Hello World from OSS Silicon Valley

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  • 1 (2015-09-25 (Fri) 02:09:06)
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_ Prerequisite

• Ruby On Rails installation (You can refer HowToUse/RubyOnRails/4.1)
• PostgreSQL installation (You can refer HowToUse/PostgreSQL/9.3)

_ Install&Setup

Step.1

Check the version of installed postgresql.

$ su - postgres
$ psql --version

Step.2

Install module.

$ sudo apt-get install postgresql-server-dev-9.3

_ HowToUse

Step.1

Create rails project.

$ rails new <project name> --database=postgresql

(Example)

$ rails new sample --database=postgresql

Step.2

Edit Gemfile.

$ vi Gemfile

gem 'therubyracer', platforms: :ruby
...
gem 'execjs'

(You can see sample from here)

Step.3

Install gems.

$ bundle install

Step.4

Update pg_hba.conf from "peer" to "trust" so that other user than postgres can access database as exepected.

$ su - postgres
$ cd /etc/postgres/9.3/main
$ vi pg_hba.conf

local   all             postgres                                trust
local   all             all                                     trust

Step.5

Restart postgres daemon.

$ /etc/init.d/postgres restart

Step.6

Create DB user for application.

$ su - postgres
$ psql -d postgres
postgres=# create role <user_name> login createdb;
postgres=# \q

(Example)

postgres=# create role sample login createdb;

Step.7

Edit database configuration for rails application. Put the same user name as you created in postgres database.

$ vi config/database.yml

default:
  ...
  username: <user_name>

(Example)

  username: sample

(You can see sample from here)

Step.8

Create new controller for welcome page.

(Example)

$ rails generate controller welcome

Step.9

Create welcome page.

(Example)

$ vi app/views/welcome/index.html.erb 

<h2>Hello World</h2>
<p>
<a href="/users">user list</a>
<br>
<%= Time.now %>
</p>

(You can see sample from here)

Step.11

Create User list.

(Example)

$ rails generate scaffold user

Step.10

Config routing setting

$ vi config/routes.rb

root 'welcome#index'

Create and migrate initial database.

$ rake db:create
$ rake db:migrate

Step.9

Check if you can connect database from your rails application's user.

$ rails dbconsole

Step.10

Launch server instance.

$ rails s

You will see the following window.

And also, you can edit user list.

_ Author

S.Yatsuzuka