from typing import Optional, List

from fastapi import FastAPI

from fastapi.encoders import jsonable_encoder

from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):

name: Optional[str] = None

description: Optional[str] = None

price: Optional[float] = None

tax: float = 10.5

tags: 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]

# PUT is used to receive data that should replace the existing data.

@app.put("/items/{item_id}", response_model=Item)

async def update_item(item_id: str, item: Item):

update_item_encoded = jsonable_encoder(item)

items[item_id] = update_item_encoded

return update_item_encoded

@app.patch("/items2/{item_id}", response_model=Item)

async def update_item_2(item_id: str, item: Item):

stored_item_data = items[item_id]

stored_item_model = Item(**stored_item_data)

update_data = item.dict(exclude_unset=True)

updated_item = stored_item_model.copy(update=update_data)

items[item_id] = jsonable_encoder(updated_item)

return updated_item

# PYTHONPATH=module_fastapi uvicorn fastapi_body_updates:app --reload