你可以用100来描述它
填充是自动替换指定对象的过程
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);
要显示如何使用填充,请首先创建person对象aaron = new Person({firstname: 'Aaron'})
和event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,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);
});