Summary

Hi,

I use FastAPI with a 'typical' structure: Pydantic schemas are converted to SQLAlchemy models.

For tests, currently, SQLAlchemy models are created in fixtures. Obviously, as the amount of models and validations grows, this doesn't scale. Therefore, I will use per-test objects created by factories.

polyfactory looks ideal, but one thing is missing: I would like to pass a Pydantic schema (PydanticFactory), then convert it to an SQLAlchemy model and create it, using a custom (CRUD layer) implementation.

Reason: Pydantic schemas validate business logic that should not be violated in tests (which happens by creating SQLAlchemy models with only data validation).

This looks relatively easy to implement by passing a custom handler to __sync_persistence__ on a factory (https://polyfactory.litestar.dev/latest/usage/configuration.html#persistence-handlers). (Still need to figure out how to subclass my factories from a base class so I don't have to repeat that...)

Instead of writing the implementation myself, would the maintainers be interested in adding a first-party supported example to the documentation? I could imagine this use case is quite common, as this is relevant for basically all larger FastAPI/Pydantic/SQLAlchemy projects.