I am writing a plugin, in which i define a new relation dynamically with in plugin. Sample code is given below

module AttachDocumentsAs
   @as = nil
   def attach_documents_as(*attachment_as)
      attachment_as = attachment_as.to_a.flatten.compact.map(&:to_sym)
      @as           = attachment_as.first
      class_inheritable_reader(@as)

      class_eval do
          has_many @as, :as => :attachable, :class_name=>"AttachDocuments::Models::AttachedDocument"
          accepts_nested_attributes_for @as
      end 
   end
end

now in any model i used it as

class Person < AtiveRecord::Base
    attach_documents_as :financial_documents
end

Now want to access want to access this attribute of the class in overloaded initialize method like this

def initialize(*args)
   super(*args)
   "#{@as}".build 
end

But it is not getting required attribute, can any one help me in it. I want to build this relation and set some initial values.

Waiting for guidelines from all you guys.