node js中的多对多关联 [英] many to many association in node js

问题描述

这里是我的代码链接.我在 api-routes-index.js 中的 index.js 中遇到错误.获取错误未定义的地图函数

推荐答案

sequilize.js 中的多对多关联这将有助于您解决问题:

Many to many associations in sequilize.js This will be helpful for you to solve the issue:

一个产品有多个订单

一个订单有多个产品

由于多对多，我们有连接表orderproduct"其中包含 product_id 和 order_id.

As a result of many to many we have junction table "orderproduct" which contains product_id and order_id.

   //  In product model
    product.belongsToMany(order, {          
                through: 'orderproduct',
                foreignKey: 'product_id'
            });

   // In order model
    order.belongsToMany(product, {          
                through: 'orderproduct',
                foreignKey: 'order_id'
            });

   // In oderproduct model 
        orderproduct.belongsTo(product, {
            foreignKey: { name: 'product_id', allowNull: false }
        });
        
        orderproduct.belongsTo (order, {
            foreignKey: { name: 'order_id', allowNull: false }
        });
    }

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