/**
* {@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);
}
public function __construct(ObjectManager $om, ClassMetadata $classMetadata)
{
$ids = $classMetadata->getIdentifierFieldNames();
$idType = $classMetadata->getTypeOfField(current($ids));
$this->om = $om;
$this->classMetadata = $classMetadata;
$this->singleId = 1 === count($ids);
$this->intId = $this->singleId && in_array($idType, array('integer', 'smallint', 'bigint'));
$this->idField = current($ids);
// single field association are resolved, since the schema column could be an int
if ($this->singleId && $classMetadata->hasAssociation($this->idField)) {
$this->associationIdReader = new self($om, $om->getClassMetadata($classMetadata->getAssociationTargetClass($this->idField)));
$this->singleId = $this->associationIdReader->isSingleId();
$this->intId = $this->associationIdReader->isIntId();
}
}
