Yield the payload notifications for further modification (like adding the result).

activeresource/lib/active_resource/connection.rb

@@ -106,9 +106,9 @@ module ActiveResource
     private
       # Makes a request to the remote service.
       def request(method, path, *arguments)
-        result = ActiveSupport::Notifications.instrument!("active_resource.request",
-          :method => method, :path => path, :site => site) do
-          http.send(method, path, *arguments)
+        result = ActiveSupport::Notifications.instrument("active_resource.request",
+          :method => method, :path => path, :site => site) do |payload|
+          payload[:result] = http.send(method, path, *arguments)
         end
         handle_response(result)
       rescue Timeout::Error => e

activesupport/lib/active_support/notifications.rb

@@ -45,7 +45,7 @@ module ActiveSupport
     class << self
       attr_writer :notifier
       delegate :publish, :subscribe, :to => :notifier
-      delegate :instrument, :instrument!, :to => :instrumenter
+      delegate :instrument, :to => :instrumenter
 
       def notifier
         @notifier ||= Notifier.new

activesupport/lib/active_support/notifications/instrumenter.rb

@@ -13,19 +13,13 @@ module ActiveSupport
 
       # Instrument the given block by measuring the time taken to execute it
       # and publish it.
-      def instrument(name, payload={}, add_result=false)
+      def instrument(name, payload={})
         time = Time.now
-        result = yield if block_given?
-        payload.merge!(:result => result) if add_result
+        result = yield(payload) if block_given?
         @notifier.publish(name, time, Time.now, @id, payload)
         result
       end
 
-      # The same as instrument, but adds the result as payload.
-      def instrument!(name, payload={}, &block)
-        instrument(name, payload, true, &block)
-      end
-
       private
         def unique_id
           SecureRandom.hex(10)

activesupport/test/notifications_test.rb

@@ -90,8 +90,8 @@ module Notifications
       drain
     end
 
-    def test_instrument_with_band_adds_result_to_payload
-      assert_equal 2, instrument!(:awesome) { 1 + 1 }
+    def test_instrument_yields_the_paylod_for_further_modification
+      assert_equal 2, instrument(:awesome) { |p| p[:result] = 1 + 1 }
       drain
 
       assert_equal 1, @events.size