• To develop a web application using Ruby on Rails Framework, you need to install the following software −

• Ruby
• The Rails Framework
• A Web Server
• A Database System

• Rails works with many database systems, including MySQL, PostgreSQL, SQLite, Oracle, DB2 and SQL Server. Please refer to a corresponding Database System Setup manual to set up your database.

Rails Installation on Windows

Step 1: Check Ruby Version

• First, check if you already have Ruby installed. Open the command prompt and type ruby -v. If Ruby responds, and if it shows a version number at or above 2.2.2, then type gem --version. If you don't get an error, skip Install Ruby step. Otherwise, we'll install a fresh Ruby.

Step 2: Install Ruby

• If Ruby is not installed, then download an installation package from rubyinstaller.org . Follow the download link, and run the resulting installer. This is an exe file rubyinstaller-2.2.2.x.exe and will be installed in a single click. It's a very small package, and you'll get RubyGems as well along with this package. Please check the Release Notes for more detail.

Step 3: Install Rails

• Install Rails − With Rubygems loaded, you can install all of Rails and its dependencies using the following command through the command line −

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Step 4: Check Rails Version

C:\> rails -v

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Output

Rails 4.2.4

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Rails Installation on Linux

• We are installing Ruby On Rails on Linux using rbenv. It is a lightweight Ruby Version Management Tool. The rbenv provides an easy installation procedure to manage various versions of Ruby, and a solid environment for developing Ruby on Rails applications.

Step 1: Install Prerequisite Dependencies

• First of all, we have to install git - core and some ruby dependences that help to install Ruby on Rails. Use the following command for installing Rails dependencies using yum.

tp> sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel

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Step 2: Install rbenv

• Now we will install rbenv and set the appropriate environment variables. Use the following set of commands to get rbenv for git repository.

tp> git clone git://github.com/sstephenson/rbenv.git .rbenv
tp> echo 'export PATH = "$HOME/.rbenv/bin:$PATH"' >> ~/.bash_profile
tp> echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
tp> exec $SHELL

tp> git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build
tp> echo 'export PATH = "$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' << ~/.bash_profile
tp> exec $SHELL

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Step 3: Install Ruby

• Before installing Ruby, determine which version of Ruby you want to install. We will install Ruby 2.2.3. Use the following command for installing Ruby.

tp> rbenv install -v 2.2.3

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• Use the following command for setting up the current Ruby version as default.

tp> rbenv global 2.2.3

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• Use the following command to verify the Ruby version.

tp> ruby -v

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Output

ruby 2.2.3p173 (2015-08-18 revivion 51636) [X86_64-linux]

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Step 4: Install Rails

• Use the following command for installing Rails version 4.2.4.

tp> install rails -v 4.2.4

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• Use the following command to make Rails executable available.

tp> rbenv rehash

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• Use the following command for checking the rails version.

tp> rails -v

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Output

tp> Rails 4.2.4

• Ruby on Rails framework requires JavaScript Runtime Environment (Node.js) to manage the features of Rails. Next, we will see how we can use Node.js to manage Asset Pipeline which is a Rails feature.

Step 5: Install JavaScript Runtime

• Let us install Node.js from the Yum repository. We will take Node.js from EPEL yum repository. Use the following command to add the EPEL package to the yum repository

tp> sudo yum -y install epel-release

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• Use the following command for installing the Node.js package.

tp> sudo yum install nodejs

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Step 6: Install Database

• By default, Rails uses sqlite3, but you may want to install MySQL, PostgreSQL, or other RDBMS. This is optional; if you have the database installed, then you may skip this step and it is not mandatory that you have a database installed to start the rails server. For this tutorial, we are using PostgreSQL database. Therefore use the following commands to install PostgreSQL.

tp> sudo yum install postgresql-server postgresql-contrib

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• Accept the prompt, by responding with a y. Use the following command to create a PostgreSQl database cluster.

tp> sudo postgresql-setup initdb

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• Use the following command to start and enable PostgreSQL.

tp> sudo systemctl start postgresql
tp> sudo systemctl enable postgresql

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Keeping Rails Up-to-Date

• Assuming you have installed Rails using RubyGems, keeping it up-to-date is relatively easy. We can use the same command in both Windows and Linux platform. Use the following command −

tp> gem update rails

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Output

• The following screenshot shows a Windows command prompt. The Linux terminal also provides the same output.

Learn Ruby on Rails - Ruby on Rails tutorial - rails upto date - Ruby on Rails examples - Ruby On Rails programs

• This will automatically update your Rails installation. The next time you restart your application, it will pick up this latest version of Rails. While using this command, make sure you are connected to the internet.

Installation Verification

• You can verify if everything is set up according to your requirements or not. Use the following command to create a demo project.

tp> rails new demo

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Output

Learn Ruby on Rails - Ruby on Rails tutorial - rails install verification - Ruby on Rails examples - Ruby On Rails programs

• It will generate a demo rail project; we will discuss about it later. Currently we have to check if the environment is set up or not. Next, use the following command to run WEBrick web server on your machine.

tp> cd demo
tp> rails server

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Instant Ruby on Rails Installation

Go to http://rubyforge.org/projects/instantrails/

Unzip Instant Rails on any hard drive

Start server Apache and MySQL

Install it by, Go to command prompt by using helper command as follow: C:\InstantRails>use_ruby

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ROR Web Servers :

Rails will try to use Mongrel and lighttpd if they are installed, otherwise Rails will use WEBBrick, the webserver that ships with ruby.

Windows users are encouraged to Start with Mongrel because it is a Ruby-based webserver that is suitable for development and deployment of Rails applications.

ROR Databases :

Mysql

Oracle

Postgre Sql

SqlLite

And more…

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