[symfony-devs] How get entity manager inside entity or twig extension

[hd_deman]

Hi,
Im trying to get entity manager inside entity or twig extension.
i want something like this in twig extension

<?php
//Twig/CoreExtension.php
    foreach($item->getChildren() as $i){
       print $i->getTitle();
    }
?>

<?php
//Entity/Section.php
    public function getChildren()
    {
        $EntityManager->children($this);
    }
?>

or like this

//Twig/CoreExtension.php
<?php
    foreach($EntityManager->children($item) as $i){
       print $i->getTitle();
    }
?>

but i cant get EntityManager.

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