Is it possible to create generic Links a.k.a. Links to unspecified models?

[martincpt]

I am attempting to implement generic Links or Links to unspecified models for logging purposes. Specifically, I need to save the entity that a user has either created or modified.

In MongoEngine, there is a generic reference field that allows the saving of a reference to any kind of model.

I have tried several approaches, but none have been successful so far:

1. Using a custom TypeVar

Entity = TypeVar(Entity, bound=Document)

class Log(Document):
    event: str
    entity: Link[Entity]

2. Using Document itself

class Log(Document):
    event: str
    entity: Link[Document]

3. Attempting without specifying the type

class Log(Document):
    event: str
    entity: Link

Unfortunately, none of these attempts have yielded the desired outcome. I am seeking guidance on how to resolve this issue and implement generic Links successfully.

Thank you for your assistance!
Any help or insights would be greatly appreciated.