--- title: "This week's Ruby news, issue 294" publication: "Ruby Weekly" issue: 294 published_at: "2016-04-21" canonical_url: "https://rubyweekly.com/issues/294" --- This week's Ruby news, issue 294 This week's Ruby and Rails news[Read this e-mail on the Web](http://rubyweekly.com/issues/294) Ruby WeeklyIssue 294 — April 21, 2016 Robert Pankowecki[How I Hunted The Oddest Ruby Bug](http://blog.arkency.com/2016/04/how-i-hunted-the-most-odd-ruby-bug/)An interesting story and deep dive into solving a performance issue with background jobs caused by the way Ruby handles threads. YouTube[DHH on Rails Performance and Speed (video)](https://www.youtube.com/watch?v=ktZLpjCanvg)Just yesterday, David Heinemeier Hansson, the creator of Rails, spoke about Rails performance and shared opinions on app architecture, caching, and SPAs. Zachary Scott[The Road to Sinatra 2.0](http://zzak.io/log/2016-04-18-the-road-to-sinatra-2.0.html)A wrap up of all the upcoming changes and plans for Sinatra, the minimal webapp DSL (that inspired Node’s _Express_). HerokuSponsored[Speeding Up Sprockets](https://engineering.heroku.com/blogs/2016-02-18-speeding-up-sprockets/?c=7013A000000mKANQA2&utm_campaign=Display%20-%20Endemic%20-Cooper%20-Ruby%20-%20Blog%20-%20Sprockets&utm_medium=display&utm_source=cooperpress&utm_content=blog&utm_term=ruby)Heroku found why the asset pipeline is the slowest part of deploying a Rails app, and turned it into a 12x performance improvement on some apps with Sprockets version 3.3+. [Learn more.](https://engineering.heroku.com/blogs/2016-02-18-speeding-up-sprockets/?c=7013A000000mKANQA2=Display%20-%20Endemic%20-Cooper%20-Ruby%20-%20Blog%20-%20Sprockets=display=cooperpress=blog=ruby) [![Heroku\](https://copm.s3.amazonaws.com/c6f98020.png)](https://engineering.heroku.com/blogs/2016-02-18-speeding-up-sprockets/?c=7013A000000mKANQA2&utm_campaign=Display%20-%20Endemic%20-Cooper%20-Ruby%20-%20Blog%20-%20Sprockets&utm_medium=display&utm_source=cooperpress&utm_content=blog&utm_term=ruby) Nick Sutterer[Introduction to Cells: A Better View Layer for Rails](http://www.sitepoint.com/introduction-to-cells-a-better-view-layer-for-rails/)Nick Sutterer, the author of Cells and Trailblazer, introduces Cells and how it makes Rails views better. Beware: Strong opinions ahead! John Kevin Basco[How to Build a Rails JSON API with JSONAPI::Resources](http://tutorialsfordevs.com/tutorials/build-json-api-rails-jsonapi-resources/)[JSON API](http://jsonapi.org/) is a spec for building APIs that use JSON and [JSONAPI::Resources](https://github.com/cerebris/jsonapi-resources) is a library for Ruby bringing JSON API to Rails. Jake Yesbeck[How to Diagnose Rails 'N + 1' Query Problems](http://jakeyesbeck.com/2016/04/17/how-to-diagnose-ruby-on-rails-n-+-1-query-problems/)How you’d dig into a common performance optimization issue within a Rails app. Jobs - [Senior Backend Engineer at Drivy (Paris, France)](https://jobs.lever.co/drivy/08071b26-a86d-4e04-8a9d-1163da98bb3d?utm_source=rubyweekly&utm_medium=email)We're building the #1 peer-to-peer car rental service in Europe and we're looking for an experienced Ruby developer to help us tackle some exciting challenges. Drivy - [Ruby and JavaScript Developer (SF Bay Area)](https://www.beezwax.net/jobs/web-developer?utm_source=rubyweekly&utm_medium=email)Join an awesome web/mobile/DB consultancy that emphasizes teamwork and learning and puts employees first in everything we do. Beezwax - [The top VC-backed startups use Underdog.io to hire engineers. Join in 60 seconds.](https://underdog.io/?utm_medium=referral&utm_source=rubyweekly&utm_campaign=homepage-2016-apr-21&utm_content=hirethebest)If you’re accepted, startups will email you as soon as next Monday. You decide where to interview and where to work. Now open in SF, NYC, and remote. Join [Underdog.io](https://underdog.io/?utm_medium=referral=rubyweekly=homepage-2016-apr-21=hirethebest) today. Underdog.io In brief - [Book: Agile Web Development with Rails 5](https://pragprog.com/book/rails5/agile-web-development-with-rails-5?utm_source=rubyweekly&utm_medium=email) news The latest edition of the canonical Rails book. In beta now, final in June. The Pragmatic Bookshelf - [Rails 5 Adds 'accessed_fields' to Find Fields Actually Being Used](http://blog.bigbinary.com/2016/04/18/accesssed-fields-to-find-actually-used-fileds-in-Rails-5.html?utm_source=rubyweekly&utm_medium=email) news