Shorten migration roll-back also

lib/paperclip/railtie.rb

@@ -23,6 +23,7 @@ module Paperclip
 
       Paperclip.options[:logger] = defined?(ActiveRecord) ? ActiveRecord::Base.logger : Rails.logger
 
+      ActiveRecord::ConnectionAdapters::AbstractAdapter.send(:include, Paperclip::Schema)
       ActiveRecord::ConnectionAdapters::Table.send(:include, Paperclip::Schema)
       ActiveRecord::ConnectionAdapters::TableDefinition.send(:include, Paperclip::Schema)
     end

lib/paperclip/schema.rb

@@ -6,5 +6,12 @@ module Paperclip
       column :"#{name}_file_size",    :integer
       column :"#{name}_updated_at",   :datetime
     end
+
+    def drop_attached_file(table_name, name)
+      remove_column table_name, :"#{name}_file_name"
+      remove_column table_name, :"#{name}_content_type"
+      remove_column table_name, :"#{name}_file_size"
+      remove_column table_name, :"#{name}_updated_at"
+    end
   end
 end