Use ancestors instead of manually walking the superclass chain.

lib/ap/mixin/active_record.rb

@@ -18,7 +18,7 @@ def printable_with_active_record(object)
       if object.is_a?(ActiveRecord::Base)
         printable = :active_record_instance
       end
-    elsif printable == :class and class_inherits_from(object, ActiveRecord::Base)
+    elsif printable == :class and object.ancestors.include?(ActiveRecord::Base)
       printable = :active_record_class
     end
     printable
@@ -48,13 +48,6 @@ def awesome_active_record_class(object)
     end
   end
 
-  private
-  def class_inherits_from(klass, parent_class)
-    while klass do
-      return true if klass == parent_class
-      klass = klass.superclass
-    end
-  end
 end
 
 AwesomePrint.send(:include, AwesomePrintActiveRecord)