Allow ActiveRecord observers to be disabled.

We have to use Observer#update rather than Observer#send since the enabled state is checked in #update before forwarding the method call on.

2 files changed, 13 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/observer.rb b/activerecord/lib/active_record/observer.rb
index 5a5351b517..fdf17c003c 100644
--- a/activerecord/lib/active_record/observer.rb
+++ b/activerecord/lib/active_record/observer.rb
@@ -111,7 +111,7 @@ module ActiveRecord
           callback_meth = :"_notify_#{observer_name}_for_#{callback}"
           unless klass.respond_to?(callback_meth)
             klass.send(:define_method, callback_meth) do |&block|
-              observer.send(callback, self, &block)
+              observer.update(callback, self, &block)
             end
             klass.send(callback, callback_meth)
           end
diff --git a/activerecord/test/cases/lifecycle_test.rb b/activerecord/test/cases/lifecycle_test.rb
index 643e949087..75e5dfa49b 100644
--- a/activerecord/test/cases/lifecycle_test.rb
+++ b/activerecord/test/cases/lifecycle_test.rb
@@ -231,6 +231,18 @@ class LifecycleTest < ActiveRecord::TestCase
     assert_not_nil observer.topic_ids.last
   end
 
+  test "able to disable observers" do
+    observer = DeveloperObserver.instance # activate
+    observer.calls.clear
+
+    ActiveRecord::Base.observers.disable DeveloperObserver do
+      Developer.create! :name => 'Ancestor', :salary => 100000
+      SpecialDeveloper.create! :name => 'Descendent', :salary => 100000
+    end
+
+    assert_equal [], observer.calls
+  end
+
   def test_observer_is_called_once
     observer = DeveloperObserver.instance # activate
     observer.calls.clear