Node,Mongoose,保存多深度嵌套模式的问题

我无法通过Mongoose和node.js解决如何在MongoDB中插入多深度嵌套模式的问题.

下面的例子有点人为,但应该有希望解释我的问题.至于为什么每个模式被定义为完整模型但未在示例中使用,这只是因为在我的实际问题中,它们是实际的,可用的模型,并且我希望这个示例在其相关的情况下是现实的.

所以这里是相反顺序的示例模式定义,即.最小的俄罗斯娃娃第一:

// Define pen model
var PenSchema = new Schema({
  color: String // black, blue or red
});
var Pen = mongoose.model('Pen', PenSchema);

// Define ruler model
var RulerSchema = new Schema({
  units: String // inches or millimetres
});
var Ruler = mongoose.model('Ruler', RulerSchema);

// --------

// Define drawing tools model
var DrawingToolsSchema = new Schema({
  label: String,
  pens: [Pen]
});
var DrawingTools = mongoose.model('DrawingTools', DrawingToolsSchema);

// Define measuring tools model
var MeasuringToolsSchema = new Schema({
  label: String,
  ruler: [Ruler]
});
var MeasuringTools = mongoose.model('MeasuringTools', MeasuringToolsSchema);

// --------

// Define stationery box model
//  It has a label and two compartments - tools for drawing and measuring
var StationeryBoxSchema = new Schema({
  label: String,
  drawingTools: [DrawingToolsSchema],
  measuringTools: [MeasuringToolsSchema]
});
var StationeryBox = mongoose.model('StationeryBox', StationeryBoxSchema);

// To create my stationery box - this works
var stationery = new StationeryBox({ label: 'My Stationery Box' });

// To add the nested compartments - this works
stationery.drawingTools.push({ label: 'My Pens' });
stationery.measuringTools.push({ label: 'My Rulers' });

// But this is wrong as 'stationery.drawingTools.pens' is undefined
stationery.drawingTools.pens.push({ color: 'red' });
stationery.drawingTools.pens.push({ color: 'black' });

// Also wrong - presumably the second level of nesting is the problem
stationery.drawingTools.push({
  label: 'My Pens',
  pens: [ // These object represent second levels of nested schema
    { color: 'red' },
    { color: 'black' }
  ]
});

var DrawingToolsSchema = new Schema({
  label: String,
  pens: [Pen] // uh-oh, broken! Pen is a Model.
});

var StationeryBoxSchema = new Schema({
  label: String,
  drawingTools: [DrawingToolsSchema], // yes! DrawingToolsSchema is a Schema
  measuringTools: [MeasuringToolsSchema] // this one too.
});