public function down(Schema $schema)
{
// this down() migration is auto-generated, please modify it to your needs
$usermetadata = $schema->createTable('UserMetadata');
$usermetadata->addColumn('id', 'integer')->setAutoincrement(true);
$usermetadata->addColumn('roles', 'simple_array', array('notnull' => false));
$usermetadata->addColumn('userid', 'integer');
$usermetadata->setPrimaryKey(array('id'));
}