24 Extremely Useful Ruby Gems for Web Development

One of the nicer things about developing on the Ruby platform is the sheer amount of meticulously categorized, highly reusable code wrapped up as aptly named ‘gems’.
I’m sure you’ve heard of popular frameworks like Sinatra or the super popular Rails but you’re missing an entire spectrum of gems that handle issues at a much lower level. Start using these and watch your productivity shoot through the roof!
A Quick Note

I’m well aware that some of the gems listed here have Rails, or parts of Rails, as a dependency. That doesn’t mean that they are any less useful or need to be sneered at.
CarrierWave

Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends. It works well with Rack based web applications, such as Ruby on Rails.​

Related reading

• Github repo
• A Gentle Introduction to CarrierWave

Kaminari

Kaminari is a Scope & Engine based, clean, powerful, customizable and sophisticated paginator. Kaminari supports multiple ORMs (ActiveRecord, Mongoid, MongoMapper) multiple web frameworks (Rails, Sinatra), and multiple template engines (ERB, Haml).​

Related reading

• Github repo
• Railscasts #254 Pagination with Kaminari

HAML

Haml (HTML Abstraction Markup Language) is a layer on top of XHTML or XML that’s designed to express the structure of XHTML or XML documents in a non-repetitive, elegant, easy way, using indentation rather than closing tags and allowing Ruby to be embedded with ease. It was originally envisioned as a plugin for Ruby on Rails, but it can function as a stand-alone templating engine.​

Related reading

• HAML website
• An Introduction to Haml and Sinatra
• An Introduction to Haml

Authlogic

A simple, unobtrusive model based Ruby authentication solution. Authlogic is very flexible, it has a strong public API and a plethora of hooks to allow you to modify behavior and extend it.​

Related reading

• Github repo
• Railscasts #160 Authlogic

Shoulda

Shoulda is a gem that allows you to create more understandable tests for your Ruby application. Shoulda allows you to provide context to your tests enabling you to categorize tests according to a specific feature or scenario you’re testing.​

Related reading

• Github repo
• Shoulda Looked At It Sooner

factory_girl

factory_girl provides a framework and DSL for defining and using factories – less error-prone, more explicit, and all-around easier to work with than fixtures. It has straightforward definition syntax, support for multiple build strategies (saved instances, unsaved instances, attribute hashes, and stubbed objects), and support for multiple factories for the same class (user, admin_user, and so on), including factory inheritance.​

Related reading

• Github repo
• Using factory_girl to simplify our test setup

RMagick

RMagick is an interface between the Ruby programming language and the ImageMagick and GraphicsMagick image processing libraries.​

Related reading

• Github repo
• Drawing with RVG

Cancan

CanCan is an authorization library for Ruby on Rails which restricts what resources a given user is allowed to access and is decoupled from user roles. All permissions are stored in a single location and not duplicated across controllers, views, and database queries.​

Related reading

• Github repo
• Railscasts #192 Authorization with CanCan

Nokogiri

Nokogiri is an HTML, XML, SAX, and Reader parser. Among Nokogiri’s many features is the ability to search documents via XPath or CSS3 selectors. Nokogiri parses and searches XML/HTML very quickly, and also has correctly implemented CSS3 selector support as well as XPath support.​

Related reading

• Github repo
• Getting Started with Nokogiri
• Railscasts #190 Screen Scraping with Nokogiri

SASS

Sass makes CSS fun again. Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It’s translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.​

Related reading

• Github repo
• Railscasts #268 Sass Basics

Formtastic

Formtastic is a Rails FormBuilder DSL (with some other goodies) to make it far easier to create beautiful, semantically rich, syntactically awesome, readily stylable and wonderfully accessible HTML forms in your Rails applications.​

Related reading

• Github repo
• Railscasts #184 Formtastic Part 1
• Railscasts #185 Formtastic Part 2

