Has anyone had any experience of using nested attributes with
polymorphic associations ?  I cannot see how it would work as the
model would need to know the class of the object to create (when
creating a new record for the association).

Here is an example

class MyClass < ActiveRecord::Base
  belongs_to :owner, :polymorphic=>true
  accepts_nested_attributes_for :owner
end

This generates a method called 'owner_attributes=' which is fair
enough, but it does not generate the method 'build_owner' which is
required by the looks of it.

So, if I try using owner_attributes=, then straight away it complains
that the method build_owner is missing.

Regards

Gary Taylor
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