mongoose的population能否实现多级的联表查询 - CNode技术社区

case:

// mongoose.model('User', UserSchema);		
var mongoose = require('mongoose'),
 Schema = mongoose.Schema;
 var UserSchema = new Schema({
 name: {
 type: String,
 unique: 'Username already exists',
 required: 'Please fill in a username',
 trim: true },
 group: {
 type: Schema.Types.ObjectId ,
 ref: 'Group'
 }
 ......
 });
 // mongoose.model('Group', UserSchema);		
 var GroupSchema = new Schema({
 name: {
 type: String,
 unique: 'Groupname already exists',
 required: 'Please fill in a Groupname',
 trim: true },
 collection: {
 type: Schema.Types.ObjectId ,
 ref: 'Collection'
 }
 ......
 });
 // mongoose.model('Collection', UserSchema);		
var CollectionSchema = new Schema({
 title: {
 type: String,
 trim: true }
 ......
 });
Q:User.findOne().poplation('group').exec(function(..){
可以获得群组的信息,但怎样通过这样的查询直接获得collection的title信息等?
})

我也想知道

找到了,最新版的mongoose支持了deep-populate 官方文档: deep-populate

https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/ mingodb 支持 aggregate lookup 可以关联查询两个表,多级查询,多个lookup

来自酷炫的 CNodeMD