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✨ Allow using dependables withfunctools.partial()#9753

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d689b00
Rename tests/test_dependency_class.py -> tests/test_dependency_types.py
lieryanJan 22, 2024
57e1718
Add test for sync/async function/gen dependencies
lieryanJan 22, 2024
f16dd38
Add support for functools.partial()-wrapped dependables
lieryanJan 22, 2024
3ba104e
🎨 [pre-commit.ci] Auto format from pre-commit.com hooks
pre-commit-ci[bot]Jan 22, 2024
05ab699
Fix async_gen_dependency() should use yield; also fix type annotation
lieryanJan 22, 2024
b593e49
🎨 [pre-commit.ci] Auto format from pre-commit.com hooks
pre-commit-ci[bot]Jan 22, 2024
f20d338
Merge branch 'master' into lieryan-dependencies-with-functools-partial
YuriiMotovJun 24, 2025
a6e9c03
🎨 [pre-commit.ci] Auto format from pre-commit.com hooks
pre-commit-ci[bot]Jun 24, 2025
5407429
Merge remote-tracking branch 'upstream/master' into lieryan-dependenc…
YuriiMotovJul 6, 2025
9a434c4
Restore `test_dependency_class.py`
YuriiMotovJul 6, 2025
ce77af9
Clean up tests for partial dependencies and rename to `test_dependenc…
YuriiMotovJul 6, 2025
41d7016
🎨 [pre-commit.ci] Auto format from pre-commit.com hooks
pre-commit-ci[bot]Jul 6, 2025
53b67a2
Merge branch 'master' into lieryan-dependencies-with-functools-partial
YuriiMotovJul 10, 2025
0448ff1
Merge branch 'master' into lieryan-dependencies-with-functools-partial
YuriiMotovSep 20, 2025
d193739
Merge remote-tracking branch 'upstream/master' into lieryan-dependenc…
YuriiMotovNov 5, 2025
a5f1199
Remove unused import, make changes in `models.py`
YuriiMotovNov 5, 2025
c687deb
Merge branch 'master' into lieryan-dependencies-with-functools-partial
YuriiMotovDec 2, 2025
1202318
♻️ Move partial extraction logic to Dependant._unwrapped_call
tiangoloDec 2, 2025
d940395
♻️ Tweak tests to use Annotated for dependencies
tiangoloDec 2, 2025
128fdcc
Merge branch 'master' into lieryan-dependencies-with-functools-partial
tiangoloDec 2, 2025
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7 changes: 5 additions & 2 deletionsfastapi/dependencies/models.py
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Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
import inspect
import sys
from dataclasses import dataclass, field
from functools import cached_property
from functools import cached_property, partial
from typing import Any, Callable, List, Optional, Sequence, Union

from fastapi._compat import ModelField
Expand DownExpand Up@@ -79,7 +79,10 @@ def _uses_scopes(self) -> bool:
def _unwrapped_call(self) -> Any:
if self.call is None:
return self.call # pragma: no cover
return inspect.unwrap(self.call)
unwrapped = inspect.unwrap(self.call)
if isinstance(unwrapped, partial):
unwrapped = unwrapped.func
return unwrapped

@cached_property
def is_gen_callable(self) -> bool:
Expand Down
251 changes: 251 additions & 0 deletionstests/test_dependency_partial.py
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,251 @@
from functools import partial
from typing import AsyncGenerator, Generator

import pytest
from fastapi import Depends, FastAPI
from fastapi.testclient import TestClient
from typing_extensions import Annotated

app = FastAPI()


def function_dependency(value: str) -> str:
return value


async def async_function_dependency(value: str) -> str:
return value


def gen_dependency(value: str) -> Generator[str, None, None]:
yield value


async def async_gen_dependency(value: str) -> AsyncGenerator[str, None]:
yield value


class CallableDependency:
def __call__(self, value: str) -> str:
return value


class CallableGenDependency:
def __call__(self, value: str) -> Generator[str, None, None]:
yield value


class AsyncCallableDependency:
async def __call__(self, value: str) -> str:
return value


class AsyncCallableGenDependency:
async def __call__(self, value: str) -> AsyncGenerator[str, None]:
yield value


class MethodsDependency:
def synchronous(self, value: str) -> str:
return value

async def asynchronous(self, value: str) -> str:
return value

def synchronous_gen(self, value: str) -> Generator[str, None, None]:
yield value

async def asynchronous_gen(self, value: str) -> AsyncGenerator[str, None]:
yield value


callable_dependency = CallableDependency()
callable_gen_dependency = CallableGenDependency()
async_callable_dependency = AsyncCallableDependency()
async_callable_gen_dependency = AsyncCallableGenDependency()
methods_dependency = MethodsDependency()


