instance method translate_exception

# File activerecord/lib/active_record/connection_adapters/mysql_adapter.rb, line 601
        def translate_exception(exception, message)
          return super unless exception.respond_to?(:errno)

          case exception.errno
          when 1062
            RecordNotUnique.new(message, exception)
          when 1452
            InvalidForeignKey.new(message, exception)
          else
            super
          end
        end