Question

我有带有嵌入式文档数组宠物的users.js模式。对于每个用户，用户可以拥有多只宠物（通常不超过3只）。

对于每只宠物，都会有一张日常图表。所以对于宠物来说，这将是许多日常图表。我已经阅读了嵌入式文档，每个数组元素都被编入索引。在daily.js中，如何引用populate（）函数所属的宠物？

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

var userSchema = new Schema({
    firstName: { type: String, required: true },
    lastName: { type: String, required: true },
    username: { type: String, required: true, unique: true },
    location: String,
    pets: [{ name: 'string', animalType: 'string'}], //could have more than one pet
    created_at: Date,
    updated_at: Date
});

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

var dailySchema = new Schema({
  tite: String,
  _pet: { type: Number, ref: 'User.pet' }, // not sure how to reference name in user.pets[#] array
  created_at: Date,
  updated_at: Date
});

Answer 1

Quoting

很抱歉让人失望，但这是一种反模式。 Populate不能从另一个集合的subdocs填充 - 你得到该错误的原因是没有板的模型。

因此，引用嵌入式文档可能不是很好。最好将pet与User分隔为一个架构

var PetSchema = new Schema ({ 
    name: 'string', 
    animalType: 'string'
});

UserSchema和DailySchema将是

var userSchema = new Schema({
    ...
    pets: [{ type: Schema.Types.ObjectId, ref: 'Pet' }], //could have more than one pet
});

var dailySchema = new Schema({
  _pet: { type: Number, ref: 'Pet' }, // not sure how to reference name in user.pets[#] array
});

Mongoose-如何引用嵌入文档元素？

1 个答案: