是否可以在mongoose中引用子文档模式？

就像下面一样

var sectionSchema = mongoose.Schema(
{
    id:{type:String,required:true},
    name:{type:String,required:true}
});
var courseSchema = mongoose.Schema(
{
    id:{type:String,required:true},
    name:{type:String,required:true},
    sections:[sectionSchema]
});
var studentSchema = mongoose.Schema(
{
    id:{type:String,required:true},
    name:{type:String,required:true},
    course:{type:mongoose.Schema.Types.ObjectId,ref: 'courseSchema'},
    section:{type:mongoose.Schema.Types.ObjectId,ref: 'sectionSchema'},
    contactnumber:{type:String,required:true},
    parentname:{type:String,required:true}
});
var schoolSchema = mongoose.Schema(
{
    id:{type:String,required:true},
    name:{type:String,required:true,unique:true},
    address:{type:String,required:true},
    year:{type:String,required:true},
    contactnumber:{type:String,required:true},
    courses:[courseSchema],
    students:[studentSchema]
});

var School = mongoose.model('School',schoolSchema);

在上面的模型中我有课程里面的部分是学校文件 . 我有学生模式在学校文档里面我希望课程指向课程模式和部分指向部分模式 . 所以可以在mongoose中引用子文档模式 .

node.js mongodb mongoose database