From 3e93e805f630ddcb46f79be00c97dbe28d22b6d4 Mon Sep 17 00:00:00 2001
From: aayushbaluni <73417844+aayushbaluni@users.noreply.github.com>
Date: Tue, 17 Mar 2026 23:34:30 +0530
Subject: [PATCH] fix: resolve ForwardRef in get_typed_annotation for
 Annotated+Depends (#13056)

When using from __future__ import annotations with Annotated[Potato, Depends(...)],
the annotation can reach analyze_param as a ForwardRef. Previously only str was
resolved; ForwardRef was returned as-is, causing Depends to be missed and the
param to be treated as a Query param. This led to PydanticUserError during
OpenAPI schema generation.

Extend get_typed_annotation to also resolve ForwardRef before returning.
---
 fastapi/dependencies/utils.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fastapi/dependencies/utils.py b/fastapi/dependencies/utils.py
index 6b14dac8dc..e9064a04eb 100644
--- a/fastapi/dependencies/utils.py
+++ b/fastapi/dependencies/utils.py
@@ -245,6 +245,7 @@ def get_typed_signature(call: Callable[..., Any]) -> inspect.Signature:
 def get_typed_annotation(annotation: Any, globalns: dict[str, Any]) -> Any:
     if isinstance(annotation, str):
         annotation = ForwardRef(annotation)
+    if isinstance(annotation, ForwardRef):
         annotation = evaluate_forwardref(annotation, globalns, globalns)  # ty: ignore[deprecated]
         if annotation is type(None):
             return None