/**
* Gets a reference to the entity identified by the given type and identifier
* without actually loading it.
*
* If partial objects are allowed, this method will return a partial object that only
* has its identifier populated. Otherwise a proxy is returned that automatically
* loads itself on first access.
*
* @return object The entity reference.
*/
public function getReference($entityName, $identifier)
{
$class = $this->_metadataFactory->getMetadataFor($entityName);
// Check identity map first, if its already in there just return it.
if ($entity = $this->_unitOfWork->tryGetById($identifier, $class->rootEntityName)) {
return $entity;
}
if (!is_array($identifier)) {
$identifier = array($class->identifier[0] => $identifier);
}
$entity = $this->_proxyFactory->getProxy($class->name, $identifier);
$this->_unitOfWork->registerManaged($entity, $identifier, array());
return $entity;
}
/**
* Gets a partial reference to the entity identified by the given type and identifier
* without actually loading it, if the entity is not yet loaded.
*
* The returned reference may be a partial object if the entity is not yet loaded/managed.
* If it is a partial object it will not initialize the rest of the entity state on access.
* Thus you can only ever safely access the identifier of an entity obtained through
* this method.
*
* The use-cases for partial references involve maintaining bidirectional associations
* without loading one side of the association or to update an entity without loading it.
* Note, however, that in the latter case the original (persistent) entity data will
* never be visible to the application (especially not event listeners) as it will
* never be loaded in the first place.
*
* @param string $entityName The name of the entity type.
* @param mixed $identifier The entity identifier.
* @return object The (partial) entity reference.
*/
public function getPartialReference($entityName, $identifier)
{
$class = $this->metadataFactory->getMetadataFor(ltrim($entityName, '\\'));
// Check identity map first, if its already in there just return it.
if ($entity = $this->unitOfWork->tryGetById($identifier, $class->rootEntityName)) {
return $entity instanceof $class->name ? $entity : null;
}
if (!is_array($identifier)) {
$identifier = array($class->identifier[0] => $identifier);
}
$entity = $class->newInstance();
$class->setIdentifierValues($entity, $identifier);
$this->unitOfWork->registerManaged($entity, $identifier, array());
return $entity;
}