from fastapi import Body, FastAPI, status

from fastapi.responses import JSONResponse

app = FastAPI()

items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}

@app.put("/items/{item_id}")

async def upsert_item(item_id: str, name: str = Body(None), size: int = Body(None)):

if item_id in items:

item = items[item_id]

item["name"] = name

item["size"] = size

return item

else:

item = {"name": name, "size": size}

items[item_id] = item

return JSONResponse(status_code=status.HTTP_201_CREATED, content=item)