使用Mongoose中间件修改请求正文

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

const userSchema = new Schema({
  name: String,
  age: Number,
  email: String
});

const User = mongoose.model('User', userSchema);

const modifyRequestBody = (req, res, next) => {
  // 在这里修改请求正文
  req.body.name = 'Modified Name';
  req.body.age = 25;

  // 调用下一个中间件函数
  next();
};

// 在保存用户之前应用中间件
userSchema.pre('save', modifyRequestBody);

const user = new User({
  name: 'John',
  age: 30,
  email: 'john@example.com'
});

user.save((err, savedUser) => {
  if (err) {
    console.error(err);
  } else {
    console.log(savedUser);
  }
});