ResourceWrapper.php

<?php

namespace Infinite\BookingBundle\Form\Model;

use Infinite\BookingBundle\Entity\Resource;

class ResourceWrapper
{
    protected $resource;
    public $baseAvailability = array();
    public $additionalAvailability = array();

    public function __construct(Resource $resource, array $baseAvailability = array(), array $additionalAvailability = array())
    {
        $this->resource = $resource;
        $this->baseAvailability = $baseAvailability;
        $this->additionalAvailability = $additionalAvailability;
    }

    public function unwrap()
    {
        $availabilities = $this->resource->getAvailabilities();

        foreach (array_merge($this->baseAvailability, $this->additionalAvailability) as $availability) {
            if (!$availabilities->contains($availabilities)) {
                $availabilities->add($availability);
            }
        }

        return $this->resource;
    }
}