Modeling inheritance with Ruby/Rails ORMs

Question

I\'m trying to model this inheritance for a simple blog system

Blog has many Entries, but they may be different in their nature. I don\'t want to model the

Answer 1

You can handle this easily using ActiveRecord STI. It requires you to have a type field in your Entries table. This way you can define your models like this:

def Blog > ActiveRecord::Base
  has_many :entries

  def articles
    entries.where('Type =', 'Article')
  end

  def quotes
    entries.where('Type =', 'Quote')
  end

  def medias
    entries.where('Type =', 'Media')
  end

end

def Entry > ActiveRecord::Base
  belongs_to :blog
end

def Article > Entry
end

def Quote > Entry
end

def Media > Entry
end