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rails

Where Will Ruby Go Now? Talking with Tenderlove at RailsConf

Last week at RailsConf in Kansas City, Terence Lee and Richard Schneeman of Heroku’s Ruby Task Force sat down with the legendary Aaron Patterson (AKA tenderlove). Aaron has been working hard to make Ruby three times faster — a goal that Matz called Ruby 3×3. Along the way, Aaron has discovered that Ruby may face a hard decision. On one side, Ruby can continue to be the productive, general-purpose scripting language that it looks like today. But the other side of Ruby is that it’s used to run long-running processes in Rails applications, pushing it to be more performant, strongly-typed,…

Real-Time Rails: Implementing WebSockets in Rails 5 with Action Cable

It's been one year since Action Cable debuted at RailsConf 2015, and Sophie DeBenedetto is here to answer the question in the minds of many developers: what is it really like to implement "the highlight of Rails 5"? Sophie is a web developer and an instructor at the Flatiron School. Her first love is Ruby on Rails, although she has developed projects with and written about Rails, Ember and Phoenix. Recent years have seen the rise of "the real-time web." Web apps we use every day rely on real-time features—the sort of features that let you see new posts magically…

Container-Ready Rails 5

Rails 5 will be the easiest release ever to get running on Heroku. You can get it going in just five lines: $ rails new myapp -d postgresql $ cd myapp $ git init . ; git add . ; git commit -m first $ heroku create $ git push heroku master These five lines (and a view or two) are all you need to get a Rails 5 app working on Heroku — there are no special gems you need to install, or flags you must toggle. Let's take a peek under the hood, and explore the interfaces baked…

Speeding up Sprockets

The asset pipeline is the slowest part of deploying a Rails app. How slow? On average, it's over 20x slower than installing dependencies via $ bundle install. Why so slow? In this article, we're going to take a look at some of the reasons the asset pipeline is slow and how we were able to get a 12x performance improvement on some apps with Sprockets version 3.3+. The Rails asset pipeline uses the sprockets library to take your raw assets such as javascript or Sass files and pre-build minified, compressed assets that are ready to be served by a production…

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…

Patching Rails Performance

In a recent patch we improved Rails response time by >10%, our largest improvement to date. I'm going to show you how I did it, and introduce you to the tools I used, because.. who doesn’t want fast apps? In addition to a speed increase, we see a 29% decrease in allocated objects. If you haven't already, you can read or watch more about how temporary allocated objects affect total memory use. Decreasing memory pressure on an app may allow it to be run on a smaller dyno type, or spawn more worker processes to handle more throughput. Let's back…

Helios – open source framework for mobile

Heroku has a strong tradition with open source projects. Engineers have dedicated countless hours to the projects that developers count on every day. Open Source Software is in our DNA. Speaking personally, I’m passionate about building tools like AFNetworking and cupertino, in order to help developers build insanely great experiences for mobile devices. It’s with great pleasure that I introduce something new I’ve been working on: Helios is an open-source framework that provides essential back-end services for iOS apps. This includes data synchronization, push notifications, in-app purchases, and passbook integration. It allows developers to get a client-server app up-and-running while…

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…

Rails Security Vulnerability

A serious security vulnerability has been found in the Ruby on Rails framework. This exploit affects nearly all applications running Rails and a patch has been made available. Rails developers can get a full list of all your affected Heroku applications by following instructions here. Please address this security vulnerability by immediately upgrading your affected apps to any of the safe versions of Rails listed below. The following Rails versions have been patched and deemed safe from this exploit: 3.2.11 3.1.10 3.0.19 2.3.15 If you do not upgrade, an attacker can trivially gain access to your application, its data, and…

Rails 2.3.6+ Dependency Issues

This past Sunday, Rails 2.3.6 was released, and quickly followed by 2.3.7 and 2.3.8. One of the major changes in these new versions is to require a newer version of Rack, specifically 1.1.0, that is incompatible with Rails 2.3.5 and older. Due to the fairly complex ways in which Rubygems resolves dependencies, this can prevent your app from starting – in your local environment as well as when deployed on Heroku. If you’ve been affected by this issue, you would see this error message: Missing the Rails gem. Please `gem install -v= x.x.x`, update your RAILS_GEM_VERSION setting in config/environment.rb for…

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