Mongoose Schema引用一对多

Question

我想用Mongoose构建一对多的引用，但我不想保留一个id列表。

我有什么：

menuCategorySchema

var schema = new Schema({
    menuItem: [{
        type: Schema.ObjectId,
        ref: 'menuItem'
    }],
    icon: String,
    name: String
});

menuItemSchema

var schema = new Schema({
    menuCategory: {
        type: Schema.ObjectId,
        ref: 'menuCategory'
    },
    name: String,
    path: String
});

Mongo Collection menuItem：

{
    "_id" : ObjectId("54be856e9ba3a972e4dc924e"),
    "menuCategory" : ObjectId("54be84919ba3a972e4dc924d"),
    "name" : "I am a menu item",
    "path" : "/item/path"
}

Mongo Collection menuCategory：

{
    "_id" : ObjectId("54be84919ba3a972e4dc924d"),
    "icon" : "awsome",
    "name" : "Main Category"
}

预期结果：

var menuCategory = require('./models/menuCategory');
menuCategory.find({}).populate('menuItem').exec(function(err,result){
    console.log(result);
})

{
    "_id": ObjectId("54be84919ba3a972e4dc924d"),
    "icon": "awsome",
    "name": "Main Category"
    "menuItem": [{
        "_id": ObjectId("54be856e9ba3a972e4dc924e"),
        "menuCategory": ObjectId("54be84919ba3a972e4dc924d"),
        "name": "I am a menu item",
        "path": "/item/path"
    }]
}

我能够用 menuCategory 填充 menuItem ，但我想反过来。