fast_api_create_endpoint_fix.md

The function:

@lru_cache()
def movie_repository(settings: Settings = Depends(settings_instance)):
    """
    Movie repository instance to be used as a Fast API dependency.
    """
    return MongoMovieRepository(
        connection_string=settings.mongo_connection_string,
        database=settings.mongo_database_name,
    )

Will cause the following exception:

TypeError: unhashable type: 'Settings'

To fix the exception, please override hash function from Settings as so:

class Settings(BaseSettings):
    [...]
    def __hash__(self) -> int:
        return 1

The course bypasses the exception by using a closure function but that doesn't work as expected.