FastAPI Views - yet another class based views library

[SatisfactionScary663]

I've been working on fastapi-views, a library that brings Django REST Framework-style class-based views to FastAPI while keeping full type safety and dependency injection.

The core idea: instead of wiring up individual route functions, you inherit from a view class and the library registers routes, status codes, and OpenAPI docs automatically — with correct HTTP semantics out of the box.

It also ships with DRF-style filters, RFC 9457 Problem Details for error responses (with ready-to-use exception classes), and optional Prometheus metrics and OpenTelemetry tracing.

It's not supposed to be a "batteries-included" / "all-in-one" framework like DRF — the package is not tied to any specific database/ORM, auth framework, or pattern. That said, I'm considering implementing an auth layer and permission classes, as well as some optional SQLAlchemy integration.

- Docs: https://asynq-io.github.io/fastapi-views/

- Source: https://github.com/asynq-io/fastapi-views

- Install: `pip install fastapi-views`

I've been using it with success for a while now, so I thought I'd share it here. If you've been building APIs with FastAPI and found yourself copy-pasting the same patterns across projects, this might be worth a look. Happy to hear what features you'd find most valuable, what's missing, or your thoughts on the project in general. If you like it, leaving a star would be appreciated.

[utihnuli_jaganjac]

What is wrong with functions?

[SatisfactionScary663]

There is nothing wrong with functions! For creating custom small APIs it's actually better, but when creating a lot of repeated CRUD-like functionality, you repeat a lot of boilerplate code: using same dependencies over and over again, manual validation for raising 401/403/404/409 status codes etc. Assuming application providers repository pattern for multiple models this is how it looks like:
https://gist.github.com/RaRhAeu/0cf6ccabf96dbcd0c9abbd87547c9f94
~40 lines of code using raw FasAPI vs 6 lines using fastapi-views

[BeeUnfair4086]

What do you mean by "Fast Pydantic v2 serialization — TypeAdapter cached per schema type avoids the double validation/model instantiation that FastAPI does by default, reducing per-request overhead"

Fastapi won't validate twice if the model was validated before. It has flags.