Sequelize 包含嵌套对象数组 - node.js

Question

我有关系：

(Track) -- M:1 --> (TrackChannel) <--1:M (Channel)
(User) -- M:1 --> (UserChannel) <--1:M (Channel)

• Channel模型包括对象Track作为current_track_id一对一的关系。
• Track并且Channel通过多对多相关TrackChannel
• User并且Channel通过多对多相关UserChannel

/* Channel.js: */

module.exports = function(sequelize, DataTypes) {
  return sequelize.define('channel', {
    id: {
      allowNull: false,
      primaryKey: true,
      type: DataTypes.UUID,
      defaultValue: DataTypes.UUIDV4,
    },
    current_counter: {
      type: DataTypes.INTEGER,
      allowNull: false,
      defaultValue: 0
    },
    track_counter: {
      type: DataTypes.INTEGER,
      allowNull: false,
      defaultValue: 0
    },
    track_id: {
      type: DataTypes.STRING,
      allowNull: true,
      references: {
        model: 'track',
        key: 'id'
      }
    },
    createdAt: {
      type: DataTypes.TIME,
      allowNull: true,
      defaultValue: sequelize.fn('now')
    },
    updatedAt: {
      type: DataTypes.TIME,
      allowNull: true,
      defaultValue: sequelize.fn('now')
    }
  }, {
    tableName: 'channel',
    classMethods:{
      associate:function(models){
        this.belongsToMany(models.user, { onDelete: "CASCADE", foreignKey: 'user_id', otherKey: 'channel_id', through: 'userChannel' })
        this.belongsToMany(models.track, { onDelete: "CASCADE", foreignKey: 'track_id', otherKey: 'channel_id', through: 'trackChannel' })
        this.belongsTo(models.track, {foreignKey: 'current_track_id' , foreignKeyConstraint: true})
      }
    }
  });
};

你在做什么？

那是我对频道的查询。我使用存储库模式：

return db.channel.findOne({
            raw:true,
            include: [
                { model: db.track, attributes: ['id', 'name','artist_name' ,'album_name'], where: {track_id, }, paranoid: true, required: false}
            ],
            where: {
                id: id
            }
        });

你期望发生什么？

我想得到：

{
  "id": "ce183d0a-e702-49a3-83b5-2912bbcf5283",
  "current_counter": 0,
  "track_counter": 0,
  "current_track_id": {} // object or null,
  "createdAt": "21:26:56.487217",
  "updatedAt": "21:26:56.487217",
  "tracks: [] // array or null
}

实际发生了什么？

我尝试创建查询以获取包含当前轨道对象和轨道列表的一个通道。现在看起来像这样：

{
  "id": "ce183d0a-e702-49a3-83b5-2912bbcf5283",
  "current_counter": 0,
  "track_counter": 0,
  "track_id": null,
  "createdAt": "21:26:56.487217",
  "updatedAt": "21:26:56.487217",
  "tracks.id": null,
  "tracks.name": null,
  "tracks.artist_name": null,
  "tracks.album_name": null,
  "tracks.trackChannel.id": null,
  "tracks.trackChannel.channel_id": null,
  "tracks.trackChannel.createdAt": null,
  "tracks.trackChannel.updatedAt": null,
  "tracks.trackChannel.track_id": null
}

方言：postgres 数据库版本：9.6 Sequelize 版本：3.3.0

Answer 1

我猜这会对某人有所帮助，因此提供另一种选择。

您可以nest:true与sequ​​elize 给出的属性一起使用raw:true。

结果：

前：

{
        id: 1,
        createdBy: 1,
        'Section.id': 1,
        'Section.name': 'Breakfast',
}

后：

{
  id: 1,
  createdBy: 1,
  Section: {
      id: 1,
      name: ''
      }
}

Answer 2

解决方案：

findById: function(id) {
        return db.channel.findOne({
            logging: true,
            include: [
                { model: db.track, attributes: ['id', 'name','artist_name' ,'album_name'], as: 'track'},
                { model: db.track, attributes: ['id', 'name','artist_name' ,'album_name'], as: 'tracks', paranoid: true, required: false}
            ],
            where: {
                id: id
            }
        });
    },