gistfile1.rb

class Post < ActiveRecord::Base
  before_save :published_at_value

  private

# TODO: Needs Refactoring
  def published_at_value
    if self.published == true and self.published_at.nil? == true
      self.published_at = Time.now
    elsif self.published == false
      self.published_at = nil
    elsif self.published == true and self.published_at.nil? == false
      self.published_at = published_at
    end
  end
end