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class Testing < ActiveRecord::Base
  rating_for :room_service
end

 NoMethodError in Admin::TestingsController#destroy

undefined method `association_class' for nil:NilClass

activerecord (3.1.10) lib/active_record/associations.rb:164:in `association'
activerecord (3.1.10) lib/active_record/associations/builder/has_one.rb:49:in `has_one_dependent_delete_for_rating_for_room_service'
activesupport (3.1.10) lib/active_support/callbacks.rb:395:in `_run_destroy_callbacks'
activesupport (3.1.10) lib/active_support/callbacks.rb:81:in `run_callbacks'
activerecord (3.1.10) lib/active_record/callbacks.rb:254:in `destroy'
activerecord (3.1.10) lib/active_record/transactions.rb:236:in `block in destroy'
activerecord (3.1.10) lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status'
activerecord (3.1.10) lib/active_record/connection_adapters/abstract/database_statements.rb:194:in `transaction'
activerecord (3.1.10) lib/active_record/transactions.rb:208:in `transaction'
activerecord (3.1.10) lib/active_record/transactions.rb:293:in `with_transaction_returning_status'
activerecord (3.1.10) lib/active_record/transactions.rb:236:in `destroy'

def averge_rating=(value)
    self.avg_rating = value
end