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# spec/requests/api/v1/messages_spec.rb
describe "Messages API", type: :request do
  it 'retrieves a specific message' do
    message = FactoryGirl.create(:message)    
    get "/api/v1/messages/#{message.id}"

    # test for the 200 status-code
    expect(response).to be_success

    # check that the message attributes are the same.

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class Application < Rails::Application

  # ...
  
  config.middleware.insert_before Warden::Manager, Rack::Cors do
    allow do
      origins %r{^https?:\/\/[a-z0-9\-]+.yourdomain.com:?\d*$}i
      resource '*',
        headers: :any,
        methods: [:get, :post, :put, :create, :delete, :options]

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<% if Rails.env.production? %>
  <script>
    (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,'script','//www.google-analytics.com/analytics.js','ga');

    ga('create', 'UA-XXXXXXXX-X', 'auto');
    //ga('send', 'pageview');
  </script>

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def time_to_decimal(duration)
  if duration =~ /^([0-9]|0[0-9]|1[0-9]|2[0-3]):[0-5][0-9]$/
    time_pieces = duration.split(":")
    hours = time_pieces[0].to_i
    minutes = (time_pieces[1].to_f/60.0)

    # Final value ready
    (hours + minutes).round(2)
  end
end

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module Enumerable
  def to_histogram
    inject(Hash.new(0)) { | h, x | h[x] += 1; h }
  end
  
  def sort_by_frequency
    histogram = inject(Hash.new(0)) { | hash, x | hash[x] += 1; hash }
    sort_by { | x | [histogram[x], x] }
  end

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Pipeliner.pipeline redis do |pipe|
  objects.each do |object|
    pipe.enqueue redis.hgetall(object.key) do |result|
      object.values = result
    end
  end
end

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num_workers = 20
queue = SizedQueue.new num_workers * 2
threads = num_workers.times.map do
  Thread.new do
    while item = queue.pop
      #do_something item
    end
  end
end
list.each {|item| queue << item}

dpaluy

Once enabled, it automatically records all queries run against your database and records often and how long they took.

Enable: create extension pg_stat_statements

Note: it has a performance cost to leaving this always on, but it’s pretty small.

SELECT 
  (total_time / 1000 / 60) as total_minutes, 
 (total_time/calls) as average_time, 

dpaluy

class CacheCounterService
  def initialize
    @id = SecureRandom.hex(6)
  end

  def call
    # Make sure to load all models first
    Rails.application.eager_load!

    ActiveRecord::Base.descendants.each do |many_class|

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if defined?(PryByebug)
  Pry.commands.alias_command 'con', 'continue'
  Pry.commands.alias_command 's', 'step'
  Pry.commands.alias_command 'n', 'next'
  Pry.commands.alias_command 'f', 'finish'
end

begin
  require 'awesome_print'