ruby-on-rails-5 Getting started with ruby-on-rails-5

Remarks

Creating your first hello world page

Create a new rails app hello-world from command in Windows and Terminal in Linux.

rails new hello-world
 

Now move to new app directory

cd hello-world
 

Now generate a controller

rails generate controller hello_world index
 

Here index is the name of method in hello_world controller. You can check it opening the file app/controllers/hello_world_controller.rb in your application directory. Code looks like this:

class HelloWorldController < ApplicationController
  def index
  end
end
 

A route is automatically added in your config/routes.rb file which points to your method. See the code in your routes.rb file.

    Rails.application.routes.draw do
      get 'hello_world/index'

      # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
   end
 

Now open file app/views/hello_world/index.html.rb Clear all the content and write

Hello, this is my first rails page.

Start rails server:

rails server
 

Open this url in your browser:

http://localhost:3000/hello_world/
 

You should see:

Hello, this is my first rails page
 

Make your new page, your home page. In routes.rb file in config folder remove the line get 'hello_world/index' and add:

root 'hello_world#index'
 

Now open: http://localhost:3000/ You will see: Hello, this is my first rails You are done.

Installation or Setup

In windows Platform

Step 1: Installation of Ruby

If you already have installed ruby in your pc then you can skip this step.

• Go to rubyinstaller.org's download page and download one of the stable version of ruby corresponding to architecture of your windows platform.
• Again download development kit for your ruby version form here.
• Now install ruby.
• This is the time to enhance your ruby installation with ruby development kit. This is required by some of the gems to compile in your pc.
• Extract your ruby develpment kit file in a folder near your ruby installation path C:\Ruby-** . For example C:\rubyDevkit .
• Now open cmd.exe and move to the directory where you extracted your devkit.
• Then run this command ruby dk.rb init . This will initialize your installation. Then run ruby dk.rb install .

Step 2: Install Rails

• fter successful installation of ruby. Next step is to install rails. Before installing rails install bundler gem running gem install bundler from your command prompt window.

• After installing bundler now run gem install rails -v version_of_rails for example -v 5.0.0.1 .

• If all process are completed without error then you installed rails successfully.

Setup Ruby On Rails on Ubuntu 17.04 Zesty Zapus

This will take about 30 minutes. We will be setting Ruby on Rails Development Environment on Ubuntu 16.10 Yakkety Yak.
You'll want to download the latest Desktop version here: http://releases.ubuntu.com/17.04/

Open up your terminal using Ctrl + Alt + T.

Installing Ruby

---

The First step is to install Dependencies For Ruby.

sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev nodejs
 

We will be using Ruby version 2.4.0 and it is recommended. Install Ruby using one of the three methods. Each have their own benefits, mostly people prefer rbenv but if you are familiar with rvm then go for it.

Note: Only rbenv users need to run rbenv rehash after installing bundler .

Installing with rbenv :

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

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

rbenv install 2.4.0
rbenv global 2.4.0
ruby -v
 

Then install Bundler:

gem install bundler
 

Use rbenv rehash after installing bundler.

Installing with rvm :

sudo apt-get install libgdbm-dev libncurses5-dev automake libtool bison libffi-dev
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
curl -sSL https://get.rvm.io | bash -s stable
source ~/.rvm/scripts/rvm
rvm install 2.4.0
rvm use 2.4.0 --default
ruby -v
 

Then install Bundler:

gem install bundler
 

Installing with source:

cd
wget http://ftp.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.gz
tar -xzvf ruby-2.4.0.tar.gz
cd ruby-2.4.0/
./configure
make
sudo make install
ruby -v
 

Then Last step is to install Bundler:

gem install bundler
 

Installing Rails

---

Rails ships with so many dependencies these days, we're going to need to install a JavaScript run-time like NodeJS. This lets you use Coffee-script and the Asset Pipeline in Rails which combines and minifies your JavaScript to provide a faster production environment.

Install NodeJS using the official repository:

curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash -
sudo apt-get install -y nodejs
 

Now install Rails 5.0.1 :

gem install rails -v 5.0.1
 

If you are using rbenv then run the following command to make rails executable available:

 rbenv rehash
 

Now Rails is Installed, Run rails -v to make sure rails installed properly:

rails -v
# Rails 5.0.1
 

If you are getting a different result for some reason, it means that your environment may not be setup properly.

---

Setting Up PostgreSQL

Rails ships with sqlite3 as the default database. Chances are you won't want to use it because it's stored as a simple file on disk. You'll probably want something more robust like MySQL or PostgreSQL.

There is a lot of documentation on both, so you can just pick one that seems like you'll be more comfortable with.

sudo sh -c "echo 'deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main' > /etc/apt/sources.list.d/pgdg.list"
wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-common
sudo apt-get install postgresql-9.5 libpq-dev
 

PostgreSQL installation doesn't setup a user for you, so you'll need to follow these steps to create a user with permission to create databases. Feel free to replace Hizqeel with your username.

sudo -u postgres createuser hizqeel -s

# If you would like to set a password for the user, you can do the following
sudo -u postgres psql
postgres=# \password hizqeel