Eugeny esshka

This is an example of how I combine interaction/service classes with Wisper event broadcasting in Rails.

In this example, I show a UsersController#create API, a corresponding service object, and all the test code/listeners to make it all happen.

The outcome is:

Concepts in your system ("Signing up a user", "Creating an order") have a single entry point in your codebase, vs. making stupid raw ActiveRecord calls to object.save in dozens of places.
Since your concept has one entry point (the service class), you can easily grep for usage of it.
Stupid easy to attach listeners to the service class
All event listeners are very small and easily unit tested

Typically you'll use defrecord (or even a basic map);
unless you need some specific Java inter-op,
where by you'll want to use deftype instead.

Note: defprotocol allows you to add new abstractions in a clean way Rather than (like OOP) having polymorphism on the class itself,

	#!/usr/bin/env node
	'use strict';

	var pg = require('pg');
	var QueryStream = require('pg-query-stream');
	var conString = "postgres://localhost/zoomator_new2";
	var Writable = require('stream').Writable;
	var deviceId = process.argv[2];
	var util = require('util');
	var _ = require('lodash');

	gem 'rails', '4.2.1' # prob works on others, too, but this is the one I figured it out on
	require "rails"
	require 'active_record'
	require 'action_controller/railtie'
	require 'action_view/railtie'

	# ===== Configuration =====
	Rails.logger = ActiveRecord::Base.logger = Logger.new $stdout
	ActiveSupport::LogSubscriber.colorize_logging = false

	;;
	;; NS CHEATSHEET
	;;
	;; * :require makes functions available with a namespace prefix
	;; and optionally can refer functions to the current ns.
	;;
	;; * :import refers Java classes to the current namespace.
	;;
	;; * :refer-clojure affects availability of built-in (clojure.core)
	;; functions.

	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-type" content="text/html; charset=utf-8">
	<title>Testing Pie Chart</title>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?2.1.3"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.geom.js?2.1.3"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?2.1.3"></script>

	<style type="text/css">

	(function() {
	var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

	Zoomator.directive("timeline", [
	"$filter", "$document", "$window", "FactorComputate", function($filter, $document, $window, FactorComputate) {
	return {
	restrict: "EA",
	replace: true,
	template: "<div id='timeline' style='height:90px;'><svg style='height:100%;width:100%;'></svg></div>",
	scope: {

	# Clear existing task so we can replace it rather than "add" to it.
	Rake::Task["deploy:compile_assets"].clear

	desc "Precompile assets locally and then rsync to web servers"
	task :compile_assets do
	on roles(:web) do
	rsync_host = host.to_s

	run_locally do
	with rails_env: :production do ## Set your env accordingly.