public static function listColumn($table) {
		if (is_string($table)) $table = config('center.tables.' . $table);
		$fields = !empty($table->list) ? $table->list : array_keys((array) $table->fields);
		foreach ($fields as $field) {
			if ($table->fields->{$field}->type == 'string') return $field;
		}
	}