Received incompatible instance \"<coroutine object get_batch_resolver.<locals>.resolve at 0x1080d6840>

[raguiar2]

When following the tutorial at https://docs.graphene-python.org/projects/sqlalchemy/en/latest/tutorial/ and using the following packages

asgiref==3.4.1
Flask==2.0.2
graphene==3.0
graphene-sqlalchemy==3.0.0b1
graphql-core==3.1.6
graphql-server[flask]==3.0.0b4
graphql-relay==3.1.0
uvicorn==0.16.0
gunicorn==20.1.0

to run an ASGI uvicorn server with flask (though it doesn't work if i just type flask run either), I execute the graphql command

{
  allEmployees {
    edges {
      node {
        id
        name
        department {
          name
        }
      }
    }
  }
}

And get a bunch of errors that say:
Received incompatible instance \"<coroutine object get_batch_resolver.<locals>.resolve at 0x1080d6840>

I looked deeper into it and it looks like the batch_load_fn in the batching.py file might not be awaited. Is this an error on the flask end? My code itself is exactly the same as the tutorials.

[erikwrede]

Was able to reproduce this issue in a similar case using FastAPI and graphene-starlette3. Seems to be non-breaking with regards to query resolution though.
Has anyone found any fix to that yet?

[erikwrede]

TODO: re-check with #169 merged, might be a suppressed underlying SQLAlchemy exception.

[erikwrede]

The graphene-SQLAlchemy part of this issue should be solved with the latest dataloader changes. To support async dataloaders, you need to make sure to use an asyncio-compatible server library such as starlettewith starlette-graphene3, or customize the flask GraphQLView of graphql-server to support an event loop.

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