin(object):
+    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:
+            self._invalidare_revision()
+
+        revision_context_manager.end()
+        return response
+
+
 class ModelCrudViewSet(DetailAndListSerializersMixin,
+                       ReversionMixin,
                        PreconditionMixin,
                        HeadersPaginationMixin,
                        ConditionalPaginationMixin,
@@ -93,6 +116,7 @@ class ModelCrudViewSet(DetailAndListSerializersMixin,
 
 
 class ModelListViewSet(DetailAndListSerializersMixin,
+                       ReversionMixin,
                        PreconditionMixin,
                        HeadersPaginationMixin,
                        ConditionalPaginationMixin,

greenmine/settings/common.py

@@ -155,7 +155,6 @@ MIDDLEWARE_CLASSES = [
     'django.middleware.common.CommonMiddleware',
     'django.middleware.locale.LocaleMiddleware',
     'greenmine.base.middleware.CoorsMiddleware',
-    'reversion.middleware.RevisionMiddleware',
 
     # Only needed by django admin
     'django.contrib.sessions.middleware.SessionMiddleware',