How to get socket.io to recognize when model has been updated - express

Question

I'm relatively new to MEAN/Mongoose/socket.io and am missing something that seems like it'd be basic, but regardless, it's keeping me from moving forward.
I'm keeping track of a group's meetings and have the following Schema:
'use strict';
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var ScheduleSchema = new Schema({
description: String,
meetingPlace: String,
office: String,
start: { type: Date, default: Date.now },
end: { type: Date, default: Date.now },
participants: [{
type: Schema.Types.ObjectId,
ref: 'User'
}],
author: {
type: Schema.Types.ObjectId,
ref: 'User'
},
timestamp: { type: Date, default: Date.now },
active: Boolean
});
ScheduleSchema.statics = {
load: function(cb) {
this.find({})
.populate({path:'participants'})
.exec(cb);
}
};
module.exports = mongoose.model('Schedule', ScheduleSchema);
When I create a new item in the Schedule model, this code sets it in motion (from a client-side controller):
$http.post('/api/schedules', { description: info.description, participants: attendees, meetingPlace: info.meetingPlace, office: info.office, start: info.start, end: info.end, timestamp: new Date(), active: true });
And because of this code:
'use strict';
var express = require('express');
var controller = require('./schedule.controller');
var router = express.Router();
router.get('/', controller.index);
router.get('/:id', controller.show);
router.post('/', controller.create);
router.put('/:id', controller.update);
router.patch('/:id', controller.update);
router.delete('/:id', controller.destroy);
module.exports = router;
I think the request is being routed to controller.create, which is the following:
'use strict';
var _ = require('lodash');
var Schedule = require('./schedule.model');
// Get list of schedules
exports.index = function(req, res) {
Schedule.load(function (err, schedules) { /*.find*/
if(err) { return handleError(res, err); }
return res.json(200, schedules);
});
};
// Get a single schedule
exports.show = function(req, res) {
Schedule.findById(req.params.id, function (err, schedule) {
if(err) { return handleError(res, err); }
if(!schedule) { return res.send(404); }
return res.json(schedule);
});
};
// Creates a new schedule in the DB.
exports.create = function(req, res) {
var promise = Schedule.create(req.body, function(err, schedule) {
if(err) { return handleError(res, err); }
return res.json(201, schedule);
});
};
// Updates an existing schedule in the DB.
exports.update = function(req, res){
var updatedMeeting = req.body;
var id = updatedMeeting._id;
delete updatedMeeting._id;
Schedule.update({_id : id}, updatedMeeting, { }, function (err, numberAffected, raw) {
if (err) return res.json(500, err);
updatedMeeting._id = id;
return res.json(201, updatedMeeting);
});
};
// Deletes a schedule from the DB.
exports.destroy = function(req, res) {
Schedule.findById(req.params.id, function (err, schedule) {
if(err) { return handleError(res, err); }
if(!schedule) { return res.send(404); }
schedule.remove(function(err) {
if(err) { return handleError(res, err); }
return res.send(204);
});
});
};
function handleError(res, err) {
return res.send(500, err);
}
After exports.create is run, and I don't know how, but something sends it over to here:
'use strict';
var Schedule = require('./schedule.model');
exports.register = function(socket) {
Schedule.schema.post('save', function (doc) {
onSave(socket, doc);
});
Schedule.schema.post('remove', function (doc) {
onRemove(socket, doc);
});
Schedule.schema.post('update', function (doc) {
onUpdate(socket, doc);
});
}
function onSave(socket, doc, cb) {
console.log('**********onSave**********');
Schedule
.findOne({ _id : doc._id })
.populate('participants')
.exec(function (err, event) {
if (err) return handleError(err);
socket.emit('schedule:save', event);
});
}
function onRemove(socket, doc, cb) {
socket.emit('schedule:remove', doc);
}
function onUpdate(socket, doc, cb) {
console.log('**********onUpdate**********');
socket.emit('schedule:update', doc);
}
and the line socket.emit('schedule:save', event); is called.
So that's all great, but when I update the Schedule model, I can't get socket to emit 'schedule:update' because it never gets to the "onUpdate" function in the code snippet just above this.
Starting from the client-side call:
$http.patch('/api/schedules/' + info._id, { _id: info._id, description: info.description, participants: attendees, meetingPlace: info.meetingPlace, office: info.office, start: info.start, end: info.end, timestamp: new Date(), active: true });
and the router sends that to exports.update, the model is updated, but socket doesn't emit anything, so all the clients connected see the old schedule information.
How and where can I relay to socket.io that the model has been updated? I think what I'm missing is how Schedule.schema.post('some action... gets called within the exports.register function, but I've been looking at this for a while and could use a hand - thanks.