[英]MongoDB: Populate or Query for two collections
我有以下模式:
let ProjectSchema = new mongoose.Schema({
title: {
type: String
},
employees: {
user: String, // ==> ObjectId of User from UserSchema
role: String,
workload: Number,
},
description: {
type: String
}
});
let UserSchema = new mongoose.Schema({
email: {
type: String,
required: true,
trim: true
},
name: {
type: String
},
projects: {
type: Array // ==> ObjectId of Project from ProjectSchema
}
});
我想要实现的是通过_id
或email
获取用户,并从他的项目中获取所有数据,例如:
{
"user": {
"_id": "asdf1234",
"email": "your@email.com",
"name": "Max"
"projects": {
"title": "Project 1",
"description": "Just a text",
"employees": {
"user": "asdf1234",
"role": "developer",
"workload": 40
}
}
}
}
我也想通过ID获得一个特定的项目,并且employee.user字段应填充正确的用户数据。
我可以用猫鼬populate
吗? 我的方法是先执行User.findOne()
,然后检查project.id,然后检查Project.findOne()
。
您如何在UserSchema中引用一个项目数组,那样当您查询用户时,您正在查询与该用户绑定的所有项目。
let mongoose = require("mongoose");
let Projects = require("./projects");
let UserSchema = new mongoose.Schema({
email: {
type: String,
required: true,
trim: true
},
name: {
type: String
},
projects: {
type: [Projects.schema]
}
});
然后,每次您查询用户时,它都会附带与该用户关联的项目。
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