Merge 31aa7cd5c8 into 1d434dec47

fastapi/dependencies/utils.py

@@ -780,7 +780,7 @@ def request_params_to_args(
                 )
         value = _get_multidict_value(field, received_params, alias=alias)
         if value is not None:
-            params_to_process[field.name] = value
+            params_to_process[field.alias] = value
         processed_keys.add(alias or field.alias)
         processed_keys.add(field.name)
 

tests/test_param_models.py

@@ -0,0 +1,77 @@
+from fastapi import FastAPI
+from fastapi.params import Body, Cookie, Form, Header, Query
+from fastapi.testclient import TestClient
+from pydantic import BaseModel, Field
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class DataModel(BaseModel):
+    foo: str = Field(alias="bar", default="default_foo")
+    bar: str = Field(alias="foo", default="default_bar")
+
+
+@app.post("/param/body")
+def post_param_body(data: Annotated[DataModel, Body()]):
+    return data
+
+
+@app.post("/param/form")
+def post_param_form(data: Annotated[DataModel, Form()]):
+    return data
+
+
+@app.post("/param/query")
+def post_param_query(data: Annotated[DataModel, Query()]):
+    return data
+
+
+@app.post("/param/cookies")
+def post_param_cookies(data: Annotated[DataModel, Cookie()]):
+    return data
+
+
+@app.post("/param/headers")
+def post_param_headers(data: Annotated[DataModel, Header()]):
+    return data
+
+
+client = TestClient(app)
+
+expected_json = {
+    "bar": "default_foo",
+    "foo": "set_foo",
+}
+
+
+def test_param_body_with_alias():
+    response = client.post("/param/body", json={"foo": "set_foo"})
+    assert response.status_code == 200, response.text
+    assert response.json() == expected_json
+
+
+def test_param_form_with_alias():
+    response = client.post("/param/form", data={"foo": "set_foo"})
+    assert response.status_code == 200, response.text
+    assert response.json() == expected_json
+
+
+def test_param_query_with_alias():
+    response = client.post("/param/query", params={"foo": "set_foo"})
+    assert response.status_code == 200, response.text
+    assert response.json() == expected_json
+
+
+def test_param_headers_with_alias():
+    response = client.post("/param/headers", headers={"foo": "set_foo"})
+    assert response.status_code == 200, response.text
+    assert response.json() == expected_json
+
+
+def test_param_cookies_with_alias():
+    with client as c:
+        c.cookies.set("foo", "set_foo")
+        response = c.post("/param/cookies")
+    assert response.status_code == 200, response.text
+    assert response.json() == expected_json