如何使用 Mongoose 查找子文档？

Question

我有 mongodb 数据库并使用mongoose。

它由以下架构组成

var Schedule = mongoose.Schema({
  StartType: Number,
  StartDateTime: Date,
  CollectionList: [CollectionSchema]
});

var CollectionSchema = mongoose.Schema({
  CollectionID: Number,
  CollectionName: String,
  chdata: [ChannelSchema]
});

var ChannelSchema = mongoose.Schema({
  ADChannelName: String,
  ADChannel: Number,
  ADChannelType: Number,
  DisplayColor: String,
  Command: String
});

Schedule = mongoose.model('schedule', ScheduleSchema);
Collection = mongoose.model('collection', CollectionSchema);
Channel = mongoose.model('channel', ChannelSchema);

Schedule.find({}, function(err, data) {
  if (err) {
    console.log(err);
  } else {
    console.log(data);
  }
});

所以我可以找到 Schedule 但我想找到 Collection 和 Channel 对象。

如何使用 mongoose 找到它们？

Answer 1

你可以用这个：

https://www.npmjs.com/package/mongoose-deep-populate

Schedule.find({}, function (err, schedules) {
   Schedule.deepPopulate(schedules, 'CollectionList.chdata', function (err, users) {
      // now each Schedule document includes CollectionList and each CollectionList includes chdata
   })
})