我有关系:
(追踪) - M:1 - > (TrackChannel)< - 1:M(频道)
(用户) - M:1 - > (UserChannel)< - 1:M(频道)
Channel
模型将对象Track
包含为current_track_id
,一对一关系。Track
和Channel
通过TrackChannel
User
和Channel
通过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})
}
}
});
};
这是我对频道的查询。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
}
});
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
}
我尝试创建查询以获得一个包含当前轨道对象和轨道列表的通道。现在它看起来像是:
{
"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
答案 0 :(得分:2)
猜猜它会帮助某人,所以提供另一种选择。
您可以将 nest:true
与 sequelize 提供的 raw:true
属性一起使用。
结果:
之前:
{
id: 1,
createdBy: 1,
'Section.id': 1,
'Section.name': 'Breakfast',
}
之后:
{
id: 1,
createdBy: 1,
Section: {
id: 1,
name: ''
}
}