devblog/app/models/article.rb

class Article < ActiveRecord::Base
  
  before_create :b_create
  before_update :b_update
  before_destroy :b_destroy
  
  def b_create
    self.rate = 0.0
  end

  def b_destroy
    #ToDo destroy comments
  end
  
  def self.created
    "#{self.email} (#{self.created_at})"
  end
end