[LangGraph] AttributeError: 'coroutine' object has no attribute 'to_list'

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    • Type: Bug
    • Resolution: Done
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      As reported in https://github.com/langchain-ai/langchain-mongodb/issues/107, we introduced a bug in INTPYTHON-495.

        data = await app.aget_state(config)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".venv/lib/python3.13/site-packages/langgraph/pregel/__init__.py", line 1069, in aget_state
    saved = await checkpointer.aget_tuple(config)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "venv/lib/python3.13/site-packages/langgraph/checkpoint/mongodb/aio.py", line 163, in aget_tuple
    await self._setup()
  File ".venv/lib/python3.13/site-packages/langgraph/checkpoint/mongodb/aio.py", line 95, in _setup
    if len(await self.checkpoint_collection.list_indexes().to_list()) < 2:
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'coroutine' object has no attribute 'to_list'

            Assignee:
            Steve Silvester
            Reporter:
            Steve Silvester
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              Created:
              Updated:
              Resolved: