/**
* Load the parent model for the current list.
*
* @param InputProviderInterface $input The input provider.
*
* @param EnvironmentInterface $environment The environment.
*
* @return ModelInterface|null
*/
protected function loadParentModel(InputProviderInterface $input, EnvironmentInterface $environment)
{
if (!$input->hasParameter('pid')) {
return null;
}
$pid = ModelId::fromSerialized($input->getParameter('pid'));
if (!($dataProvider = $environment->getDataProvider($pid->getDataProviderName()))) {
return null;
}
if ($parent = $dataProvider->fetch($dataProvider->getEmptyConfig()->setId($pid->getId()))) {
return $parent;
}
return null;
}
/**
* Obtain the parameter with the given name from the input provider if it exists.
*
* @param InputProviderInterface $input The input provider.
* @param string $name The parameter to retrieve.
*
* @return ModelId|null
*/
private function modelIdFromParameter(InputProviderInterface $input, $name)
{
if ($input->hasParameter($name) && ($value = $input->getParameter($name))) {
return ModelId::fromSerialized($value);
}
return null;
}