DmitryBash

class ExampleController
  include OrderingHelpers
  
  def index
    @clients = Clients.order(sanitized_ordering).where(user_id: current_user.id)
  end

end

DmitryBash

class Saga
  class << self
    def with_redis; raise NotImplementedError; end
    attr_accessor :cleanup_delay, :queue, :last_txid

    def queue
      Thread.current[:saga_queue] ||= []
    end

    def last_txid

DmitryBash

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

DmitryBash

Pry Cheat Sheet

• Youtube Tutorial 2013

Command Line

• pry -r ./config/app_init_file.rb - load your app into a pry session (look at the file loaded by config.ru)
• pry -r ./config/environment.rb - load your rails into a pry session

Debugger

DmitryBash

require 'socket'

# 1. Create

# AF_INET means IPv4 (xxx.xxx.xxx.xxx)
# SOCK_STREAM means communicating with a stream (TCP)
#
# Can be simplified to symbols :INET and :STREAM, respectively
server = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM)

DmitryBash

Webpack in Rails

All code is available in example app - https://github.com/maxivak/webpacker-rails-example-app

Table of Contents

• NPM and Yarn
• Webpack and Webpacker

DmitryBash

# app/channels/hello_channel.rb
class HelloChannel < ActionCable::Channel::Base
  def say_hello(data)
    times_to_say_hello = data.fetch("times_to_say_hello")
    hello = "Hello, #{current_profile.name}!"

    times_to_say_hello.times do
      ActionCable.server.broadcast(current_profile.id, hello)
    end
  end

DmitryBash

Setup

Replace IRB with Pry (in your Gemfile) and Byebug with pry-byebug.

gem 'pry-rails', group: [:development, :test]
gem 'pry-byebug', group: [:development, :test]

Using PRY