Question

I have Advertisements which can have ladyies, but only if the type is a “club”.

Is there a rails-way to do that? especially with not creating lady objects?
Do I have to check a lady object, before creating, if her parent is type=club?

class Advertisement < ActiveRecord::Base

  validates_inclusion_of :type, in: %w(club lady)

  has_many :ladies, :dependent=>:destroy

  #only have ladies if the club =
  def ladies 
    return nil unless type == "club"
    super    
  end

end

I’m using Rails 3.2.

Answer 1

The Rails way to do that is STI:

 class Advertisement < ActiveRecord::Base
 end

 class LadyAd < Advertisement
   has_many :ladies, :dependent=>:destroy
 end

And only LadyAd object able to have ladies.