pantheon-systems / ariadne-extensions Goto Github PK

While implementing Ariadne with Federation on top of my Flask Sqlalchemy app I have found an issue having my PublicUserNode shared with other services on my apollo federation setup. I kept getting this error:

Abstract type _Entity must resolve to an Object type at runtime for field Query._entities with value <User instance>, received 'None'. Either the _Entity type should provide a "resolve_type" function or each possible type should provide an "is_type_of" function.

The reason why I was getting it its because FederationManager._entity_type_resolver was looking for the type name either on the class name, which would not work in my case since my model class name is User and not PublicUserNode, or an AriadneMeta property which is undocumented.

My problem was solved by injecting AriadneMeta property into my model instance inside the federation object type's resolve_reference method, but I had to go through the source code to figure out what was missing.

I'd like to suggest to add it to the documentation and create a way to declare the type to be resolved, specially if you have multiple types to represent the same data class.