问题

I have a Symfony OrderType form attached to an Order object. This Order object has an items property which contains an ArrayCollection of OrderItem objects. These OrderItem objects each contain product and quantity properties. The product property is linked to a Product object. Each OrderItem is associated to an OrderItemType which is part of the CollectionType associated to the Order items property.

To make a long story short, here is the code (very simplified, with minimal properties and no doctrine annotations):

Please note that everything basically works, I'm not looking for an error in this code :)

Order class

class Order {
    private $id;
    private $items;// ArrayCollection of OrderItem
}

Order item class

class OrderItem {
    private $id;
    private $product;// Product object
    private $quantity;// int
}

Order form

class OrderType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('items', CollectionType::class, array(
                'by_reference' => false,
                'entry_type'   => OrderItemType::class,
                'allow_add' => true,
                'allow_delete' => true
            ));
    }
}

Order item form

class OrderItemType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('product', EntityType::class, array(
                'class' => 'AppBundle\Entity\Product',
                'choice_label' => 'id'
            ))
            ->add('quantity', NumberType::class)
    }
}

Of course, the user can add and delete lines in an order which creates, edits and removes lines appropriately. Well almost...

If I remove the last line of the order and create a new line, Symfony thinks that the new line is actually a modification of the old one. Of course, there is no way for Symfony to know that this line is not the old one.

So I added an id field to my OrderItemType. But of course, Symfony cannot set the id on submit because there is no setId method in OrderItem (and that's normal because setting the id of an object manually is a bad idea).

Well that's where I'm stuck. I guess I could set the id field as mapped: false and implement custom logic on the controller to get rid of the old item that was deleted when its id does not appear in the posted values and create a new OrderItem for the item that has an empty id, but this seems like ugly hacking to me and I wonder if I'm not completely missing something as this looks like a very basic problem.

So does Symfony have a built-in way to recognize the difference between deletion+creation and edition in a CollectionType form? Am I completely missing something? Is the cake a lie?

Edit

I know that my code is not complete, but I want to focus on the problem at hand. To put in another way:

The user creates two lines in the order for a client that wants 3 productA and 2 productB.
The user saves the order (Symfony creates 2 OrderItem objects with ID 1 and 2 in the database)
The client calls again and wants 5 productC instead of the 2 productB.
The user deletes line 2 (2 productB) and adds a new line (5 productC).

Here, Symfony changes the OrderItem with ID #2 by assigning the new product (productC) and quantity (5). But I would like Symfony to delete OrderItem #2 and create a new OrderItem with ID 3.

I hope that's a little bit more clear.

回答1:

I know you haven't added your Doctrine annotations yet, but it's related to the Id problem you are describing. Normally you auto generate an ID, so there is no 'setter', but there is a 'getter'.

So you would have something like this:

class OrderItem {
...
    /**
     * @ORM\Id
     * @ORM\Column(name="order_item_id", type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $order_item_id;

Yes, your $quantity value should be an 'int', but it doesn't really matter. I'm just making you aware that you can't have half a quantity.

来源：https://stackoverflow.com/questions/38333413/symfony-collectiontype-regards-deletioncreation-as-a-modification-of-an-item

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