Allow observers to be enabled and disabled.

This is useful in situations like model unit tests and the occasional rake task to backfill old data.

1 files changed, 27 insertions, 0 deletions

diff --git a/activemodel/test/models/observers.rb b/activemodel/test/models/observers.rb
new file mode 100644
index 0000000000..3729b3435e
--- /dev/null
+++ b/activemodel/test/models/observers.rb
@@ -0,0 +1,27 @@
+class ORM
+  include ActiveModel::Observing
+
+  def save
+    notify_observers :before_save
+  end
+
+  class Observer < ActiveModel::Observer
+    def before_save_invocations
+      @before_save_invocations ||= []
+    end
+
+    def before_save(record)
+      before_save_invocations << record
+    end
+  end
+end
+
+class Widget < ORM; end
+class Budget < ORM; end
+class WidgetObserver < ORM::Observer; end
+class BudgetObserver < ORM::Observer; end
+class AuditTrail < ORM::Observer
+  observe :widget, :budget
+end
+
+ORM.instantiate_observers