fixing rules backend error

rowers/backends.py

@@ -0,0 +1,14 @@
+from rules.permissions import ObjectPermissionBackend
+from rowers.models import User
+
+class MyObjectPermissionBackend(ObjectPermissionBackend):
+    def user_can_authenticate(self, user):
+        return getattr(user, "is_active", True)
+        
+    def get_user(self, user_id):
+        try:
+            user = User.objects.get(pk=user_id)
+        except User.DoesNotExist:
+            return None
+        return user if self.user_can_authenticate(user) else None
+