Adding a product with "Multi Select" option to cart doesn't work

[TalkMarc]

When adding an item to a cart that has a mandatory option of type "Multi Select" in it's assigned option group, the following exception is thrown:

Error:
Call to a member function getOptionValue() on array

  at /srv/sylius/src/Traits/OrderItemCustomerOptionCapableTrait.php:113
  at Tests\Brille24\SyliusCustomerOptionsPlugin\Application\src\Entity\Order\OrderItem->equals(object(OrderItem))
     (/srv/sylius/vendor/sylius/sylius/src/Sylius/Bundle/OrderBundle/Controller/OrderItemController.php:258)
  at Sylius\Bundle\OrderBundle\Controller\OrderItemController->Sylius\Bundle\OrderBundle\Controller\{closure}(object(OrderItem), 2)
  at array_filter(array(object(OrderItem), object(OrderItem), object(OrderItem)), object(Closure), 1)
     (/srv/sylius/vendor/doctrine/collections/lib/Doctrine/Common/Collections/ArrayCollection.php:371)
  at Doctrine\Common\Collections\ArrayCollection->filter(object(Closure))
     (/srv/sylius/vendor/doctrine/collections/lib/Doctrine/Common/Collections/AbstractLazyCollection.php:230)
  at Doctrine\Common\Collections\AbstractLazyCollection->filter(object(Closure))
     (/srv/sylius/vendor/sylius/sylius/src/Sylius/Bundle/OrderBundle/Controller/OrderItemController.php:258)
  at Sylius\Bundle\OrderBundle\Controller\OrderItemController->resolveAddedOrderItem(object(Order), object(OrderItem))
     (/srv/sylius/vendor/sylius/sylius/src/Sylius/Bundle/OrderBundle/Controller/OrderItemController.php:90)
  at Sylius\Bundle\OrderBundle\Controller\OrderItemController->addAction(object(Request))
     (/srv/sylius/vendor/symfony/http-kernel/HttpKernel.php:163)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     (/srv/sylius/vendor/symfony/http-kernel/HttpKernel.php:75)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     (/srv/sylius/vendor/symfony/http-kernel/Kernel.php:202)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     (public/index.php:27) 

The OrderItemCustomerOptionCapableTrait.php doesn't seem to expect a single option to have an array of OrderItemOptions instead of just a OrderItemOption as is the case in the other option types:

I encountered this while working on #146

[mamazu]

Thanks for reporting this, I see that multi select options haven't been handled there. I have created a pull request that should fix the issue. Can you check if it resolves you issue?