Club childschema Under parent on mongoose - mongodb

Question

I am using mongoose module
I have two Schema file
//First User File
var mongoose = require('mongoose');
const UserActivitySchema = require('./useractivity')
//User Schema
var UserSchema = new mongoose.Schema({
username: {
type: String
},
activity: [UserActivitySchema]
});
var User = module.exports = mongoose.model('User', UserSchema, 'User');
I already Tried to Create a subdocument but not able to acheive it
//Second Schema i.e supposed to be child is on useractivity.js file
var mongoose = require('mongoose');
//User Activity Schema....011217
var UserActivitySchema = mongoose.Schema({
message_count:{
type: Number,
default: 0
}
});
exports.UserActivitySchema = UserActivitySchema;
By this, It will create the Entry like this:
{
"_id" : ObjectId("5ab38941ffbb87124c673862"),
"username" : "peter",
"activity" : []
}
What I want is to like this:
{
"_id" : ObjectId("5ab38941ffbb87124c673862"),
"username" : "peter",
"activity" : {
"message_count" : 0
}
}
Any help is really Appreciated..

Answer 1

Mongoose populate can help you to get the required functionalities. You can learn more about populate here. You can do it in this way,
Create UserActivitySchema
var mongoose = require('mongoose');
var UserActivitySchema = mongoose.Schema({
message_count:{
type: Number,
default: 0
}
});
module.exports = mongoose.model('UserActivity', UserActivitySchema, 'UserActivity');
Now create UserSchema like this
var mongoose = require('mongoose');
const UserActivitySchema = require('./useractivity')
//User Schema
var UserSchema = new mongoose.Schema({
username: {
type: String
},
activity: {
type: mongoose.Schema.Types.ObjectId,
ref: 'UserActivity',
}
});
var User = module.exports = mongoose.model('User', UserSchema, 'User');
Now, while you are saving a user save the _id of the UserActivity in activity
When you are making your query to get user you can do like this
User.findOne({_id: 5ab38941ffbb87124c673862})
.populate('UserActivity')
.exec(function(err, user) {
// do stuff with returned user
});