Ruby on Rails - Installation

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
We assume that you already have installed a Web Server and a Database System on your computer. You can use the WEBrick Web Server, which comes with Ruby. Most websites however use Apache or lightTPD web servers in production.
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.
Let's look at the installation instructions for Rails on Windows and Linux.
Follow the steps given below for installing Ruby on Rails.
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.
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.
Install Rails − With Rubygems loaded, you can install all of Rails and its dependencies using the following command through the command line −
C:\> gem install rails

Note − The above command may take some time to install all dependencies. Make sure you are connected to the internet while installing gems dependencies.
Use the following command to check the rails version.
C:\> rails -v

Output
Rails 4.2.4

Congratulations! You are now on Rails over Windows.
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.
Follow the steps given below to install Ruby on Rails using rbenv tool.
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

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

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

Use the following command for setting up the current Ruby version as default.
tp> rbenv global 2.2.3

Use the following command to verify the Ruby version.
tp> ruby -v

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

Ruby provides a keyword gem for installing the supported dependencies; we call them gems. If you don't want to install the documentation for Ruby-gems, then use the following command.
tp> echo "gem: --no-document" > ~/.gemrc

Thereafter, it is better to install the Bundler gem, because it helps to manage your application dependencies. Use the following command to install bundler gem.
tp> gem install bundler

Use the following command for installing Rails version 4.2.4.
tp> install rails -v 4.2.4

Use the following command to make Rails executable available.
tp> rbenv rehash

Use the following command for checking the rails version.
tp> rails -v

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.
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

Use the following command for installing the Node.js package.
tp> sudo yum install nodejs

Congratulations! You are now on Rails over Linux.
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

Accept the prompt, by responding with a y. Use the following command to create a PostgreSQl database cluster.
tp> sudo postgresql-setup initdb

Use the following command to start and enable PostgreSQL.
tp> sudo systemctl start postgresql
tp> sudo systemctl enable postgresql

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

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

Output
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

It will generate auto-code to start the server
Now open your browser and type the following −
http://localhost:3000

It should display a message, something like, "Welcome aboard" or "Congratulations".
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