From 3b42821932aa856251fc02333c81a021ad0ecf96 Mon Sep 17 00:00:00 2001
From: Yume05-dev <266928269+Yume05-dev@users.noreply.github.com>
Date: Mon, 23 Mar 2026 12:59:41 -0400
Subject: [PATCH] refactor: raise clear ValueError when Depends receives a
 non-callable

---
 fastapi/params.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fastapi/params.py b/fastapi/params.py
index e8f2eb290d..42444dd0ea 100644
--- a/fastapi/params.py
+++ b/fastapi/params.py
@@ -748,6 +748,12 @@ class Depends:
     use_cache: bool = True
     scope: Literal["function", "request"] | None = None
 
+    def __post_init__(self) -> None:
+        if self.dependency is not None and not callable(self.dependency):
+            raise ValueError(
+                f"Dependency must be a callable (function, class, etc.). "
+                f"Received: {type(self.dependency).__name__}"
+            )
 
 @dataclass(frozen=True)
 class Security(Depends):