controller.php

<?php

class GameController extends Controller
{
    public function showAction($id)
    {
        $game = $this
            ->get('doctrine')
            ->getRepository('Afsy\Bundle\BlackjackBundle\Entity\Game')
            ->find(Uuid::fromString($id))
        ;
        // I got : Warning: Illegal offset type in /Users/Tim/www/cqrs-afsy/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php line 2480
        
        $game = $this
            ->get('doctrine')
            ->getRepository('Afsy\Bundle\BlackjackBundle\Entity\Game')
            ->find((string) $id))
        ;
        // I got : ConversionException: Could not convert database value "6742563c-601f-11e3-a..." to Doctrine Type uuid
    }
}

entity.xml

<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
    <entity repository-class="Afsy\Bundle\BlackjackBundle\Entity\GameRepository" name="Afsy\Bundle\BlackjackBundle\Entity\Game" table="game">
        <id name="id" type="uuid" length="36" column="uuid" />

        <field name="playerCards" type="array" column="player_cards" />

        <field name="bankCards" type="array" column="bank_cards" />
    </entity>
</doctrine-mapping>