Symfony ArrayCollection vs PersistentCollection
Short answer:
/** * @param Doctrine\Common\Collections\Collection $users * @return $this */public function setChildren(Doctrine\Common\Collections\Collection $users){ $this->children = $users; return $this;}Explanation:
If you look deep into Doctrine Classes you will see the following structure:
Array collection is class that implements interface Collection:
class ArrayCollection implements Collection, SelectablePersistentCollection is class that extentds AbstractLazyCollection:
final class PersistentCollection extends AbstractLazyCollection implements Selectablebut AbstractLazyCollection implements Collection:
abstract class AbstractLazyCollection implements CollectionSo:
Collection is interface, that you should use in method setChildren().
This is because of doctrine use lazy loading - mechanism that allow to load not all properties, but only these, that are needed.
Similar question:
Doctrine manyToMany return PersistentCollection instead of ArrayCollection