javascript – Sequelize动态播种

我目前正在使用Sequelize.js播种数据,并使用硬编码值作为关联ID.这不理想,因为我真的应该能够动态地做到这一点吗？例如,将用户和配置文件与“拥有一个”和“属于”关联相关联.我不一定想用硬编码的profileId为用户播种.在创建配置文件后,我宁愿在配置文件种子中执行此操作.创建配置文件后,动态地将profileId添加到用户.使用Sequelize.js时,这是否可行？或者,在使用Sequelize进行播种时,硬编码关联ID会更常见吗？

也许我正在播种错误？我是否应该使用Sequelize使用一对一的种子文件和迁移文件？在Rails中,通常只有1个种子文件,如果需要,您可以选择分成多个文件.

一般来说,只需在这里寻找指导和建议.这些是我的文件：

users.js

// User seeds

'use strict';

module.exports = {
  up: function (queryInterface, Sequelize) {
    /*
      Add altering commands here.
      Return a promise to correctly handle asynchronicity.

      Example:
      return queryInterface.bulkInsert('Person', [{
        name: 'John Doe',
        isBetaMember: false
      }], {});
    */

    var users = [];
    for (let i = 0; i < 10; i++) {
      users.push({
        fname: "Foo",
        lname: "Bar",
        username: `foobar${i}`,
        email: `foobar${i}@gmail.com`,
        profileId: i + 1
      });
    }
    return queryInterface.bulkInsert('Users', users);
  },

  down: function (queryInterface, Sequelize) {
    /*
      Add reverting commands here.
      Return a promise to correctly handle asynchronicity.

      Example:
      return queryInterface.bulkDelete('Person', null, {});
    */
    return queryInterface.bulkDelete('Users', null, {});
  }
};

profiles.js

// Profile seeds

'use strict';
var models = require('./../models');
var User = models.User;
var Profile = models.Profile;


module.exports = {
  up: function (queryInterface, Sequelize) {
    /*
      Add altering commands here.
      Return a promise to correctly handle asynchronicity.

      Example:
      return queryInterface.bulkInsert('Person', [{
        name: 'John Doe',
        isBetaMember: false
      }], {});
    */

    var profiles = [];
    var genders = ['m', 'f'];
    for (let i = 0; i < 10; i++) {
      profiles.push({
        birthday: new Date(),
        gender: genders[Math.round(Math.random())],
        occupation: 'Dev',
        description: 'Cool yo',
        userId: i + 1
      });
    }
    return queryInterface.bulkInsert('Profiles', profiles);
  },

  down: function (queryInterface, Sequelize) {
    /*
      Add reverting commands here.
      Return a promise to correctly handle asynchronicity.

      Example:
      return queryInterface.bulkDelete('Person', null, {});
    */
    return queryInterface.bulkDelete('Profiles', null, {});
  }
};

正如你所看到的,我只是使用硬编码的for循环(非理想).

解决方法:

您可以使用sequelizes create-with-association功能将它们组合在一个文件中,而不是为用户和配置文件使用不同的种子.

另外,当使用一系列create()时,必须将它们包装在Promise.all()中,因为种子接口需要Promise作为返回值.

up: function (queryInterface, Sequelize) {
  return Promise.all([
    models.Profile.create({
        data: 'profile stuff',
        users: [{
          name: "name",
          ...
        }, {
          name: 'another user',
          ...
        }]}, {
        include: [ model.users]
      }
    ),
    models.Profile.create({
      data: 'another profile',
      users: [{
        name: "more users",
        ...
      }, {
        name: 'another user',
        ...
      }]}, {
        include: [ model.users]
      }
    )
  ])
}

不确定这是否真的是最好的解决方案,但这就是我如何在播种文件中自己维护外键.

标签：javascript,sequelize-js,seeding
来源： https://codeday.me/bug/20190608/1197351.html