Usage of the documented API for models _meta

cas_server/auth.py

@@ -369,8 +369,16 @@ class DjangoAuthUser(AuthUser):  # pragma: no cover
         """
         if self.user:
             attr = {}
-            for field in self.user._meta.fields:
-                attr[field.attname] = getattr(self.user, field.attname)
+            # _meta.get_fields() is from the new documented _meta interface in django 1.8
+            try:
+                field_names = [
+                    field.attname for field in self.user._meta.get_fields() if hasattr(field, "attname")
+                ]
+            # backward compatibility with django 1.7
+            except AttributeError:  # pragma: no cover (only used by django 1.7)
+                field_names = self.user._meta.get_all_field_names()
+            for name in field_names:
+                attr[name] = getattr(self.user, name)
             return attr
         else:
             return {}