如何在我的 Mongoose 模式中引用另一个模式？

Question

我正在为约会应用构建 Mongoose 架构。

我希望每个 person 文档都包含对他们去过的所有事件的引用，其中 events 是系统中具有自己模型的另一个模式。我如何在架构中对此进行描述？

var personSchema = mongoose.Schema({
    firstname: String,
    lastname: String,
    email: String,
    gender: {type: String, enum: ["Male", "Female"]}
    dob: Date,
    city: String,
    interests: [interestsSchema],
    eventsAttended: ???
});

Answer 1

可以用Population

来描述

Population is the process of automatically replacing the specified paths in the document with document(s) from other collection(s). We may populate a single document, multiple documents, plain object, multiple plain objects, or all objects returned from a query.

假设您的事件架构定义如下：

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

var eventSchema = Schema({
    title     : String,
    location  : String,
    startDate : Date,
    endDate   : Date
});

var personSchema = Schema({
    firstname: String,
    lastname: String,
    email: String,
    gender: {type: String, enum: ["Male", "Female"]}
    dob: Date,
    city: String,
    interests: [interestsSchema],
    eventsAttended: [{ type: Schema.Types.ObjectId, ref: 'Event' }]
});

var Event  = mongoose.model('Event', eventSchema);
var Person = mongoose.model('Person', personSchema);

为了展示如何使用 populate，首先创建一个人物对象 aaron = new Person({firstname: 'Aaron'}) 和一个事件对象 event1 = new Event({title: 'Hackathon', location: 'foo'}):

aaron.eventsAttended.push(event1);
aaron.save(callback);

然后，当您进行查询时，您可以像这样填充引用：

Person
.findOne({ firstname: 'Aaron' })
.populate('eventsAttended') // only works if we pushed refs to person.eventsAttended
.exec(function(err, person) {
    if (err) return handleError(err);
    console.log(person);
});

Answer 2

要在另一个table中引用一个table的ObjectId，请参考下面的代码

const mongoose = require('mongoose'),
Schema=mongoose.Schema;

const otpSchema = new mongoose.Schema({
    otpNumber:{
        type: String,
        required: true,
        minlength: 6,
        maxlength: 6
    },
    user:{
        type: Schema.Types.ObjectId,
        ref: 'User'
    }
});

const Otp = mongoose.model('Otp',otpSchema);

// Joi Schema For Otp
function validateOtp(otp) {
    const schema = Joi.object({
        otpNumber: Joi.string().max(6).required(),
        userId: Joi.objectId(),   // to validate objectId we used 'joi-objectid' npm package
        motive: Joi.string().required(),
        isUsed: Joi.boolean().required(),
        expiresAt: Joi.Date().required()
    });
    // async validate function for otp
    return schema.validateAsync(otp);
}

exports.Otp = Otp;
exports.validateOtp = validateOtp;

Answer 3

列表项

var personSchema = mongoose.Schema({
    firstname: String,
    lastname: String,
    email: String,
    gender: {
        type: String,
        enum: ["Male", "Female"]
    }
    dob: Date,
    city: String,
    interests: [interestsSchema],
    eventsAttended[{
        type: mongoose.Schema.Types.ObjectId,
        required: true,
        ref: "Place"
    }], 
**//ref:"Places"...you have put the other model name**
 *OR*
    eventsAttended[{
        type: mongoose.Types.ObjectId,
        required: true,
        ref: "Place"
    }],
});

如何在我的 Mongoose 模式中引用另一个模式？

How to reference another schema in my Mongoose schema?

mongoose

mongodb

node.js

要在另一个table中引用一个table的ObjectId，请参考下面的代码