Ruby on Rails - How to delegate to polymorphic associations?

Question

Is it possible to use delegate with has_many or has_one association in a polymorphic model? How does that work?

class Generic < ActiveRecord::Base
    ...

  belongs_to :generable, polymorphic: true

  delegate :file_url, to: :image, allow_nil: true
  delegate :type_cat, to: :cat, allow_nil: true
end

class Image < ActiveRecord::Base
   ...
  has_one :generic, as: generable, dependent: :destroy
end


class Cat < ActiveRecord::Base
   ...
  has_one :generic, as: generable, dependent: :destroy
end

Answer 1

Not sure if this exactly matches what you're looking to do, as it's tough to tell from your example but...

class Generic < ActiveRecord::Base
  ...
  belongs_to :generable, polymorphic: true
  ...
  delegate :common_method, to: :generable, prefix: true
end

class Cat
  def common_method
    ...
  end
end

class Image
  def common_method
    ...
  end
end

Allows you to say the following:

generic.generable_common_method