/**
* @param string $value
* @param Doctrine\Common\Collections\Collection $collection
*/
public function reverseTransform($value, $collection)
{
if (strlen(trim($value)) == 0) {
// don't check for collection count, a straight clear doesnt initialize the collection
$collection->clear();
return $collection;
}
$className = $this->getOption('className');
$values = explode($this->getOption('separator'), $value);
if ($this->getOption('trim') === true) {
$values = array_map('trim', $values);
}
/* @var $em Doctrine\ORM\EntityManager */
$em = $this->getOption('em');
$reflField = $em->getClassMetadata($className)->getReflectionProperty($this->getOption('fieldName'));
// 1. removing elements that are not yet present anymore
foreach ($collection as $object) {
$uniqueIdent = $reflField->getValue($object);
$key = \array_search($uniqueIdent, $values);
if ($key === false) {
$collection->removeElement($object);
} else {
// found in the collection, no need to do anything with it so remove it
unset($values[$key]);
}
}
// 2. add elements that are known to the EntityManager but newly connected, query them from the repository
if (count($values)) {
$dql = "SELECT o FROM " . $className . " o WHERE o." . $this->getOption('fieldName') . " IN (";
$query = $em->createQuery();
$needles = array();
$i = 0;
foreach ($values as $val) {
$query->setParameter(++$i, $val);
$needles[] = "?" . $i;
}
$dql .= implode(",", $needles) . ")";
$query->setDql($dql);
$newElements = $query->getResult();
foreach ($newElements as $object) {
$collection->add($object);
$uniqueIdent = $reflField->getValue($object);
$key = \array_search($uniqueIdent, $values);
unset($values[$key]);
}
}
// 3. new elements that are not in the repository have to be created and persisted then attached:
if (count($values)) {
$callback = $this->getOption('createInstanceCallback');
if (!$callback || !\is_callable($callback)) {
throw new TransformationFailedException("Cannot transform list of identifiers, because a new " . "element was detected and it is unknown how to create an instance of this element.");
}
foreach ($values as $newValue) {
$newInstance = \call_user_func($callback, $newValue);
if (!$newInstance instanceof $className) {
throw new TransformationFailedException("Error while trying to create a new instance for " . "the identifier '" . $newValue . "'. No new instance was created.");
}
$collection->add($newInstance);
$em->persist($newInstance);
}
}
return $collection;
}
