FilterSchema to take in arbitrary query parameters

[alekb-lennar]

Hi,

In the project I'm working on I have the following usecase. We have a metadata json field in a model and we have an API that returns its instances. We are utilizing the FilterSchema to filter by predefined attributes. My question and struggle is - can I also extend the FilterSchema to accept any attribute with the format metadata__* in the query parameters so that I can filter by it? So far I've tried overriding the init function, adding a pydantic root_validator and experimented with pydantic's extra fields but none seem to work as I expect.

Thanks in advance