子文档的填充路径

Question

我在以下模式的人口方面遇到了实际问题。它可能不是最好的模型设计(相对于MEAN堆栈来说比较新)，但我可以让它填充除了Spec模型之外的所有东西。

// Spec Model
var SpecSchema = new Schema({
  time: { 
    type: Date,
    default: Date.now
  },
  active: {
    type: Boolean,
    default: 'true'
  },
  name: String,
  desc: String
});
module.exports = mongoose.model('Spec', SpecSchema);
// Thing model
var specsSchema = new Schema({
  time: { 
    type: Date,
    default: Date.now
  },
  spec: { 
    type: Schema.Types.ObjectId, 
    ref: 'Spec' 
  },
  value: String,
});
var ThingSchema = new Schema({
  time: { 
    type: Date,
    default: Date.now
  },
  active: { 
    type: Boolean,
    default: true
  },
  title: String,
  specs: [specsSchema]
});
var Thing = mongoose.model('Thing', ThingSchema);
// Set model
var thingsSchema = new Schema({
  time: { 
    type: Date,
    default: Date.now
  },
  active: {
    type: Boolean,
    default: 'true'
  },
  thing: { 
    type: Schema.Types.ObjectId, 
    ref: 'Thing' 
  }
});
var SetSchema = new Schema({
  user: { 
    type: Schema.Types.ObjectId, 
    ref: 'User' 
  },
  time: { 
    type: Date,
    default: Date.now
  },
  active: {
    type: Boolean,
    default: 'true'
  },
  title: String,
  things: [thingsSchema]
});
var Set = mongoose.model('Set', SetSchema);

标准人口很好，但我不能为我的生活让model.populate工作，从我看过的所有例子和解决方案中，我不清楚路径应该是什么。

Set.findById(req.params.id)
  .populate('things.thing')
  .populate('user', '_id name')
  .exec(function (err, set) {
    if(err) { return handleError(res, err); }
    if(!set) { return res.send(404); }
      Thing.populate(set,{
          path:'things.thing.specs.spec',
          select: 'name',
          model: Spec
      }, function(err, set){
        if ( err ) return res.json(400, err);
    });
    return res.json(set);
});

Answer 1

path:'things.thing.specs.spec',
      select: 'name',
      model: Spec

应该

path:'things.thing.specs.spec',
      select: 'name',
      model: 'Spec'