First naive implementation of Article model.

article.rb

class Article < ActiveRecord::Base
  include Categorizable

  APPROVED = 'approved'
  PENDING = 'pending'
  REJECTED = 'rejected'

  attr_accessible :approved_at, :url, :body, :image, :rating, :state, :title

  validates :url, :uniqueness => true
  validates :rating, :inclusion => { :in => (0..10) }
  validates :title, :presence => true

  mount_uploader :image, PhotoUploader

  belongs_to :news_source

  def self.pending
    where state: PENDING
  end

  def self.approved
    where state: APPROVED
  end

  def approve
    self.state = APPROVED
    self.approved_at = DateTime.now
  end

  def reject
    self.state = REJECTED
    self.approved_at = nil
  end

  def enqueue
    self.state = PENDING
    self.approved_at = nil
  end

  #####
  # ...
  # The rest of the methods ommited
  # ...
  #####

end