Expose Instrumenter id in Notifications.

2 files changed, 6 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/notifications/instrumenter.rb b/activesupport/lib/active_support/notifications/instrumenter.rb
index 0655dd0cb6..3b0b0d8da2 100644
--- a/activesupport/lib/active_support/notifications/instrumenter.rb
+++ b/activesupport/lib/active_support/notifications/instrumenter.rb
@@ -4,6 +4,8 @@ require 'active_support/core_ext/module/delegation'
 module ActiveSupport
   module Notifications
     class Instrumenter
+      attr_reader :id
+
       def initialize(notifier)
         @id = unique_id
         @notifier = notifier
diff --git a/activesupport/test/notifications_test.rb b/activesupport/test/notifications_test.rb
index 3ba77ae135..ef6e6d8d22 100644
--- a/activesupport/test/notifications_test.rb
+++ b/activesupport/test/notifications_test.rb
@@ -86,6 +86,10 @@ module Notifications
       assert_equal 2, @notifier.instrument(:awesome) { 1 + 1 }
     end
 
+    def test_instrumenter_exposes_its_id
+      assert_equal 20, ActiveSupport::Notifications::Instrumenter.new(@notifier).id.size
+    end
+
     def test_nested_events_can_be_instrumented
       @notifier.instrument(:awesome, :payload => "notifications") do
         @notifier.instrument(:wot, :payload => "child") do