# File lib/new_relic/agent/instrumentation/data_mapper.rb, line 99
      def self.add_tracer(clazz, method_name, operation_only = false)
        clazz.class_eval do
          if method_defined?(method_name) || private_method_defined?(method_name)
            define_method("#{method_name}_with_newrelic",
                          NewRelic::Agent::DataMapperTracing.method_body(clazz, method_name, operation_only))

            alias_method "#{method_name}_without_newrelic", method_name
            alias_method method_name, "#{method_name}_with_newrelic"
          end
        end
      end