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第一部分：FastAPI 和 MongoDB 后端

确保你的 FastAPI 应用已经配置好，并且 MongoDB 数据库已经运行。以下是完整的后端代码：

# main.py
from fastapi import FastAPI, HTTPException, Depends
from motor.motor_asyncio import AsyncIOMotorClient
from pydantic import BaseModel
from bson import ObjectId
from typing import Optional
from fastapi.middleware.cors import CORSMiddlewareapp = FastAPI()# 允许所有来源访问
app.add_middleware(CORSMiddleware,allow_origins=["*"],allow_credentials=True,allow_methods=["*"],allow_headers=["*"],
)# MongoDB 连接
client = AsyncIOMotorClient("mongodb://localhost:27017")
db = client["blogdb"]
collection = db["blogs"]# 定义博客模型
class Blog(BaseModel):title: strcontent: strauthor: strcreated_at: str# 创建一个博客
@app.post("/blogs/")
async def create_blog(blog: Blog):result = await collection.insert_one(blog.dict())return {"_id": str(result.inserted_id)}# 获取所有博客
@app.get("/blogs/")
async def get_blogs():blogs = await collection.find().to_list(length=100)return [{"_id": str(blog["_id"]), **blog} for blog in blogs]# 通过路径参数获取单个博客
@app.get("/blogs/{blog_id}")
async def get_blog(blog_id: str):blog = await collection.find_one({"_id": ObjectId(blog_id)})if not blog:raise HTTPException(status_code=404, detail="Blog not found")