fixed bits comparision for postgres compability

protector/managers.py

@@ -1,4 +1,4 @@
-from django.db import models
+from django.db import models, connection
 from django.apps import apps
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.auth import get_user_model
@@ -82,7 +82,8 @@ def by_ctype(self, group_type, roles=None):
             user=self.instance
         )
         if roles is not None:
-            utg_qset = utg_qset.extra(where=["roles & %s"], params=[roles])
+            rule = "roles & %s" if not connection.vendor == 'postgresql' else "(roles & %s)::boolean"
+            utg_qset = utg_qset.extra(where=[rule], params=[roles])
         return group_model.objects.filter(
             pk__in=utg_qset.values_list('group_id')
         )
@@ -140,7 +141,8 @@ def by_role(self, roles):
         if roles is None:
             links = links.filter(roles__isnull=True)
         else:
-            links = links.extra(where=["roles & %s"], params=[roles])
+            rule = "roles & %s" if not connection.vendor == 'postgresql' else "(roles & %s)::boolean"
+            links = links.extra(where=[rule], params=[roles])
         return get_user_model().objects.filter(id__in=links.values_list('user_id', flat=True))
 
 

protector/querysets.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 from copy import deepcopy
+from django.db import connection
 from django.db.models.query import QuerySet
 from django.db.models import F
 from django.apps import apps
@@ -25,10 +26,10 @@ def filter_by_permission(self, user, permission):
 class GenericUserToGroupQuerySet(QuerySet):
     def by_role(self, roles):
         utg_table_name = self.model._meta.db_table
-        return self.extra(
-            where=["{utg_table}.roles & %s".format(utg_table=utg_table_name)],
-            params=[roles]
-        )
+        rule = "{utg_table}.roles & %s".format(utg_table=utg_table_name)
+        if connection.vendor == 'postgresql':
+            rule = "({})::boolean".format(rule)
+        return self.extra(where=[rule], params=[roles])
 
     @check_responsible_reason
     def delete(self, **kwargs):