使用fastapi更新具有可为空属性的对象的最佳方法

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):
    name: str
    description: str = None
    price: float

# 假设我们有一个已经存在的对象
existing_item = Item(name="Item 1", description="Description 1", price=10.0)

@app.patch("/items/{item_id}")
async def update_item(item_id: int, item: Item):
    # 通过检查每个字段是否为None来确定哪些字段需要更新
    if item.name is not None:
        existing_item.name = item.name
    if item.description is not None:
        existing_item.description = item.description
    if item.price is not None:
        existing_item.price = item.price

    return existing_item