Mongoose the table associated with the primary key, and automatically bring out the data of another table

There are two tables

addon_passwordbox_category

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

/***
 *  Encrypted password table 
 *2018 year 10 month 18 Japan 14:41:23
 */
var addon_passwordbox_list = new Schema({
  email: String,             //  User mailbox 
  title: String,             //  Title of password 
  encryptedPassword: String, //  Encrypted password 
  catId: {type: Schema.Types.ObjectId, ref: 'addon_passwordbox_category'},             // addon-passwordbox-category Of the corresponding category in the table _id
  desc: String,              //  Description of password 
  CreatedDate: {type: Date, default: Date.now()}         //  Creation time 
})

mongoose.model('addon_passwordbox_list', addon_passwordbox_list)

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

/***
 *  Classification table of passwords 
 *2018 year 10 month 18 Japan 14:41:23
 */
var addon_passwordbox_category = new Schema({
  email: String,             // addon-passwordbox-list In the table _id
  name: String,              //  No encrypted password 
  desc: String,              //  Description of category 
  CreatedDate: {type: Date, default: Date.now()}          //  Creation time 
})

mongoose.model('addon_passwordbox_category', addon_passwordbox_category)

addon_passwordbox_list

Two tables are used catId Associate as primary key Now check addon_passwordbox_list The associated addon_passwordbox_category The data table

Use

populate()

The code is as follows :

 findAllByCondition: function (condition, callback) {
    addon_passwordbox_list
      .find(condition, {__v: 0})
      .lean()
      .populate('catId', 'id name')
      .exec(function (err, reply) {
        if (err) {
          callback(err || new Error('find all by conditon error'))
        } else {
          callback(null, reply)
        }
      })
  },

In addition, it can be used in this way

.populate({
  path: 'fans',
  match: { age: { $gte: 21 }},
  select: 'name -_id',
  options: { limit: 5 }
})