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Upgrading to Rails 5 Beta – The Hard Way

Rails 5 has been brewing for more than a year. To take advantage of new features, and stay on the supported path, you'll need to upgrade. In this post, we'll look at the upgrade process for a production Rails app, codetriage.com. The codebase is open source so you can follow along. Special thanks to Prathamesh for his help with this blog post. How Stable is the Beta? In Rails a beta means the API is not yet stable, and features will come and go. A Release Candidate (RC) means no new features; the API is considered stable, and RCs will…

Ruby 2.3 on Heroku with Matz

Happy Holidays from Heroku. Congratulations to the ruby-core team on a successful 2.3.0 release, which is now available on Heroku — you can learn more about Ruby on Heroku at heroku.com/ruby. We had the pleasure of speaking with Matz (Yukihiro Matsumoto), the creator of Ruby and Chief Ruby Architect at Heroku, about the release. What’s New in Ruby 2.3: Interview with Matz Ruby releases happen every year on Christmas day. Why Christmas? Ruby was originally my pet project, my side project. So releases usually happened during my holiday time. Now, it’s a tradition. It’s ruby-core’s gift to the Ruby community.…

Incremental Garbage Collection in Ruby 2.2

This article introduces incremental garbage collection (GC) which has been introduced in Ruby 2.2. We call this algorithm RincGC. RincGC achieves short GC pause times compared to Ruby 2.1. About the Author: Koichi Sasada works for Heroku along with Nobu and Matz on C Ruby core. Previously he wrote YARV Ruby's virtual machine, and he introduced generational GC (RgenGC) to Ruby 2.1. Koichi wrote incremental GC for Ruby 2.2 and authored this paper. Background Ruby uses GC to collect unused objects automatically. Thanks to GC, Ruby programmers do not need to release objects manually, and do not need to worry…

Debugging Super Methods with Ruby 2.2

Debugging a large codebase is hard. Ruby makes debugging easier by exposing method metadata and caller stack inside Ruby's own process. Recently in Ruby 2.2.0 this meta inspection got another useful feature by exposing super method metadata. In this post we will look at how this information can be used to debug and why it needed to be added. One of the first talks I ever wrote was "Dissecting Ruby With Ruby" all about inspecting and debugging Ruby processes using nothing but Ruby code. If you've never heard of the Method method it's worth a watch. In short, Ruby knows…

Announcing A Very Ruby Thanksgiving

We’re very excited that our Heroku colleagues Matz, Nobu and Ko1 will all be visiting from Japan soon to attend RubyConf, and it’s especially serendipitous that it is happening in such close proximity to Thanksgiving. Not only is Thanksgiving one of the few holidays that Japan and the U.S. share, it’s a holiday that brings families together to reflect on what’s been accomplished, and to share insight into the future. We've been waiting for just the right opportunity to organize a small Ruby gathering and Thanksgiving provides the perfect setting. "I hope to see Ruby help every programmer in the…

Waza 2013: How Ecosystems Build Mastery

When we think of the concept of Waza (技) or "art and technique," it's easy to get caught up in the idea of individual mastery. It's true that works of art are often created by those with great skill, but acquiring that skill is neither solitary nor static. Generations of masters contribute to a canon and it is in that spirit that we built the Heroku platform and the Waza event. This year's Waza was no exception. On February 28th, more than 900 attendees participated in Waza including Ruby founder Yukihiro "Matz" Matsumoto, Django co-creator Jacob Kaplan-Moss and Codeacademy’s Linda…

Adding Concurrency to Rails Apps with Unicorn

With support for Node.js, Java, Scala and other multi-threaded languages, Heroku allows you to take full advantage of concurrent request processing and get more performance out of each dyno. Ruby should be no exception. If you are running Ruby on Rails with Thin, or another single-threaded server, you may be seeing bottlenecks in your application. These servers only process one request at a time and can cause unnecessary queuing. Instead, you can improve performance by choosing a concurrent server such as Unicorn which will make your app faster and make better use of your system resources. In this article we…

Run JRuby on Heroku Right Now

Over a year ago Heroku launched the Cedar stack and the ability to run Java on our platform. Java is known as a powerful language – capable of performing at large scale. Much of this potential comes from the JVM that Java runs on. The JVM is the stable, optimized, cross-platform virtual machine that also powers other languages including Scala and Clojure. Starting today you can leverage the power of the JVM in your Ruby applications without learning a new language, by using JRuby on Heroku. After a beta process with several large production applications, we are pleased to move…

Hacking mruby onto Heroku

If you're in the Ruby world, you've likely heard about mruby, Matz's latest experimental Ruby implementation. What I bet you didn't know is that you can run mruby on Heroku right now. As a matter of fact you can run just anything on Heroku, as long as it can compile it into a binary on a Linux box. If you're new to mruby, or to compiling binaries take a look at my last article Try mruby Today. I cover getting mruby up and running on your local machine. If you are already up to speed then follow along as we…

Ruby 2.0 Preview Available on Heroku

When Heroku first launched you could only use one version of Ruby: 1.8.6. As the Ruby implementation matured and improved, so did Heroku. We recently announced the ability to specify your ruby version on Heroku, and we are happy to announce the first preview-build of Ruby available: starting today you can use Ruby 2.0 preview1 on Heroku. Ruby 2.0 The Ruby core team has been hard at work on Ruby 2.0, which has a host of new features and boasts performance improvements. You can get a list of the major new features on the official Ruby 2.0.0 Preview1 announcement. Heroku…

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