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<?php
trait MvvReplaceDataFieldsTrait
{
/**
* The id of the section (Studiengangteil-Abschnitt) with replaced or
* added fields (defined as data fields) in all related objects.
*
* @var string|null $replace_df_abschnitt_id
*/
private string|null $replace_df_abschnitt_id = null;
/**
* Set the section (Studiengangteil-Abschnitt) with replaced or
* added fields (defined as data fields) for all related objects.
*
* @param Stgteilabschnitt $abschnitt The section.
* @return int The number of objects related to the given section.
*/
public function setReplaceDfAbschnitt(Stgteilabschnitt $abschnitt): int
{
$this->replace_df_abschnitt_id = $abschnitt->id;
return 1;
}
/**
* Returns the replaced value for the given field and section id.
*
* @param string $field
* @param string|null $abschnitt_id
* @return string
*/
public function getReplacedValue(
string $field,
?string $abschnitt_id = null
): string
{
$abschnitt_id = $abschnitt_id ?? $this->replace_df_abschnitt_id;
if (is_null($abschnitt_id)) {
return $this->getValue($field) ?? '';
}
if (!in_array($field, array_keys(static::db_fields()))) {
throw new InvalidArgumentException(static::class . '::' . $field . ' not found.');
}
// find data field that replaces the given local field
$data_field_id = static::getReplaceDataFieldsId($field, $this->abschnitt_assignments->getClassName());
if ($data_field_id) {
$abschnitt = $this->abschnitt_assignments->findOneBy('abschnitt_id', $abschnitt_id);
if (!$abschnitt) {
return $this->getValue($field) ?? '';
}
$data_field = $abschnitt->datafields->findOneBy('datafield_id', $data_field_id);
if (mb_strlen($data_field->getValue('content'))) {
$tdf = $data_field->getTypedDatafield();
return $tdf->getDisplayValue();
}
}
return $this->getValue($field) ?? '';
}
/**
* Retrieves the id of the related data field.
*
* @param string $field The field to search for a related data field.
* @param string $related_class The name of the related class.
* @return string|null The id of the data field. Null if no related data field.
*/
private static function getReplaceDataFieldsId(
string $field,
string $related_class
): string|null
{
static $data_fields = null;
if (is_null($data_fields)) {
DataField::findEachBySQL(
function (DataField $f) use (&$data_fields) {
$data_fields[$f->object_class] = $f->datafield_id;
},
"`object_type` = ? AND `object_class` IN(?)",
[
strtolower($related_class),
array_keys(static::db_fields())
]
);
$data_fields = $data_fields ?: [];
}
return $data_fields[$field] ?? null;
}
}
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