如何在我的Mongoose架构中引用另一个架构？

I'm building a Mongoose schema for a dating app.

我正在为约会应用程序构建一个Mongoose架构。

I want each person document to contain a reference to all the events they've been to, where events is another schema with its own models in the system. How can I describe this in the schema?

我希望每个人文档都包含对他们去过的所有事件的引用，其中事件是在系统中具有自己的模型的另一个模式。我如何在架构中描述这个？

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

1 个解决方案

#1

You can describe it by using Population

您可以使用人口来描述它

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.

填充是使用来自其他集合的文档自动替换文档中的指定路径的过程。我们可以填充单个文档，多个文档，普通对象，多个普通对象或从查询返回的所有对象。

Suppose your Event Schema is defined as follows:

假设您的事件模式定义如下：

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);

To show how populate is used, first create a person object, aaron = new Person({firstname: 'Aaron'}) and an event object, event1 = new Event({title: 'Hackathon', location: 'foo'}):

为了显示如何使用populate，首先创建一个person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);

Then, when you make your query, you can populate references like this:

然后，当您进行查询时，可以填充这样的引用：

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);
});

#1