gistfile1.rb

class Blog
  attr_reader :entries
  attr_accessor :post_class

  def initialize
    @entries = []
  end

  def title
    "Underwater Basketweaving"
  end

  def subtitle
    "The best way to spend your time, all the time"
  end

  def new_post
    post = (post_class || Post).new
    post.blog = self

    post
  end
end