symfony - Symfony2 Swap 2 objects primary key Doctrine -

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i've got myself entity

/**  * @var integer  *  * @orm\column(name="id", type="integer")  * @orm\id  * @orm\generatedvalue(strategy="auto")  */ private $id;  /**  * @var integer  *  * @orm\column(name="position", type="integer")  * @orm\generatedvalue(strategy="identity")  */ private $position;

the id primary key i'll sort array position. want make functions swap 2 of items when sorting or move them , down.

how can make constructor increment each new object create automatically?

i've tried:

 /**  * constructor  */ public function __construct() {     $this->position = $this->id+1; }

but id assigned after persisting object each 1 has position set 1. need use life cycle callbacks?

lifecycle callbacks work want have aware if modify entity after flushing database you're gonna have flush again save new information.


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