pages, contents, blurbs

blurb.rb

class Blurb < ActiveRecord::Base
  default_scope :order => 'weight ASC'
  has_many :contents,
           :foreign_key => "blurb_id",
           :dependent => :destroy
  has_many :pages, :through => :contents
end

content.rb

class Content < ActiveRecord::Base
  belongs_to :page
  belongs_to :blurb

  validates_presence_of :page_id, :blurb_id
end

page.rb

class Page < ActiveRecord::Base

  has_many :blurbs,
           :through => :contents
  has_many :contents,
           :foreign_key => "page_id",
           :dependent => :destroy
  validates_presence_of :title
  has_friendly_id :title, :use_slug => true

  def copy!(blurb)
    contents.create!(:blurb_id => blurb.id)
  end

  def copied?(blurb)
    contents.find_by_blurb_id(blurb)
  end
end