node.js - Sequelize 模型中的继承

Question

我有一些非常常见的领域。 (CreatedBy, CreatedDate, LastUpdatedBy, LastUpdatedDate) 。

当我创建模型时，有什么方法可以在我的模型中继承这些属性？

我查看了 sequelize docs 。但在那里找不到任何相关的东西。

目前，我正在创建的每个模型中指定这些属性:

const Sequelize = require('sequelize');
const conn = require('../common/mssql-connection');

const Member = conn.define('Member', {
  id: {
    type: Sequelize.INTEGER,
    field: "Id",
    autoIncrement: true,
    primaryKey: true
  },
  name: {
    type: Sequelize.STRING,
    field: "Name"
  },//Everything below this line is repetitive in other models. Inheritance would be useful here.
  createdDate: {
    type: Sequelize.DATE,
    field: "CreatedDate"
  },
  createdBy: {
    type: Sequelize.STRING,
    field: "CreatedBy"
  },
  lastUpdatedDate: {
    type: Sequelize.DATE,
    field: "LastUpdatedDate"
  },
  lastUpdatedBy: {
    type: Sequelize.STRING,
    field: "LastUpdatedBy"
  }
})

module.exports = Member;

Answer 1

我也没有设法找到“标准”方式，但是您可以拦截 Sequelize 构造函数的原始定义函数，处理您的默认字段:

 const originalDefine =  Sequelize.prototype.define; 

 Sequelize.prototype.define = function(tableName,fields){
    return originalDefine.call(this,tableName, {
          createdBy: { type: Sequelize.DataTypes.STRING,defaultValue:"default 'createdBy' value!!!!" },
           ...fields   
     })
 }

然后创建您的 Sequelize 实例..

const sequelize = new Sequelize(...)