[Symfony][SF2][Symfony2]Form collections Opcje

[ixox]

Witam. Mam problem z obsłużeniem formularzy. Poniżej kod.
Otrzymuję błąd:

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Notice: Array to string conversion in /home/.../vendor/doctrine/dbal/lib/Doctrine/DBAL/Statement.php line 103
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Próbowałem również po kolei foreach-em "robić persist" ale otrzymuję błąd:

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The class 'Doctrine\Common\Collections\ArrayCollection' was not found in the chain configured namespaces FOS\UserBundle\Entity, SZ\UserBundle\Entity, SZ\SzBundle\Entity, FOS\UserBundle\Model
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Dzięki za odpowiedź.

Entity:

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**
 * @ORM\Entity
 * @ORM\Table(name="availability")
 */
class Availability
{
 
    public function __construct()
    {
        $this->availabilityFlexible = new \Doctrine\Common\Collections\ArrayCollection();
        $this->availabilitySession = new \Doctrine\Common\Collections\ArrayCollection();
    }
 
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;
 
    /**
     * @ORM\Column(name="description", type="string", length=255, nullable=true)
     */
    protected $description;
 
 
    /**
     * @ORM\OneToMany(targetEntity="AvailabilityFlexible", mappedBy="availability", cascade={"persist", "remove"})
     */
    protected $availabilityFlexible;
 
    /**
     * @ORM\OneToOne(targetEntity="AvailabilityFull", mappedBy="availability", cascade={"persist", "remove"})
     */
    protected $availabilityFull;
 
    /**
     * @ORM\OneToMany(targetEntity="AvailabilitySession", mappedBy="availability", cascade={"persist", "remove"})
     */
    protected $availabilitySession;
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    // AvailabilityFlexible.php
    /**
     * @ORM\ManyToOne(targetEntity="Availability", inversedBy="availabilityFlexible", cascade={"persist"})
     * @ORM\JoinColumn(name="availability_id", referencedColumnName="id")
     */
    protected $availability;
 
    // AvailabilityFull.php
    /**
     * @ORM\OneToOne(targetEntity="Availability", inversedBy="availabilityFull", cascade={"persist"})
     * @ORM\JoinColumn(name="availability_id", referencedColumnName="id")
     */
    protected $availability;
 
 
    // AvailabilitySession.php
    /**
     * @ORM\ManyToOne(targetEntity="Availability", inversedBy="availabilitySession", cascade={"persist"})
     * @ORM\JoinColumn(name="availability_id", referencedColumnName="id")
     */
    protected $availability;
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Form:

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    public function buildForm(FormBuilderInterface $builder, array $options)
    {
 
        $builder->add('description')
                ->add('AvailabilitySession', 'collection', array(
                    'type' => new AvailabilitySessionFormType(),
                    'allow_add' => true,
                    'prototype' => true,
                    'by_reference' => false,
                    'allow_delete' => true,
                ))
                ->add('AvailabilityFull', new AvailabilityFullFormType())
                ->add('AvailabilityFlexible', 'collection', array(
                    'type' => new AvailabilityFlexibleFormType(),
                    'allow_add' => true,
                    'by_reference' => false,
                    'allow_delete' => true,
        ));
    }
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Kontroler:

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    public function addAvailabilityAction(Request $request)
    {
        $availability = new Availability;
        $availability->getAvailabilityFlexible()->add(new AvailabilityFlexible);
        $availability->getAvailabilityFlexible()->add(new AvailabilityFlexible);
 
        $form = $this->createForm(new AvailabilityFormType(), $availability);
 
        if ($request->isMethod('POST')) {
            $form->bind($request);
            if ($form->isValid()) {
                $availability = $form->getData();
                $em = $this->getDoctrine()->getManager();
		$em->perist($availability);
                $em->flush();
            }
        }
    }
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[ixox]

Zmieniłem nazwy. Zrobiłem tak jak w dokumentacji, czyli w każdej metodzię addAvailabilitySession dodałem

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$availabilitySession->setAvailabilitySession($this); 
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itd.
Niestety nadal mam ten sam błąd.