Abhishek Jain - [Major Changes to Test Controllers in Rails 5](http://blog.bigbinary.com/2016/04/19/changes-to-test-controllers-in-rails-5.html?utm_source=rubyweekly&utm_medium=email) news Abhishek Jain - [Get Live 1:1 Ruby Expert Help / Become a Ruby Codementor](https://www.codementor.io/ruby-experts?utm_source=newsletter-ad&utm_medium=newsletter&utm_term=help-become-mentor&utm_content=rubyweekly&utm_campaign=cooperpress-newsletter-ad) Are you a Ruby expert? Become a Codementor and get paid by helping your fellow developers. Learn Ruby faster with on-demand live expert help via screen sharing, video and chat. CodementorSponsored - [How the US Government Gets High Availability with Elasticsearch and Rails](https://18f.gsa.gov/2016/04/08/how-we-get-high-availability-with-elasticsearch-and-ruby-on-rails/?utm_source=rubyweekly&utm_medium=email) tutorial 18F Digital Services - [Using Postgres’ Hstore datatype in Rails](https://alybadawy.com/blog/2016-04-15/Using-Postgres-Hstore-datatype-in-Rails/?utm_source=rubyweekly&utm_medium=email) tutorial Aly Badawy - [Null Objects and the Law of Demeter](https://about.futurelearn.com/blog/null-objects-and-the-law-of-demeter/?utm_source=rubyweekly&utm_medium=email) tutorial James Coglan - [How to Find Ruby Code Smells with Reek](https://blog.codeship.com/how-to-find-ruby-code-smells-with-reek/?utm_source=rubyweekly&utm_medium=email) tutorial Piotr Szotkowski - [Using Webpack with Middleman](https://rossta.net/blog/using-webpack-with-middleman.html?utm_source=rubyweekly&utm_medium=email) tutorial ‘Ditch Sprockets and embrace the external pipeline.’ Ross Kaffenberger - [How to Receive and Reply to an SMS from Rails with Twilio](https://www.twilio.com/blog/2016/04/receive-and-reply-to-sms-in-rails.html?utm_source=rubyweekly&utm_medium=email) tutorial Greg Baugues - [Rails Fragment Caching in 7 Minutes](https://www.driftingruby.com/episodes/fragment-caching?utm_source=rubyweekly&utm_medium=email) video Dave Kimura - [When to Avoid The DRY Principle](https://www.madetech.com/blog/when-to-avoid-the-dry-principle?utm_source=rubyweekly&utm_medium=email) opinion Luke Morton - [In What World Would Ruby Become Faster Than Go?](https://www.quora.com/In-what-world-would-Ruby-become-faster-than-Golang/answer/Eleanor-McHugh?share=47e2896a) opinion Eleanor McHugh - [Why You Should Consider Grape for Building Web APIs](http://glaucocustodio.github.io/2016/04/14/why-you-should-taste-grape/?utm_source=rubyweekly&utm_medium=email) opinion And you can mount Grape-built APIs inside any other Rack / Rails app. Glauco Custódio - [Founders/CTOs: We upgrade Rails so that your team doesn't have to.](https://www.upgraderails.com/?utm_source=rubyweekly&utm_medium=email) tools Upgrade Rails is a new service from the founders of Hint.io and Honeybadger.io. Let our expert team keep your apps up to date so that you can focus on features, not maintenance. Upgrade RailsSponsored - [A Rails, React, Relay and GraphQL Tutorial and Demo App](http://toeatapp.startuplandia.io/?utm_source=rubyweekly&utm_medium=email) code tutorial Tutorials plus a demo app covering using ES6-based React to consume a declarative Rails-based GraphQL API. John Davison - [Rodauth: Auth and Account Management Framework for Rack Apps](https://github.com/jeremyevans/rodauth?utm_source=rubyweekly&utm_medium=email) code When used with Postgres, MySQL or SQL Server it provides extra security by using their security functions. Jeremy Evans - [Helpy: Open Source Mobile-First 'Helpdesk' App](https://github.com/helpyio/helpy?utm_source=rubyweekly&utm_medium=email) code Helpy - [AwsSesNewsletters: Send Newsletters via Amazon SES from Rails](https://github.com/10Pines/aws_ses_newsletters?utm_source=rubyweekly&utm_medium=email) code 10Pines Curated by [Peter Cooper](https://twitter.com/peterc) and [Glenn Goodrich](https://twitter.com/ruprict), and published by [Cooperpress](https://cooperpress.com/). Send feedback by simply replying to this mail. Want to sponsor an issue? See our [media kit.](https://cooperpress.com/mediakit) Want to post a job? Email us or [use our self-serve system.](https://booking.cooperpress.com/jobs) [Unsubscribe](*|UNSUB|*) | [Change email address](*|UPDATE_PROFILE|*) | [Read this issue on the Web](http://rubyweekly.com/issues/294) © Cooperpress Ltd. 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