I spend some time going over this error but had no success. File "C:\Users\ebara.conda\envs\asci\lib\site-packages\fastapi\openapi\utils.py", line 388, in get_openapi flat_models=flat_models, model_name_map=model_name_map File "C:\Users\ebara.conda\envs\asci\lib\site-packages\fastapi\utils.py", line 28, in get_model_definitions model_name = model_name_map[model] KeyError: <class 'pydantic.main.Body_login_access_token_api_v1_login_access_token_post'> The problem is that I'm trying to build a project with user authentication from OpenAPI form to create new users in database. I've used backend part of this template project https://github.com/tiangolo/full-stack-fastapi-postgresql Everything works except for Authentication like here. @router.post("/login/access-token", response_model=schemas.Token) def login_access_token( db: Session = Depends(deps.get_db), form_data: OAuth2PasswordRequestForm = Depends()) -> Any: When I add this part form_data: OAuth2PasswordRequestForm = Depends() - and go to /docs page - this error appears (Failed to load API definition. Fetch error. Internal Server Error /openapi.json) . The server itself runs in normal mode, but it can't load the open API. If I remove the aforementioned formdata part - then everything works smoothly, but without Authorisation. I tried to debug it, but I have no success. I think it might be connected to a dependency graph or some start-up issues, but have no guess how to trace it back. Here is the full working example which will reproduce the error. The link points out the code which causes the problem. If you will comment out lines 18-39 - the docs will open without any problems. https://github.com/BEEugene/fastapi...fastapi_service/api/api_v1/endpoints/login.py Any ideas on how to debug or why this error happens? Continue reading...
