add validation schema openapi in testing and support to validation_alias in Form

fastapi/_compat.py

@@ -88,7 +88,7 @@ if PYDANTIC_V2:
 
         @property
         def alias(self) -> str:
-            a = self.field_info.alias
+            a = self.field_info.validation_alias or self.field_info.alias
             return a if a is not None else self.name
 
         @property
@@ -274,7 +274,7 @@ if PYDANTIC_V2:
         *, fields: Sequence[ModelField], model_name: str
     ) -> Type[BaseModel]:
         field_params = {
-            f"{f.field_info.alias}": (f.field_info.annotation, f.field_info)
+            f"{f.alias}": (f.field_info.annotation, f.field_info)
             for f in fields
         }
         BodyModel: Type[BaseModel] = create_model(model_name, **field_params)  # type: ignore[call-overload]

tests/test_alias_and_validation_alias_in_form.py

@@ -0,0 +1,47 @@
+from starlette.testclient import TestClient
+
+from fastapi import FastAPI, Form
+
+app: FastAPI = FastAPI()
+
+
+@app.post("/testing_alias")
+async def check_alias(id_test: int = Form(alias="otherId")):
+    return {"other_id": id_test}
+
+@app.post("/testing_validation_alias")
+async def check_validation_alias(id_test: int = Form(validation_alias="otherId")):
+    return {"other_id": id_test}
+
+
+client = TestClient(app)
+
+
+def test_get_alias():
+    response = client.post("/testing_alias", data={"otherId": "1"})
+    assert response.status_code == 200
+    assert response.json() == {"other_id": 1}
+
+def test_get_validation_alias():
+    response = client.post("/testing_validation_alias", data={"otherId": "1"})
+    assert response.status_code == 200
+    assert response.json() == {"other_id": 1}
+
+def test_file_alias_schema():
+    response = client.get("/openapi.json")
+    assert response.status_code == 200, response.text
+    schema = response.json()
+
+    assert (
+        "otherId"
+        in schema["components"]["schemas"]["Body_check_alias_testing_alias_post"][
+            "properties"
+        ]
+    )
+
+    assert (
+        "otherId"
+        in schema["components"]["schemas"]["Body_check_validation_alias_testing_validation_alias_post"][
+            "properties"
+        ]
+    )

tests/test_alias_in_form.py

@@ -1,29 +0,0 @@
-from fastapi import FastAPI, Form
-from starlette.testclient import TestClient
-
-app: FastAPI = FastAPI()
-
-
-@app.post("/testing_alias")
-async def check_alias(id_test: int = Form(alias="otherId")):
-    return {"other_id": id_test}
-
-
-@app.patch("/testing")
-async def check_without_alias(id_test: int = Form()):
-    return {"id_test": id_test}
-
-
-client = TestClient(app)
-
-
-def test_without_alias():
-    response = client.patch("/testing", data={"id_test": 1})
-    assert response.status_code == 200
-    assert response.json() == {"id_test": 1}
-
-
-def test_get_alias():
-    response = client.post("/testing_alias", data={"otherId": "1"})
-    assert response.status_code == 200
-    assert response.json() == {"other_id": 1}