apps/chat/tests/test_account_client.py

@@ -51,6 +51,12 @@ def test_get_users_public_info_bulk_fetches_and_caches(mock_get_client):
     assert result[str(user_2)]["avatar"] is None
     mock_httpx.request.assert_called_once()
 
+    # The accounts service's actual filter param is `uuid_in` (single
+    # underscore) — `uuid__in` (Django-ORM style) gets rejected with a 400.
+    requested_url = mock_httpx.request.call_args.kwargs["url"]
+    assert "uuid_in=" in requested_url
+    assert "uuid__in=" not in requested_url
+
     # Second call for the same UUIDs should be served entirely from cache.
     mock_get_client.reset_mock()
     result_again = accounts_client.get_users_public_info_bulk([user_1, user_2])

utils/clients/accounts_client.py

@@ -84,7 +84,7 @@ def get_users_public_info_bulk(uuids: list) -> dict[str, dict]:
         uuid_in = ",".join(str(u) for u in uncached)
         response = client.get_httpx_client().request(
             method="get",
-            url=f"/users/api/users/?uuid__in={uuid_in}",
+            url=f"/users/api/users/?uuid_in={uuid_in}",
         )
         if response.status_code == 200:
             for profile in response.json().get("results", []):