Defining MongoDB Schemas , Next.js

// lib/models/Post.js
import mongoose from 'mongoose';

const PostSchema = new mongoose.Schema({
 title: {
  type: String,

  required: true,
 },

 content: {
  type: String,

  required: true,
 },
});

export default mongoose.models.Post || mongoose.model('Post', PostSchema);

// lib/mongoose.js
import mongoose from 'mongoose';

const uri = process.env.MONGO_URL;

async function connect() {
 if (mongoose.connection.readyState >= 1) return;

 return mongoose.connect(uri, {
  useNewUrlParser: true,
  useUnifiedTopology: true,
 });
}

export default connect;

// pages/api/posts.js
import connect from '../../lib/mongoose';
import Post from '../../lib/models/Post';

export default async function handler(req, res) {
 await connect();

 if (req.method === 'GET') {
  const posts = await Post.find({});
  res.status(200).json(posts);
 } else if (req.method === 'POST') {
  const post = new Post(req.body);
  await post.save();
  res.status(201).json(post);
 } else {
  res.setHeader('Allow', ['GET', 'POST']);
  res.status(405).end(`Method ${req.method} Not Allowed`);
 }
}