how to create custom mongoose schematype code example

Example: mongoose custom object schema

var mongoose = require('mongoose');
Schema = mongoose.Schema;

var DishSchema = new mongoose.Schema({
  dishName: { type: String },
  tags:     { type: Array },
  price:    { type: Number },
  intro:    { type: String },
  dishPic:  { type: String },
  index:    { type: Number },
  comment:  { type: [{
    date:     {type: Date, default: Date.now },
    userId:   {type: String },
    content:  {type: String }
  }]}
});

var ShopSchema = new mongoose.Schema({
  shopName:       { type: String, unique: true },
  address:        { type: String },
  location:       { type: [Number], index: '2d' },
  shopPicUrl:     { type: String },
  shopPicTrueUrl: { type: String },
  mark:           { type: String },
  open:           { type: Boolean },
  shopType:       { type: String },
  dish:           { type: [DishSchema] },
  order:          { type: [{
    orderId:  { type: String },
    date:     { type: Date, default: Date.now },
    dish:     { type: [DishSchema] },
    userId:   { type: String }
  }]}
});

var Shop = mongoose.model('Shop', ShopSchema);
module.exports = Shop;