Compatibility with Pydantic Models

[napocornejo]

Pydantic has become increasingly popular in the python world, and API development is of particular interest. Many API's work based on json requests which are a natural serialization for pydantic. However there is currently no way to create the flask-restx models from pydantic models.

Ideally, decorators like:

api.marshal_with(model)
namespace.doc(model=model)

can accept pydantic models.

At the moment I create utilitarian functions that device the flask-restx models from the pydantic models. Given the popularity of Pydantic this would be ideal to come out of the box in flask-restx.

[MajorDallas]

I agree that it'd be nice to have direct compatibility with the decorators.

In the meantime, I've been using Pydantic models with flast_restx in production for over 4 years. I posted an example of how I'm doing it in an old issue: #59 (comment). It still works with Pydantic 2.12 (though the migration from 1.8 to 2 was not fun). There are some other examples and tips from other users--the whole thread is worth a read if you're trying to use anything besides flask-restx's built-in models. Should be enough to tide us over until the model system gets the refactor we've been hoping for.