gistfile1.rb

#user.rb 


class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me
  # attr_accessible :title, :body

  has_many :apps, :campaigns
end

#app.rb
class App < ActiveRecord::Base
  attr_accessible :name, :promo_code_list, :user_id
  has_many :campaigns
  has_many :promo_codes
  belongs_to :user
end

#campaign.rb 
class Campaign < ActiveRecord::Base
  belongs_to :app
  attr_accessible :name, :app_id, :promo_code_count
end

#campaigns_controller.rb 

class CampaignsController < ApplicationController
  # GET /campaigns
  # GET /campaigns.json
  before_filter :authenticate_user!

  def index
      @campaigns = Campaign.all
  end
end