文章目錄

• • 1. PUT 更新
  • 2. 用 PATCH 進行部分更新

learn from https://fastapi.tiangolo.com/zh/tutorial/body-updates/

1. PUT 更新

• 注意，put 沒有指定的值，會被重置為默認值

from typing import List, Optionalfrom fastapi import FastAPI from fastapi.encoders import jsonable_encoder from pydantic import BaseModelapp = FastAPI()class Item(BaseModel):name: Optional[str] = Nonedescription: Optional[str] = Noneprice: Optional[float] = Nonetax: float = 10.5tags: List[str] = []items = {"foo": {"name": "Foo", "price": 50.2},"bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},"baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []}, }@app.get("/items/{item_id}", response_model=Item) async def read_item(item_id: str):return items[item_id]@app.put("/items/{item_id}") async def update_item(item_id: str, item: Item):update_item_encoded = jsonable_encoder(item)items[item_id] = update_item_encodedreturn jsonable_encoder(items)

2. 用 PATCH 進行部分更新

• 只發送 要更新的數據，其余數據保持不變
• 可以在 Pydantic 模型的 .dict() 中使用 exclude_unset 參數：排除沒有設置的參數(默認值的參數)
• .copy() 為已有模型創建副本，調用 update 參數更新數據

from typing import List, Optionalfrom fastapi import FastAPI from fastapi.encoders import jsonable_encoder from pydantic import BaseModelapp = FastAPI()class Item(BaseModel):name: Optional[str] = Nonedescription: Optional[str] = Noneprice: Optional[float] = Nonetax: float = 10.5tags: List[str] = []items = {"foo": {"name": "Foo", "price": 50.2},"bar": {"name": "Bar", "description": "The bartenders", "price": 62, "tax": 20.2},"baz": {"name": "Baz", "description": None, "price": 50.2, "tax": 10.5, "tags": []}, }@app.get("/items/{item_id}", response_model=Item) async def read_item(item_id: str):return items[item_id]@app.patch("/items/{item_id}", response_model=Item) async def update_item(item_id: str, item: Item):stored_item_data = items[item_id] # 提取存儲的數據stored_item_model = Item(**stored_item_data) # 原來的數據生成新的modelupdate_data = item.dict(exclude_unset=True) # 原來的model除去未設置的字段updated_item = stored_item_model.copy(update=update_data)# 創建新的model副本，更新數據(只更新設置的字段)items[item_id] = jsonable_encoder(updated_item) # 模型副本轉換為可存入數據的形式，存入數據庫return updated_item

總結

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