🐛 Fix using Annotated in routers or path operations decorated multiple times

[sharonyogev]

We need to deep clone the field_info to prevent ourself from mutating it. This allows multiple path or nested routers ,etc.

Should solve those discussions:
#9279
#9309
#9306

[github-actions]

📝 Docs preview for commit 49c965c at: https://642030d2e2f56d1fc2f7a3e6--fastapi.netlify.app

[sharonyogev]

For some reason, locally I need this to have 100% coverage
I can revert this to keep the PR cleaner if needed

[gitpushdashf]

pass never gets executed. I've found the same thing before.

Might client.websocket_connect("/itemsx/portal-gun") work, instead?

[github-actions]

📝 Docs preview for commit 069e485 at: https://64213563bf51d1544b1883b2--fastapi.netlify.app

[jhamman]

I ran into this issue today so decided to give this PR a test drive. Seems to solve the issue nicely. Thanks @sharonyogev!

[Darkheir]

This PR also fixed this issue on one of my projects !

[bkis]

Same here: This fixed the issue I had with Annotated and APIRouter endpoints:

`Query` default value cannot be set in `Annotated` for 'some_param'. Set the default value with `=` instead.

... although set up as

@router.get("/", ...)
async def some_function(
    some_param: Annotated[
        list[str],
        Query(description="This is some parameter"),
    ] = []
)  # ...

[VikalpRusia]

Please have it merge ASAP

[PotatoPope]

This solved my issue, great work!

[yezz123]

LGTM 👍🏻

[hochstibe]

As stated in the discussion (actually a real issue), this fix solves my problem

[nzig]

LGTM. This fixes a bug I introduced in #4871.

[JordanZimmitti]

This will fix my issue as well! Any idea when this can get merged in?

[jesse-r-s-hines]

A monkey patch workaround for until this gets merged:

fastapi_analyze_param = fastapi.dependencies.utils.analyze_param
def fastapi_analyze_param_monkey_patch(*, annotation, **kwargs):
    """
    Workaround for until fastapi!9315 is merged.
    This needs to be patched in before you import/call any APIRouters
    """
    from typing import Annotated, get_args, get_origin
    from copy import copy
    if get_origin(annotation) is Annotated:
        annotation = Annotated[tuple(copy(arg) for arg in get_args(annotation))]
    return fastapi_analyze_param(annotation = annotation, **kwargs)
fastapi.dependencies.utils.analyze_param = fastapi_analyze_param_monkey_patch

[github-actions]

📝 Docs preview for commit e11eb50 at: https://643840014d5e810cf59c606f--fastapi.netlify.app

[tiangolo]

Awesome, great job @sharonyogev! 🙇

Thanks everyone for the comments and for testing it locally to confirm that it solved it for you. 👏

This will be released in the next hour or so in FastAPI 0.95.1 🎉

[sharonyogev]

Thanks @tiangolo, glad I could help 😃