fix callbacks in ruby 2.0

Change-Id: I49aa8b21eb6183a5b71b55e81e775bc0217d65f3
Reviewed-on: https://gerrit.instructure.com/26965
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

config/initializers/rails2.rb

@@ -303,4 +303,20 @@ ActiveRecord::Associations::HasManyThroughAssociation.class_eval do
   alias_method_chain :construct_scope, :has_many_fix
 end
 
+# in ruby 2.0, respond_to? returns false for protected methods; Rails 2 doesn't know this,
+# so replace this method with that knowledge
+ActiveRecord::Callbacks.class_eval do
+  def callback(method)
+    result = run_callbacks(method) { |result, object| false == result }
+
+    if result != false && respond_to_without_attributes?(method, true)
+      result = send(method)
+    end
+
+    notify(method)
+
+    return result
+  end
+end
+
 end