ruff/crates/ruff_linter/resources
Denys Kyslytsyn e677863787
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[fastapi] Avoid false positive for class dependencies (FAST003) (#18271)
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## Summary

Closes #17226.

This PR updates the `FAST003` rule to correctly handle [FastAPI class
dependencies](https://fastapi.tiangolo.com/tutorial/dependencies/classes-as-dependencies/).
Specifically, if a path parameter is declared in either:

- a `pydantic.BaseModel` used as a dependency, or  
- the `__init__` method of a class used as a dependency,  

then `FAST003` will no longer incorrectly report it as unused.

FastAPI allows a shortcut when using annotated class dependencies -
`Depends` can be called without arguments, e.g.:

```python
class MyParams(BaseModel):
    my_id: int

@router.get("/{my_id}")
def get_id(params: Annotated[MyParams, Depends()]): ...
```
This PR ensures that such usage is properly supported by the linter.

Note: Support for dataclasses is not included in this PR. Let me know if
you’d like it to be added.

## Test Plan

Added relevant test cases to the `FAST003.py` fixture.
2025-06-02 14:34:50 -04:00
..
test [fastapi] Avoid false positive for class dependencies (FAST003) (#18271) 2025-06-02 14:34:50 -04:00
__init__.py [pylint] (Re-)Implement import-private-name (C2701) (#9553) 2024-01-16 14:03:11 -05:00