如何通过sequelize queryInterface插入具有关联的行答案

【问题标题】：How to insert a row with association through sequelize queryInterface如何通过sequelize queryInterface插入具有关联的行
【发布时间】：2018-05-02 05:31:36
【问题描述】：

我正在使用带有 sequelize 的 sequelize cli 为多对多连接表生成种子文件

在这里，我将用户和集合以及 User_Collections 作为连接表我已经为用户和集合创建了种子文件，但我想为连接表创建种子文件。如何动态访问 User 或 Collection 中行的 id，以便可以将该值插入连接表 bulkinsert

用户：



    module.exports = {
      up: (queryInterface, Sequelize) => queryInterface.bulkInsert('Users', [ {
        first_name: 'John',
        last_name: 'Doe',
        email: 'john.doe@gmail.com',
        password: 'testme',
        createdAt: new Date(),
        updatedAt: new Date(),
      }], {}),
      down: (queryInterface, Sequelize) => queryInterface.bulkDelete('Users', null, {}),
    };



    module.exports = {
      up: (queryInterface, Sequelize) => queryInterface.bulkInsert('Collections', [{
        collection_name: 'Test Collection1',
        createdAt: new Date(),
        updatedAt: new Date(),
      }, {
        collection_name: 'Test Collection2',
        createdAt: new Date(),
        updatedAt: new Date(),
      }, {
        collection_name: 'Test Collection3',
        createdAt: new Date(),
        updatedAt: new Date(),
      }]),

      down: (queryInterface, Sequelize) => queryInterface.bulkDelete('Collections', null, {}),
    };

【问题讨论】：

标签： node.js postgresql sequelize.js sequelize-cli

【解决方案1】：

用户queryInterface.sequelize获取sequelize对象，然后查询你需要的id。

'use strict';
var Promise = require("bluebird");

module.exports = {
  up: (queryInterface, Sequelize) => {
    var sequelize = queryInterface.sequelize;
    return Promise.all([
    sequelize.query('SELECT id FROM users', { type: sequelize.QueryTypes.SELECT}),
    sequelize.query('SELECT id FROM collections', { type: sequelize.QueryTypes.SELECT}),
    ]).spread((userids, collectionsids)=>{
      var user_collections = [];
      userids.forEach(userId=> {
        collectionsids.forEach(collectionId =>{
              user_collections.push({
                user_id: userId.id,
                collection_id: collectionId.id,
                createdAt: new Date(),
                updatedAt: new Date(),
              })
        });
      });
      return queryInterface.bulkInsert('User_Collections', user_collections, {});
    })
  },
  down: (queryInterface, Sequelize) => {
    return queryInterface.bulkDelete('User_Collections', null, {});
  }
};

【讨论】：