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Derived Collections
===================
You can create custom collection classes by extending the
``Doctrine\Common\Collections\ArrayCollection`` class. If the
``__construct`` semantics are different from the default ``ArrayCollection``
you can override the ``createFrom`` method:
.. code-block:: php
final class DerivedArrayCollection extends ArrayCollection
{
/** @var \stdClass */
private $foo;
public function __construct(\stdClass $foo, array $elements = [])
{
$this->foo = $foo;
parent::__construct($elements);
}
protected function createFrom(array $elements) : self
{
return new static($this->foo, $elements);
}
}
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