public function builder($fieldName = null)
{
if ($fieldName === null) {
return $this;
} else {
if (isset($this->map[$fieldName])) {
return $this->map[$fieldName];
}
}
return ScalarFields::getInstance();
}
/**
* Convert given array into fields.
*
* @param array $input
* @return FieldsBuilderInterface
*/
public static function fromArray($input = [])
{
$fields = ScalarFields::getInstance();
foreach ($input as $k => $v) {
if (is_array($v)) {
$fields = $fields->appendFields($k, self::fromArray($v));
} elseif (!!$v) {
$fields = $fields->appendField($k);
}
}
return $fields;
}