Split Permission and StoredPermission class and model into different modules. Simplified the Permission class.

mayan/apps/document_indexing/api_views.py

@@ -8,7 +8,7 @@ from rest_framework import generics
 from acls.models import AccessEntry
 from documents.models import Document
 from documents.permissions import permission_document_view
-from permissions.models import Permission
+from permissions import Permission
 from rest_api.filters import MayanObjectPermissionsFilter
 from rest_api.permissions import MayanPermission
 
@@ -82,7 +82,7 @@ class APIIndexNodeInstanceDocumentListView(generics.ListAPIView):
     def get_queryset(self):
         index_node_instance = get_object_or_404(IndexInstanceNode, pk=self.kwargs['pk'])
         try:
-            Permission.objects.check_permissions(self.request.user, [permission_document_indexing_view])
+            Permission.check_permissions(self.request.user, [permission_document_indexing_view])
         except PermissionDenied:
             AccessEntry.objects.check_access(permission_document_indexing_view, self.request.user, index_node_instance.index)
 
@@ -142,7 +142,7 @@ class APIDocumentIndexListView(generics.ListAPIView):
     def get_queryset(self):
         document = get_object_or_404(Document, pk=self.kwargs['pk'])
         try:
-            Permission.objects.check_permissions(self.request.user, [permission_document_view])
+            Permission.check_permissions(self.request.user, [permission_document_view])
         except PermissionDenied:
             AccessEntry.objects.check_access(permission_document_view, self.request.user, document)