Fix condition to include Schema, using 'ActiveRecord::Base' instead of 'ActiveRecord' solo

Author: tonidas

lib/paperclip/glue.rb

@@ -8,7 +8,7 @@ def self.included(base)
       base.extend ClassMethods
       base.send :include, Callbacks
       base.send :include, Validators
-      base.send :include, Schema if defined? ActiveRecord
+      base.send :include, Schema if defined? ActiveRecord::Base
 
       locale_path = Dir.glob(File.dirname(__FILE__) + "/locales/*.{rb,yml}")
       I18n.load_path += locale_path unless I18n.load_path.include?(locale_path)