change accessible_accounts to not use unions to allow for all queryset operations to be performed.

qrtr_account/views.py

@@ -1,4 +1,5 @@
 from django.shortcuts import render
+from django.db.models import Q
 from rest_framework import viewsets, mixins
 from .models import Account, BankAccount, Institution, Transaction, Slice, Rule, SubscriptionPlan
 from rest_framework.permissions import IsAuthenticated
@@ -18,13 +19,19 @@ from allauth.socialaccount.providers.twitter.views import TwitterOAuthAdapter
 from dj_rest_auth.social_serializers import TwitterLoginSerializer
 from api.mixins import ReadWriteSerializerMixin
 
+
 class OwnedAccountsMixin():
+    """Mixin to help getting a list of accounts
+    the given user is authorized to see
+    """
 
     def accessible_accounts(self):
         usr = self.request.user
-        return usr.owned_accounts.all()\
-            .union(usr.admin_accounts.all())\
-            .union(usr.view_accounts.all())
+        accs = Account.objects.filter(Q(owner=usr) |
+                                      Q(id__in=usr.admin_accounts.all().values_list('id')) |
+                                      Q(id__in=usr.view_accounts.all().values_list('id')))
+        return accs
+
 
 class TwitterLogin(SocialLoginView):
     serializer_class = TwitterLoginSerializer