Hello World from OSS Silicon Valley

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_ Prerequisite

• Ubuntu Server (You can refer Overall/UbuntuServer)
• RVM (You can refer Overall/RVM)

_ Install&Setup

Step.1

Check if the rails has already been installed.

$ rails --version

Step.2

If the rails has not been installed yet, execute the following command

$ gem install rails

_ HowToUse

_ Create new application

Step.1

Create new application.

$ rails new <Application Name>

Step.2| Open the Gemfile and append the following lines.

$ vi Gemfile

gem ‘execjs’
gem ‘therubyracer’

$ bundle install

Step.3

Launch application.

$ cd <Application Name>
$ rails server

Step.4

Access the following page.

http://localhost:3000/

_ Create sample program with Scaffold

Step.1

Create objects withs scaffold.

$ rails generate scaffold <Object Name>

(Example)

$ rails generate scaffold scaffold_test

Step.2

Prepare database.

$ rake db:migrate

Step.3

Launch the server and access http://<IP address>:3000/<Object Name>

Now you have a page which maintains data stored in Sqlite DB.

_ Create Say Hello program

Step.1

Create controller and view files.

$ rails generate controller <Controller Name> <Method(View)> <Method(View)>

(Example)

$ rails generate controller Say hello goodbye

Step.2

Access the following page.

http://localhost:3000/say/hello/

#ref(): File not found: "CreateApplication_fig2.png" at page "HowToUse/RubyOnRails/4.1"

_ Get data from RESTful service

Step.1

Edit controller.

$ vi app/controller/<Controller file>

   require 'open-uri'
   require 'json'

   res = open('<URL>')
   code, message = res.status

   if code == '200'

     @result = JSON.parse(res.read)
   end 

Step.2

Put it to view file.

$ vi app/view/<View file>

<table>
<% @result.each do |data| %>
 <tr>
 <td><%= data['<Key#1>'] %></td>
 <td><%= data['<Key#2>'] %></td>
 </tr>
<% end %>
</table>

_ Upload to Heroku

Step.1

Create new account in Heroku (https://id.heroku.com/login)

Step.2

Install Ruby 2.2.2

$ rvm install ruby-2.2.2

Step.3

Install Heroku Toolbelt.

$ wget -O- https://toolbelt.heroku.com/install-ubuntu.sh | sh

When you encounter error, you can use standalone edition with the following commands.

$ wget -qO- https://toolbelt.heroku.com/install.sh | bash
$ echo 'PATH="/usr/local/heroku/bin:$PATH"' >> ~/.profile

Step.4

Login to Heroku

$ heroku login

Step.5

Prepare Git repository.

$ git clone <Git Repository>

or

$ cd <Ruby On Rails Project>
$ git init
$ git add .
$ git commit -m "initial commit"

Step.6

Edit Gemfile because Heroku doesn't allow sqlite3, but PostgreSQL

$ vi config/Gemfile

+gem 'pg'
-gem 'sqlite3'
+gem 'sqlite3', group: %w(test development), require: false
+gem 'pg', group: %w(production), require: false

Step.7

Install gem file.

$ bundle install

Step.8

Edit database.yml

$ vi db/database.yml

production:
  <<: *default
-  database: db/production.sqlite3
+  adapter: pg
+  database: db/production.pg

Step.9

Create application in Heroku

$ heroku create <application name>

Step.10

Push files.

$ git push heroku master

_ Author

S.Yatsuzuka