Capistrano

Capistrano is a utility and framework for executing commands in parallel on multiple remote machines, via SSH. It uses a simple DSL (borrowed in part from Rake) that allows you to define tasks, which may be applied to machines in certain roles. It also supports tunneling connections via some gateway machine to allow operations to be performed behind VPN’s and firewalls.​

Related reading

• Github repo
• Railscasts #133 Capistrano Tasks

Omniauth

OmniAuth is a Ruby authentication framework that provides a standardized interface to many different authentication providers such as Facebook, OpenID, and even traditional username and password.​

Related reading

• Github repo
• How to Use Omniauth to Authenticate your Users
• Railscasts #241 Simple OmniAuth

Bundler

Bundler is a tool that manages gem dependencies for your ruby application. It takes a gem manifest file and is able to fetch, download, and install the gems and all child dependencies specified in this manifest. It can manage any update to the gem manifest file and update the bundle’s gems accordingly. It also lets you run any ruby code in context of the bundle’s gem environment.​

Related reading

• Github repo
• Using the New Gem Bundler Today

resque

Resque (pronounced like “rescue”) is a Redis-backed library for creating background jobs, placing those jobs on multiple queues, and processing them later. Resque is heavily inspired by DelayedJob.​

Related reading

• Github repo
• Do YOU know Resque?
• Railscasts #271 Resque

Jammit

Jammit is an industrial strength asset packaging library for Rails, providing both the CSS and JavaScript concatenation and compression that you’d expect, as well as YUI Compressor and Closure Compiler compatibility, ahead-of-time gzipping, built-in JavaScript template support, and optional Data-URI / MHTML image embedding.​

Related reading

• Github repo
• Using Jammit in Rails

capybara

Capybara helps you test Rails and Rack applications by simulating how a real user would interact with your app. It is agnostic about the driver running your tests and comes with Rack::Test and Selenium support built in.​

Related reading

• Github repo
• Capybara (and Selenium) with RSpec & Rails 3

Active Merchant

Active Merchant is an extraction from the e-commerce system Shopify. Shopify’s requirements for a simple and unified API to access dozens of different payment gateways with very different internal APIs was the chief principle in designing the library. It was developed for usage in Ruby on Rails web applications and integrates seamlessly as a plugin but it also works excellently as a stand alone library.​

Related reading

• Github repo
• Railscasts #144 Active Merchant Basics

eventmachine

EventMachine implements a fast, single-threaded engine for arbitrary networkcommunications. It’s extremely easy to use in Ruby. EventMachine wraps all interactions with IP sockets, allowing programs to concentrate on the implementation of network protocols. It can be used to create both network servers and clients.​

Related reading

• Github repo
• An introduction to eventmachine, and how to avoid callback spaghetti

mustache

Inspired by ctemplate, Mustache is a framework-agnostic way to renderlogic-free views.As ctemplates says, “It emphasizes separating logic from presentation:it is impossible to embed application logic in this templatelanguage.​

Related reading

• Github repo

Passenger

Phusion Passenger™ — a.k.a. mod_rails or mod_rack — makes deployment of Ruby web applications, such as those built on the revolutionary Ruby on Rails web framework, a breeze.​

Related reading

• Github repo
• Railscasts #122 Passenger in Development

Chef

Chef is a system integration framework designed to bring the benefits of configuration management to your entire infrastructure. With Chef, you can manage your servers by writing code, not by running commands.​

Related reading

• Github repo
• Getting started with Chef tutorial

Thinking Sphinx

A concise and easy-to-use Ruby library that connects ActiveRecord to the Sphinx search daemon, managing configuration, indexing and searching.​

Related reading

• Github repo
• Railscasts #120 Thinking Sphinx

Wrapping Up

So those were some of the awesome gems I’ve found extremely useful when I’m whipping up a web app in Ruby. I’m a 100% sure I’m missing a metric butt load of others though. Let me know about your favorite gems in the comments below and thank you so much for reading!






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