Mongoose防止保存两张单据和子单据

const mongoose = require('mongoose');
const { Schema } = mongoose;

// 定义订单模式
const orderSchema = new Schema({
  orderId: { type: String, required: true, unique: true }, // 唯一索引防止重复订单
  customerName: String,
  // 其他字段...
});

// 定义子单据模式
const subOrderSchema = new Schema({
  subOrderId: { type: String, required: true },
  orderId: { type: Schema.Types.ObjectId, ref: 'Order', required: true },
  // 其他字段...
});

// 在订单模型上添加预保存钩子
orderSchema.pre('save', async function(next) {
  const Order = mongoose.model('Order');
  // 检查是否存在相同的订单
  const existingOrder = await Order.findOne({ orderId: this.orderId });
  if (existingOrder) {
    return next(new Error('订单已存在'));
  }
  next();
});

// 创建模型
const Order = mongoose.model('Order', orderSchema);
const SubOrder = mongoose.model('SubOrder', subOrderSchema);

module.exports = { Order, SubOrder };