Sync fastapi docs from b5ca1324 on 2025-12-07

docs_src/generate_clients/tutorial003_py39.py

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+from fastapi import FastAPI
+from fastapi.routing import APIRoute
+from pydantic import BaseModel
+
+
+def custom_generate_unique_id(route: APIRoute):
+    return f"{route.tags[0]}-{route.name}"
+
+
+app = FastAPI(generate_unique_id_function=custom_generate_unique_id)
+
+
+class Item(BaseModel):
+    name: str
+    price: float
+
+
+class ResponseMessage(BaseModel):
+    message: str
+
+
+class User(BaseModel):
+    username: str
+    email: str
+
+
+@app.post("/items/", response_model=ResponseMessage, tags=["items"])
+async def create_item(item: Item):
+    return {"message": "Item received"}
+
+
+@app.get("/items/", response_model=list[Item], tags=["items"])
+async def get_items():
+    return [
+        {"name": "Plumbus", "price": 3},
+        {"name": "Portal Gun", "price": 9001},
+    ]
+
+
+@app.post("/users/", response_model=ResponseMessage, tags=["users"])
+async def create_user(user: User):
+    return {"message": "User received"}