Mongoose findOne 通过 _id 嵌入文档

我正在尝试将菜单推送到嵌入文档。但我在餐厅里没有定义 findOne 。我只是想将一些文档推送到餐厅的菜单类别中。正如您在架构中看到的：

var RestaurantSchema = new mongoose.Schema({
    contactTelphone : String,
    address : String,
    branchID : String,
    email : String,
    restaurantName : String,
    userID : String,
    menuCategory : [MenuCategorySchema]
});

var MenuCategorySchema = new mongoose.Schema({
    menuCategory : String,
    menuCategoryAlt : String,
    sequence : Number,
    menus : [MenuSchema],
    restaurantInfo : { type: Schema.Types.ObjectId, ref: 'Restaurant' },
});

var MenuSchema = new mongoose.Schema({
    foodName : String,
    foodNameAlt : String,
    picName : String,
    price : String,
    rating : Number,
    menuSequence : Number,
    category : { type: Schema.Types.ObjectId, ref: 'MenuCategory' },
});

exports.menuForMenuCategory = function(newData, callback)
{
    console.log(newData);

    var menuCategoryId = newData.menuCategoryId;
    var restaurantId = newData.restaurantId;

    var newMenu = new Menu({
        foodName : newData.foodName,
        foodNameAlt : newData.foodNameAlt,
        picName : newData.picName,
        price : newData.price,
        cookingCategory : newCookingCategory,
        dishSpecial : newDishSpeical
    });

    Restaurant.findOne( {'_id' : restaurantId }, function(err, restaurant){
        if (!err) {
                    //Is it how to do this? It says "findOne not defined"
            restaurant.findOne( "_id" : menuCategoryId, function(err, category){
                category.push(newMenu);
            });
        }
    });
}

子文档有一个 .id() 方法，因此您可以执行以下操作：

myModel.findById(myDocumentId, function (err, myDocument) {
  var subDocument = myDocument.mySubdocuments.id(mySubDocumentId);
});

See http://mongoosejs.com/docs/subdocs.html http://mongoosejs.com/docs/subdocs.html以供参考。