Installing

Install Dependencies

sudo apt update
sudo apt install -y curl gnupg2 dirmngr git-core zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev software-properties-common libffi-dev

Install Node

curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
sudo apt install -y nodejs

Install Yarn

curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
sudo apt update && sudo apt install -y  yarn

Install Ruby

Takes a while so might want to add --verbose

 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 2.7.1
 rbenv global 2.7.1
 gem install bundler

Install Rails

 gem install rails

Creating a Project

This took a while but did finish on version 6.0.3.2 of rails

# Create 
rails new HU
# Start the server http://localhost:3000
rails server # rails s

Basics

Creating a Controller

You pass a name and an action to create a controller

rails generate controller home index

We can not change the content of the page which is found at app/views/home/index.html.erb

<h1>Welcome</h1>

Changing the default route

Lets change the default route page to be the new page. Go app/config/routes.rb
Change from

Rails.application.routes.draw do
  get 'home#index'
  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end

Change to

Rails.application.routes.draw do
  root 'home#index'
  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end

Adding a new route

Add Route

In app/config/routes.rb add a new route by adding a get with route name and a controller and action

get '/about' => 'home#about'

Add View

You will need a new view under app/views called about.html.erb

<h1>Abouty<h1>

Add Action

You will need a new action under app/controller/home_controller.rb

class HomeController < ApplicationController
...
  def about
  end
end

Layouts

Hooking up Bootstrap

We can add bootstrap to our project by going to app/views/layouts/application.html.erb and adding the min to it. Add the link from https://getbootstrap.com/docs/4.0/getting-started/download/ and add the container div around the body

<!DOCTYPE html>
<html>
  <head>
    <title>HU</title>

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
...    
  </head>

  <body>
    <div class="container">
    <%= yield %>
    </div>
  </body>
</html>

Adding a NavBar

We can do this by going to the bootstrap page and grab the example at the time this was

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

Adding content to the page

Next to go the index page and add a few of the following

<ul class="list-unstyled">
  <li class="media">
    <img class="mr-3" src="http://www.gravatar.com/avatar/424242" alt="Generic placeholder image">
    <div class="media-body">
      <h5 class="mt-0 mb-1">user@email.com asked:</h5>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Dolore, expedita. Ullam voluptatem suscipit, modi corrupti assumenda fugiat a qui ex dolorum, architecto nulla quia accusantium, vitae consectetur cum doloribus debitis.

      <div>
        <a href="/questions/12" class="btn btn-success btn-xs">View Answers</a>
      </div>      
    </div>
  </li>
...
</ul>

Ruby On Rails

Contents