FAST002 + B008 when using DI with FastAPI and Ruff

[TojikCZ]

Hi,
I am new to dependency_injector.
I am trying to use the FastAPI example code and ruff configured like so:

[tool.ruff.lint]
select = ["ALL"]
ignore = [
    "FIX", # ignore TODOs
    "TD",  # ignore TODOs syntax
    "D104",  # Missing docstring in public package (__init__.py)
    "D203",  # 1 blank line required before class docstring, incomp. with D211
    "D213",  # multi-line-summary-second-line D212

    # ruff warning, don't format these, conflicts with linter
    "COM812", # missing-trailing-comma
    "ISC001", # single-line-implicit-string-concatenation
]

I am getting B008 and FAST002

FastAPI dependency without `Annotated`
Do not perform function call `Depends` in argument defaults; instead, perform the call within the function, or read the default from a module-level singleton variable

Note: I cannot reproduce the FAST002 on the dependency_injector FastAPI basic example, just the B008 shows up.

Anyway, I tried doing this

"""FastAPI widh dependency_injector example."""
from typing import Annotated

from dependency_injector import containers, providers
from dependency_injector.wiring import Provide, inject
from fastapi import Depends, FastAPI, Response, status


class Service:
    """A mock service."""

    async def process(self) -> str:
        """Return 'OK'."""
        return "OK"


class Container(containers.DeclarativeContainer):
    """Container providing the mock Service."""

    service = providers.Factory(Service)


app = FastAPI()

@app.api_route("/")
@inject
async def index(
        response: Response,
        service: Annotated[Service, Depends(Provide[Container.service])]
) -> dict[str, str]:
    """Verify that the injection works."""
    result = await service.process()
    response.status_code = status.HTTP_200_OK
    return {"result": result}

container = Container()
container.wire(modules=[__name__])

Now ruff is happy, but DI breaks.

AttributeError: 'Provide' object has no attribute 'process'

I tried other variations, but nothing worked.

Is there a way to write this so ruff and mypy are happy, and DI continues to work?
Thank you

[ZipFile]

Hello. We've merged #721 just recently and haven't had a release yet, as it needs some docs and examples to be updated. I'll work on it this weekend, so stay tuned.

[TojikCZ]

Oh, awesome. Sorry for the dupe

[wadinj]

Any news to get a release containing #721 ?

[ZipFile]

We just released v4.46.0 with typing.Annotated support. @TojikCZ could you verify that it works for you?

[TojikCZ]

Woop 🎉
I will. I'm stuck setting up conftest for sqlalchemy async stuff, keeps closing the connection unexpectedly. Once i'm done with that, i will throw those Depends() calls out and test.