✨ Add support for forbidding extra form fields with Pydantic models (#12134)

Co-authored-by: Sofie Van Landeghem <svlandeg@users.noreply.github.com>

docs_src/request_form_models/tutorial002.py

@@ -0,0 +1,15 @@
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+    model_config = {"extra": "forbid"}
+
+
+@app.post("/login/")
+async def login(data: FormData = Form()):
+    return data

docs_src/request_form_models/tutorial002_an.py

@@ -0,0 +1,16 @@
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+    model_config = {"extra": "forbid"}
+
+
+@app.post("/login/")
+async def login(data: Annotated[FormData, Form()]):
+    return data

docs_src/request_form_models/tutorial002_an_py39.py

@@ -0,0 +1,17 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+    model_config = {"extra": "forbid"}
+
+
+@app.post("/login/")
+async def login(data: Annotated[FormData, Form()]):
+    return data

docs_src/request_form_models/tutorial002_pv1.py

@@ -0,0 +1,17 @@
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+
+    class Config:
+        extra = "forbid"
+
+
+@app.post("/login/")
+async def login(data: FormData = Form()):
+    return data

docs_src/request_form_models/tutorial002_pv1_an.py

@@ -0,0 +1,18 @@
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+
+    class Config:
+        extra = "forbid"
+
+
+@app.post("/login/")
+async def login(data: Annotated[FormData, Form()]):
+    return data

docs_src/request_form_models/tutorial002_pv1_an_py39.py

@@ -0,0 +1,19 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Form
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class FormData(BaseModel):
+    username: str
+    password: str
+
+    class Config:
+        extra = "forbid"
+
+
+@app.post("/login/")
+async def login(data: Annotated[FormData, Form()]):
+    return data