1. Fast API를 이용한 CRUD - 패스트캠퍼스 백엔드 부트캠프 3기

1. 간단한 CRUD

from typing import Optional
from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

items = {
    0: {"name" : "라면",
        "price" : 1000},
    1: {"name" : "콜라",
        "price" : 2000},
    2: {"name" : "사이다",
        "price" : 3000}
}


# Path parameter
@app.get("/")
def read_root():
    return "Hello World"

@app.get("/items/{item_id}")
def read_item(item_id: int):
    item = items[item_id]
    return item

@app.get("/items/{item_id}/{key}")
def read_item_and_key(item_id: int, key : str):
    key = items[item_id][key]
    item = items[item_id]
    return item, key

# Query parameter
@app.get("/item-by-name")
def read_item_by_name(name: str):
    for item_id, item in items.items():
        if item['name'] == name:
            return item
    return {"error": "data not found"}

class Item(BaseModel):
    name: str
    price: int

@app.post("/items/{item_id}")
def create_item(item_id:int,item: Item):
    if item_id in items:
        return {"error" : "there is already existing key"}

    items[item_id] = item.dict()
    return {"success" : "OK"}

# 변수에 값이 필수가 아니다
class ItemForUpdate(BaseModel):
    name: Optional[str] = None
    price: Optional[int] = None

@app.put("/items/{item_id}")
def update_item(item_id:int, item : ItemForUpdate):
    if item_id not in items:
        return {"error": f"there is no item id:{item_id}"}

    if item.name:
        items[item_id]['name'] = item.name

    if item.price:
        items[item_id]['price'] = item.price

    return {"success" : "OK"}

@app.delete("/items/{item_id}")
def delete_item(item_id:int):
    items.pop(item_id)

    return {"success" : "OK"}

INFO:     Will watch for changes in these directories: ['C:\\Users\\gkwks\\IdeaProjects\\python-test']
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [17548] using StatReload
INFO:     Started server process [23156]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

• Uvicorn이 지정해준 URL로 접속하면 만들어진 html을 볼수 있고 URL뒤에 /doc를 붙이면 Swagger로 이동가능

http://127.0.0.1:8000/docs

• Try it out 버튼을 눌러서 값을 넣어 볼 수 있다.