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Ruby On Rails Best gems for Implementation

Ruby On Rails Best gems for Implementation?


    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.


    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).


    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.


    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.


    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.


    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.


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


    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.


    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.


    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.


    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.


    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.


    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.


    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.


    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.


    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.


    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.

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.


    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.


    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.


    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.


    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.

1. Devise (Authentication)

Just about every public-facing Rails app needs some type of authentication scheme. Authentication is often confused and interchanged with authorization, although the 2 terms have very distinct meanings.

In a nut shell, authentication determines if users are who they say they are, commonly through a username and password combination. Authorization determines which actions an authenticated user can perform. Devise is a solution to the former problem. I recently switched from AuthLogic in favor of Devise’s advanced engine for providing models, controllers and views. AuthLogic leaves it up to the developer to create the views and controllers. However, views are generally the first thing you should override, but thankfully Devise makes that easy as well.

Devise is a very active gem, and in conjunction with omniauth, has made it incredibly simple to setup Facebook and Twitter login buttons in less than a dozen lines of code. At first, the engine seemed too overbearing for me, but once I understood how easy it is to override and extend Devise, I made the switch.
2. CanCan (Authorization)

CanCan is an incredibly easy way to define and access user permissions. All apps tend to have some sort of authorization scheme, but it’s generally setup adhoc, and leads to very messy view code. If you have dozens of if object.user == current_user statements littered among your views and controllers, it’s time to take a look at CanCan.

If you aren’t authorizing the current user to modify a provided object in update actions, a user could send a post request to update another user’s project, for example. With CanCan, your app’s authorization scheme is defined centrally in an Ability model. By using the can? method, you can check to see if the current user is authorized to perform an action to handle conditional view rendering.

CanCan also makes it dead simple to authorize controller actions and handle authorization exceptions.
3. Haml (Better Views)

HAML transforms your views with sexy, minimalist syntax that makes Ruby jealous. HAML’s indent based syntax eliminates end tags, and provides a more concise way of defining HTML and interpreting embedded ruby code.

I made the switch about 2 years ago and cringe every time I have to work with “real” HTML. Even mediocre HTML ninjas will be comfortable with HAML in a few days. HAML takes:

<h2><%= %></h2>
<div class="about">About Me: <%= @user.about %></div>

and makes it great:

.about About Me: #{@user.about}
4. Compass (Better CSS)

Compass is a framework that does to CSS what HAML does to HTML. In conjunction with SASS, a CSS replacement, Compass provides native frameworks such as Blueprint. By leveraging SASS mixins, you can finally ditch non-semantic classes such as “div-8″ for blueprint columns.

The other major benefit of SASS is variables, most commonly used for color definitions. Tear up that sticky note with hex colors and start using color variables. Better yet, create an entire color palette using SASS’s lighten and darken functions.
5. Will Paginate (Pagination)

Will Paginate is by far the reigning champ when it comes to pagination. Originally ported from PHP, will_paginate can get you up and running with pagination in a few lines of code. There are practically no contenders, and rightfully so since I can’t think of too many ways to make this better. OK, Ajax pagination would be really awesome.
6. Paperclip (File Attachments)

If you’ve ever written code to handle file uploads and image processing, you surely cringe every time a client says “I’d like the user to have his or her own photo”–that is until you’ve worked with a gem as easy to use as this one.

Paperclip makes it trivial to restrict content types, define storage locations and access a model’s associated attachment. If you’re working with images, you can define styles with corresponding resolutions for use-cases such as thumbnails and profile sizes.

Even if you are using Heroku with its read-only file system, paperclip works beautifully with outside storage mechanism such as Amazon S3.
7. Meta Where (ActiveRecord Query Extensions)

This is a less popular gem that I ran into when I got sick of passing in complex SQL strings into ARel where methods, and then finding the inconsistencies between MySQL (development) SQLite (test) and Postgres (Heroku).

The default behavior of chaining ARel where methods is to “and” the conditions. Meta_where lets you define complex boolean logic on conditions, even among sub tables.
8. DelayedJob (Background Job Scheduling)

One of the easiest ways to speed up some Rails apps is to push more complex processing into background jobs. The most notorious offenders are image processing and emailing.

Instead of having the user wait on the browser while an email sends or an image is processed, (both items that can wait) offload these tasks to a later time and let the user continue.

This gem automatically handles scheduling and provides an easy way to run all scheduled jobs. With Heroku, running the jobs is as easy as pushing up the workers a notch.
9. Has Scope (Collection Filtering)

This gem does to filtering what will_paginate did to pagination. Most rails apps dealing with item collections that need to be filtered by an attribute such as location, category or tag, will benefit from this. By leveraging existing model scopes, you can keep your controllers lean without conditional statements for each possible filter query.

Simply use the has_scope method with the scope name in the controller, and pass the model into apply_scopes to take advantage instant filtering.
10. Rack SSL Enforcer (HTTPS Redirection)

With all the hype a few months ago over Firesheep, even basic, non credit-card accepting, apps that use passwords need for SSL. Sure, there’s no requirement that you secure your app, and even if a user’s account was compromised it may cause little harm.

However, most people reuse the same password for everything, and I wouldn’t like to have on my conscience that a user’s online banking password was stolen because they accessed my app without SSL at Starbucks.

Rack SSL Enforcer is a dead simple gem that uses Rack to redirect non https requests to the https equivalent. The default configuration forces HTTPS on every request, but can easily be overridden to only required it on some URL and URL patterns.

You may be familiar with the ssl_requirement gem originally released by DHH. This isn’t compatible with Rails 3, although there is a fork bartt-ssl_requirement that is which I’ve used in previous projects. I never really liked the idea of HTTPS redirection happening after the request gets to the controller. The rack solution is much simpler, especially for securing an entire app.

Devise ( Since some years ago, it represents the authentication mechanism preferred by all Rails developers. Powerful, flexible, allows to integrate with OAuth authentication systems with a minimal effort.

Haml ( Allows you to write valid XHTML concisely. The learning curve is relatively short.

Gritter ( After years of flash messages in the classic div in the page, we moved to Growl like notifications. Thanks to these pop-ups, we can show our flash messages in any page in a completely non-invasive and elegant way.

Cells ( Cells can really keep our controllers very skinny. We use it to represent and caching some boxes, like “recommended items”, “top users” and so on. I really like Cells over the use of helpers.

FriendlyId ( A perfect gem to make our url seo friendly.

SimpleForm ( We use it primarily for its excellent integration with Bootstrap and for its ease of use.

Paperclip ( Despite the years, it still remains the reference point for attachments management .

Kaminari ( Useful gem to manage paginated collections .

Cancan ( Our choice to manage permissions. We never have had the need to use some other solution .

Resque ( or Delayed Job ( Both are valuable supports to manage background processes. If you do not have enough resources to set up a Redis server, we recommend Delayed Job.

Sunspot ( After a brief period with thinking_sphinx, we have moved to this very powerful indexing engine. Thanks to Solr, we can easily implement  geolocated full text searches. The only problem is that you need to configure a dedicated Tomcat server. If you do not have these resources, we recommend using pg_search ( with a Postgres database or the old but still valid meta_search ( .

ActiveAdmin ( When it is necessary to set up a back office administration in a short time, here is the right gem. Powerful, fairly customizable, ideal for simple administration interfaces.

Letter opener ( Useful to test sending emails simply by opening them in a browser window .

RSpec ( A perfect gem to test our models in a BDD way.

Capybara ( : In addition to unit test the models, we like to create a suite of acceptance tests. Capybara allows you to test all the application’s user stories relatively quickly.


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