@app.get("/partial-function-dependency")
async def get_partial_function_dependency(
value: Annotated[
str, Depends(partial(function_dependency, "partial-function-dependency"))
],
) -> str:
return value


@app.get("/partial-async-function-dependency")
async def get_partial_async_function_dependency(
value: Annotated[
str,
Depends(
partial(async_function_dependency, "partial-async-function-dependency")
),
],
) -> str:
return value


@app.get("/partial-gen-dependency")
async def get_partial_gen_dependency(
value: Annotated[str, Depends(partial(gen_dependency, "partial-gen-dependency"))],
) -> str:
return value


@app.get("/partial-async-gen-dependency")
async def get_partial_async_gen_dependency(
value: Annotated[
str, Depends(partial(async_gen_dependency, "partial-async-gen-dependency"))
],
) -> str:
return value


@app.get("/partial-callable-dependency")
async def get_partial_callable_dependency(
value: Annotated[
str, Depends(partial(callable_dependency, "partial-callable-dependency"))
],
) -> str:
return value


@app.get("/partial-callable-gen-dependency")
async def get_partial_callable_gen_dependency(
value: Annotated[
str,
Depends(partial(callable_gen_dependency, "partial-callable-gen-dependency")),
],
) -> str:
return value


@app.get("/partial-async-callable-dependency")
async def get_partial_async_callable_dependency(
value: Annotated[
str,
Depends(
partial(async_callable_dependency, "partial-async-callable-dependency")
),
],
) -> str:
return value


@app.get("/partial-async-callable-gen-dependency")
async def get_partial_async_callable_gen_dependency(
value: Annotated[
str,
Depends(
partial(
async_callable_gen_dependency, "partial-async-callable-gen-dependency"
)
),
],
) -> str:
return value


@app.get("/partial-synchronous-method-dependency")
async def get_partial_synchronous_method_dependency(
value: Annotated[
str,
Depends(
partial(
methods_dependency.synchronous, "partial-synchronous-method-dependency"
)
),
],
) -> str:
return value


@app.get("/partial-synchronous-method-gen-dependency")
async def get_partial_synchronous_method_gen_dependency(
value: Annotated[
str,
Depends(
partial(
methods_dependency.synchronous_gen,
"partial-synchronous-method-gen-dependency",
)
),
],
) -> str:
return value


@app.get("/partial-asynchronous-method-dependency")
async def get_partial_asynchronous_method_dependency(
value: Annotated[
str,
Depends(
partial(
methods_dependency.asynchronous,
"partial-asynchronous-method-dependency",
)
),
],
) -> str:
return value


@app.get("/partial-asynchronous-method-gen-dependency")
async def get_partial_asynchronous_method_gen_dependency(
value: Annotated[
str,
Depends(
partial(
methods_dependency.asynchronous_gen,
"partial-asynchronous-method-gen-dependency",
)
),
],
) -> str:
return value


client = TestClient(app)


@pytest.mark.parametrize(
"route,value",
[
("/partial-function-dependency", "partial-function-dependency"),
(
"/partial-async-function-dependency",
"partial-async-function-dependency",
),
("/partial-gen-dependency", "partial-gen-dependency"),
("/partial-async-gen-dependency", "partial-async-gen-dependency"),
("/partial-callable-dependency", "partial-callable-dependency"),
("/partial-callable-gen-dependency", "partial-callable-gen-dependency"),
("/partial-async-callable-dependency", "partial-async-callable-dependency"),
(
"/partial-async-callable-gen-dependency",
"partial-async-callable-gen-dependency",
),
(
"/partial-synchronous-method-dependency",
"partial-synchronous-method-dependency",
),
(
"/partial-synchronous-method-gen-dependency",
"partial-synchronous-method-gen-dependency",
),
(
"/partial-asynchronous-method-dependency",
"partial-asynchronous-method-dependency",
),
(
"/partial-asynchronous-method-gen-dependency",
"partial-asynchronous-method-gen-dependency",
),
],
)
def test_dependency_types_with_partial(route: str, value: str) -> None:
response = client.get(route)
assert response.status_code == 200, response.text
assert response.json() == value
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