if defined?(ActiveRecord::Base)
  module Spec
    module Matchers
      class Change
        def evaluate_value_proc_with_ensured_evaluation_of_proxy
          value = evaluate_value_proc_without_ensured_evaluation_of_proxy
          ActiveRecord::Associations::AssociationProxy === value ? value.dup : value
        end
        alias_method_chain :evaluate_value_proc, :ensured_evaluation_of_proxy
      end
    end
  end
end