postal.js/example/node/client/js/models/search-requests-model.js

define( [
	'backbone',
	'bus'
],
	function( Backbone, bus ) {
		"use strict";

		return Backbone.Model.extend({
			defaults: {
				requests: [],
				ownerId: undefined,
				sessionId: undefined
			},

			initialize: function() {
				_.bindAll( this );
				this.setSessionId();
				this.subscriptions = [
					bus.app.subscribe( "search.info", this.setOwner ),
					bus.app.subscribe( "search.requests", this.updateRequests ),
					bus.app.subscribe( "search.new.ask", this.addRequest )
				];
				bus.app.publish({
					topic: "get.search.requests",
					data: {}
				});
			},

			dispose: function(){
				_.each( this.subscriptions, function( subscription ){
					subscription.unsubscribe();
				});
				this.clear( { silent: true } );
			},

			setOwner: function( data, env ) {
				this.set("ownerId", data.id);
				this.setSessionId();
			},

			setSessionId: function() {
				var self = this;
				postal.utils.getSessionId(
					function( session ) {
						self.set( "sessionId", session.id, { silent: true } );
					}
				);
			},

			updateRequests: function( data, env ) {
				this.set( "requests", _.sortBy( data, function( item ) { return item.searchTerm; } ) );
			},

			addRequest: function( data, env ) {
				var reqs = this.get("requests");
				if( _.any( reqs, function( item ){
					return item.searchTerm === data.searchTerm &&
						item.correlationId === data.correlationId
				})) {
					return;
				}
				reqs.push( data );
				this.set( "requests", _.sortBy( reqs, function( item ) { return item.searchTerm; } ), { silent: true } );
				this.change("change:requests");
			}
		});
	});