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installing postgresql 9.3.2 on ubuntu 12.04

follow official guide

$ echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" > /etc/apt/sources.list.d/pgdg.list
$ wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
$ sudo apt-get update
$ sudo apt-get install postgresql-9.3 postgresql-contrib-9.3

you should succesfully installing postgresql 9.3.2 on your machine.

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# rubocop config files for small Rails4/Ruby2 project
# blog post: http://joanswork.com/rubocop-rails-getting-started/

# .rubocop.yml

AllCops:
  Include:
    - Rakefile
    - config.ru
  Exclude:

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# replace file basename with a UUID when uploaded
# e.g.: avatar.jpg becomes 41bf830f-80cf-4efe-ad90-3b29bc6708b5.jpg
# but don't regenerate a UUID each time file url is accessed
class User < ActiveRecord::Base
  has_attached_file :avatar, path: ":basename.:extension"

  before_validation { set_avatar_file_name }

  def set_avatar_file_name
    # replace any NEW filename with a UUID

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#! /bin/bash
### BEGIN INIT INFO
# Provides:            redis-server
# Required-Start:      $remote_fs $syslog
# Required-Stop:       $remote_fs $syslog
# Should-Start:        $local_fs
# Should-Stop:         $local_fs
# Default-Start:       2 3 4 5
# Default-Stop:        0 1 6
# Short-Description:   redis-server - Persistent key-value db

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# encoding: utf-8
class TagSpec
  attr_reader :tag
  attr_accessor :result

  def initialize(tag)
    @tag = tag
  end

  def match?(tag_collection)

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#!/bin/sh
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals

# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=$(pwd)
PID=$APP_ROOT/tmp/pids/unicorn.pid
CMD="bundle exec unicorn_rails  -D -c $APP_ROOT/config/unicorn.rb"

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# See http://unicorn.bogomips.org/Unicorn/Configurator.html for complete
# documentation.

# Use at least one worker per core if you're on a dedicated server,
# more will usually help for _short_ waits on databases/caches.
rails_env = ENV["RAILS_ENV"] || "development"
RAILS_ROOT = File.expand_path("../../", __FILE__)

if rails_env == "production"
  worker_processes 2

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# Resize selenium browser window to avoid Selenium::WebDriver::Error::MoveTargetOutOfBoundsError errors
#
# Example usage with Rspec (in spec/support/spec_helper.rb):
#     
#   config.before(:each) do
#     set_selenium_window_size(1250, 800) if Capybara.current_driver == :selenium
#   end
#
def set_selenium_window_size(width, height)
  window = Capybara.current_session.driver.browser.manage.window

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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# http://stackoverflow.com/a/8936202
#
# ActiveAdmin already includes the necessary jquery in active_admin/base,
# so just add this to javascripts/active_admin.js after //= require active_admin/base
# 
# 
# Serialize and Sort 
# 
# model_name - you guessed it, the name of the model we are calling sort on.
#              This is the actual variable name, no need to change it.