accepts_delimited_id_string_for.rb

module AcceptsDelimtedIdStringFor
  
  # accepts_delimited_id_string_for :careers
  #
  # becomes
  #
  # def career_id_strings=(delimited_string)
  #   self.careers = Career.where(:id => delimited_string.split(",")).all
  # end
  #
  # So...
  # object.career_id_strings = ("1,2,3,4")
  
  def accepts_delimited_id_string_for(*associations)
    associations.each do |association|
      singular = association.to_s.singularize
      klass = singular.classify.constantize
      define_method :"#{singular}_id_strings=" do |delimited_string|
        send(:"#{association}=", klass.where(:id => delimited_string.split(",")).all)
      end
    end
  end
  
end

ActiveRecord::Base.extend(AcceptsDelimtedIdStringFor)