This week's Ruby news, issue 311

Jobs

• Sr. Javascript / Ruby DeveloperSticker Mule is looking for passionate engineers to join our remote team. Come help us build the best e-commerce experience using Ruby, Rails, React, Node, Docker and more. Sticker Mule
• Ruby on Rails Engineer at Instacart (San Francisco)Less than 2% of US grocery spend last year was online. We're going to change that. Come work with us on its fun, challenging problems. Instacart
• Get 5+ Engineering Job Offers in 1 WeekWith Hired, companies apply to hire you - get salary and equity offers before you interview from companies like Facebook, Postmates, & Square Hired.com

In brief

• Daniel Kehoe's Learn Ruby on Rails 5 Kickstarter news
  Daniel is updating his popular Rails intro book to Rails 5. 
  Kickstarter
• New Framework Defaults in Rails 5 to Make Upgrade Easier news
  Rails 5 adds feature flags for all the breaking changes to make the upgrade process easier. 
  Srihari K
• Find and Fix Ruby Errors Faster (and have fun doing it) 
  Quickly pinpoint what’s broken and why. Get the context and insights to defeat all Ruby errors. 
  ROLLBAR   Sponsored
• Exporting Data to a XLSX Spreadsheet from Rails tutorial 
  Igor Marques da Silva
• Rake Explained: A Primer for Ruby's Task Management Tool tutorial 
  Rudy Yazdi
• Run Rails Migrations Automatically on Heroku tutorial 
  Corey Martin
• How to Scrape Web Sites with Ruby and Watir tutorial
  A very basic intro. Watir is powered by Selenium, so you can even use it to interact with on-page JavaScript. 
  TIMCRAFT
• Rails and Webpack: No Gem Required tutorial 
  Kir Shatrov
• A Look Into Bloom Filters with Ruby tutorial 
  Fernando Mendes
• Rails 5 Allows Wildcard For Specifying Template Dependencies For Cache Digests tutorial 
  Abhishek Jain
• Spy vs Double vs Instance Double tutorial 
  Mauro Otonelli
• Elixir for Rubyists: A Simple, Accessible 13 Minute Intro video 
  Tute Costa
• The Upgrade Trails: Tips for Upgrading Rails Apps opinion
  Lessons learnt from a Rails 3 to Rails 4 migration that took two years. 
  Olivier Lacan
• Thoughts on Ruby’s Reputation opinion
  Reflections inspired by Adam Hawkins’ 2015 post on the future of the Ruby community. 
  Alan Bradburne
• Semaphore Test Boosters: Cut Your Build Time to ~ 3 Minutes tools
  Automatically parallelize your Ruby test suite, no matter its size. Book a personal demo today. 
  Semaphore   Sponsored
• A PDF Minitest Cheat Sheet tools
  A reference to the basic methods and syntax for Minitest and Minitest::Spec as well as a full listing of all assertions and expectations. 
  Chris Kottom
• Oprah: Opinionated Presenters for Rails 5 code
  Designed to be very lightweight, easy to est, and with no monkey patching. 
  Tobias Svensson
• emittr: A Ruby Event Emitter Implementation code 
  Talysson de Oliveira Cassiano