add_delete.rb

# http://gist.github.com/343293
# it's for rails 1.2.5 
# add require 'add_delete.rb' in environment.rb

class ActiveRecord::Base
  def delete!
    unless new_record?
      affected_rows = connection.delete("DELETE FROM `#{self.class.table_name}` WHERE #{connection.quote_column_name(self.class.primary_key)} = #{quoted_id}", "#{self.class.name} Destroy")

      unless affected_rows == 1
        raise ActiveRecord::StaleObjectError, "Attempted to delete a stale object"
      end
    end
  end

end