This week's Ruby news, issue 337

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• Senior Rails Developer at Ascent (Chicago)Small well-funded B2B startup with big goals seeking an insatiably curious and uncompromisingly customer-focused dev to take responsibility for our consumer app and APIs. Ascent
• Full Stack and Production Engineers at Handshake (SF)Join a fast growing startup helping millions of students of all backgrounds across the country start their career. Handshake
• 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

Can't find the right job? Want companies to apply to you?Try Hired.com.

In brief

• Rails 4.2.8 Released: Rails 4.2 Now Supports Ruby 2.4 news 
  Official Rails Blog
• The Rails Girls 5th Anniversary Campaign is Open news
  Rails Girls gives scholarships to help women get started with a career in tech. 
  Rails Girls
• An AMA (Ask Me Anything) with David Heinemeier Hansson news
  The creator of Rails answered a lot of interesting questions. 
  Hashnode
• Rails to Phoenix: A 3-day training event in Berlin 
  Learn Elixir & Phoenix, building on your Rails expertise. Enter as novice, leave ready to build with Elixir. 
  simplabs   Sponsored
• 15 Weird Things About Ruby You Should Know tutorial
  A variety of things including redo, RbConfig, and using methods on heredocs. 
  Jesus Castello
• Stubbing the AWS SDK from Ruby tutorial
  How to write test-driven code that interacts with vendor APIs, using AWS Ruby SDK & DynamoDB as an example. 
  Louis McCormack
• Profiling MRuby Code tutorial
  A technical example of using mruby-prof to profile and debug mruby. 
  Mark McCurry
• Going Deeper with Service Objects in Rails tutorial
  Applying several refactorings to make service objects better. 
  Rob Race
• Pitfalls With ActiveRecord's Uniqueness Validator tutorial
  How to avoid validations that fail and how to clean up the data when they do. 
  Stefan Bruhns
• Digging into Ruby’s Unary ‘&’ Operator tutorial 
  Andrew Livingston
• [eBook] Database Performance Monitoring Buyer's Guide 
  This guide is designed to aid when evaluating database monitoring solutions for your unique environment. 
  VividCortex   Sponsored
• Upgrade Ruby, Find A Bug story
  A quick story of how a Ruby upgrade unveiled a bug in Tom’s code. 
  Tom Copeland
• Rails::API vs. Sinatra vs. Grape: A Comparison opinion 
  Derek Haynes
• ContrivedJSON: A JSON Parser Implemented using Flex, Bison, and Ruby code
  An example of using Flex and Bison to quickly produce LALR/GLR parsers. 
  Cameron Harper
• Refrigerator: Freezes All Core Ruby Classes code
  Makes sure nothing is changing core classes or modules at runtime. 
  Jeremy Evans
• Iodine: A Fast Concurrent Web Server for Real-Time Ruby Apps code
  Includes native support for WebSockets and static file serving. 
  Boaz Segev
• OmniAuth 1.6: The Flexible Rack Middleware-Based Auth System code 
  Michael Bleigh
• Rudisco: A Local (SQLite) Database of Info on 126,000 RubyGems code 
  Kuzichev Michael