/**
* {@inheritdoc}
*/
public function loadChoicesForValues(array $values, $value = null)
{
// Performance optimization
// Also prevents the generation of "WHERE id IN ()" queries through the
// object loader. At least with MySQL and on the development machine
// this was tested on, no exception was thrown for such invalid
// statements, consequently no test fails when this code is removed.
// https://github.com/symfony/symfony/pull/8981#issuecomment-24230557
if (empty($values)) {
return array();
}
// Optimize performance in case we have an object loader and
// a single-field identifier
$optimize = null === $value || is_array($value) && $this->idReader === $value[0];
if ($optimize && !$this->choiceList && $this->objectLoader && $this->idReader->isSingleId()) {
$unorderedObjects = $this->objectLoader->getEntitiesByIds($this->idReader->getIdField(), $values);
$objectsById = array();
$objects = array();
// Maintain order and indices from the given $values
// An alternative approach to the following loop is to add the
// "INDEX BY" clause to the Doctrine query in the loader,
// but I'm not sure whether that's doable in a generic fashion.
foreach ($unorderedObjects as $object) {
$objectsById[(string) $this->idReader->getIdValue($object)] = $object;
}
foreach ($values as $i => $id) {
if (isset($objectsById[$id])) {
$objects[$i] = $objectsById[$id];
}
}
return $objects;
}
return $this->loadChoiceList($value)->getChoicesForValues($values);
}
/**
* Returns the ID value for an object.
*
* This method assumes that the object has a single-column ID.
*
* @param object $object The object.
*
* @return mixed The ID value.
*/
public function getIdValue($object)
{
if (!$object) {
return;
}
if (!$this->om->contains($object)) {
throw new RuntimeException('Entities passed to the choice field must be managed. Maybe ' . 'persist them in the entity manager?');
}
$this->om->initializeObject($object);
$idValue = current($this->classMetadata->getIdentifierValues($object));
if ($this->associationIdReader) {
$idValue = $this->associationIdReader->getIdValue($idValue);
}
return $idValue;
}
/**
* {@inheritdoc}
*/
public function loadValuesForChoices(array $choices, $value = null)
{
// Performance optimization
if (empty($choices)) {
return array();
}
$values = array();
foreach ($choices as $i => $object) {
if (is_object($object)) {
try {
$values[$i] = (string) $this->idReader->getIdValue($object);
} catch (RuntimeException $e) {
if (!$this->isAllowAdd()) {
throw $e;
}
}
} elseif ($this->isAllowAdd()) {
$values[$i] = $object;
}
}
return $values;
}