mongodb - 关联字段

1，博客表结构 Blog.js

var mongoose = require('mongoose')

mongoose.connect('mongodb://localhost/test',{ useUnifiedTopology: true , useNewUrlParser: true});

var Schema = mongoose.Schema;

var blogSchema = new Schema({

title: String,

author: String,

body: String,

comments: [{ body: String, date: Date }],

date: { type: Date, default: Date.now },

hidden: Boolean,

meta: {

votes: Number,

favs: Number

sort:{

type: mongoose.Schema.Types.ObjectId, ref: 'Sort'

}

});

var Blog = mongoose.model('Blog', blogSchema);

module.exports = Blog

2,分类表结构 Sort.js

var mongoose = require('mongoose')

mongoose.connect('mongodb://localhost/test',{ useUnifiedTopology: true , useNewUrlParser: true});

var Schema = mongoose.Schema;

var sortSchema = new Schema({

name:{type:String}

});

var Sort = mongoose.model('Sort', sortSchema);

module.exports = Sort

3，操作文件 api.js

const Blog = require('./Blog');

const Sort = require('./Sort');

async function cz(){

var sort1 = await Sort.findOne({name:"css"})

var blog1 = await Blog.find().populate('sort')

blog1.sort = sort1

await blog1.save()

}

cz()

巴特西