syntax: use _meta

djangoldp_circle/djangoldp_urls.py

@@ -7,8 +7,8 @@ from djangoldp.models import Model
 urlpatterns = [
     path('circles/joinable/', CirclesJoinableViewset.urls(model_prefix="circles-joinable",
         model=Circle,
-        lookup_field=Model.get_meta(Circle, 'lookup_field', 'pk'),
-        permission_classes=Model.get_meta(Circle, 'permission_classes', []),
-        fields=Model.get_meta(Circle, 'serializer_fields', []),
-        nested_fields=Model.get_meta(Circle, 'nested_fields', []))),
+        lookup_field=getattr(Circle._meta, 'lookup_field', 'pk'),
+        permission_classes=getattr(Circle._meta, 'permission_classes', []),
+        fields=getattr(Circle._meta, 'serializer_fields', []),
+        nested_fields=getattr(Circle._meta, 'nested_fields', []))),
 ]