140 lines
3.3 KiB
JavaScript
140 lines
3.3 KiB
JavaScript
/**
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* OrderItem 模型定义
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* @file OrderItem.js
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* @description 定义订单项模型，用于数据库操作
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*/
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const { DataTypes } = require('sequelize');
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const BaseModel = require('./BaseModel');
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const { sequelize } = require('../config/database-simple');
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/**
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* 订单项模型
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* @typedef {Object} OrderItem
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* @property {number} id - 订单项唯一标识
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* @property {number} order_id - 订单ID
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* @property {number} product_id - 产品ID
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* @property {number} quantity - 数量
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* @property {number} price - 单价（单位：分）
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* @property {Date} created_at - 创建时间
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*/
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class OrderItem extends BaseModel {
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/**
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* 获取订单的所有订单项
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* @param {Number} orderId 订单ID
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* @returns {Promise<Array>} 订单项列表
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*/
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static async getOrderItems(orderId) {
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return await this.findAll({
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where: { order_id: orderId },
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include: [{ model: sequelize.models.Product }]
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});
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}
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/**
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* 计算订单项总金额
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* @returns {Number} 总金额
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*/
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getTotalPrice() {
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return this.price * this.quantity;
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}
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/**
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* 更新订单项数量
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* @param {Number} quantity 新数量
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* @returns {Promise<Boolean>} 更新结果
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*/
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async updateQuantity(quantity) {
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try {
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if (quantity <= 0) {
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throw new Error('数量必须大于0');
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}
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// 检查产品库存
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const product = await sequelize.models.Product.findByPk(this.product_id);
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if (!product) {
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throw new Error('产品不存在');
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}
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const quantityDiff = quantity - this.quantity;
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if (quantityDiff > 0 && !product.hasEnoughStock(quantityDiff)) {
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throw new Error('产品库存不足');
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}
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// 使用事务确保数据一致性
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const result = await sequelize.transaction(async (t) => {
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// 更新订单项数量
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this.quantity = quantity;
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await this.save({ transaction: t });
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// 更新产品库存
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await product.updateStock(-quantityDiff, { transaction: t });
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// 更新订单总金额
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const order = await sequelize.models.Order.findByPk(this.order_id, { transaction: t });
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await order.calculateTotal({ transaction: t });
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return true;
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});
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return result;
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} catch (error) {
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console.error('更新订单项数量失败:', error);
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return false;
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}
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}
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}
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// 初始化OrderItem模型
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OrderItem.init({
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id: {
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type: DataTypes.INTEGER,
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primaryKey: true,
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autoIncrement: true
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},
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order_id: {
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type: DataTypes.INTEGER,
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allowNull: false,
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references: {
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model: 'orders',
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key: 'id'
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},
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onDelete: 'CASCADE'
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},
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product_id: {
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type: DataTypes.INTEGER,
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allowNull: false,
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references: {
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model: 'products',
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key: 'id'
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},
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onDelete: 'RESTRICT'
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},
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quantity: {
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type: DataTypes.INTEGER,
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allowNull: false,
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defaultValue: 1,
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validate: {
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min: 1
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}
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},
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price: {
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type: DataTypes.INTEGER,
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allowNull: false,
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comment: '单位：分'
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}
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}, {
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sequelize,
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tableName: 'order_items',
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modelName: 'OrderItem',
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timestamps: true,
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createdAt: 'created_at',
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updatedAt: false
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});
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/**
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* 导出订单项模型
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* @exports OrderItem
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*/
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module.exports = OrderItem; |