问题:

I am switching to Ramsey\Uuid and don't know what is the intended way to generate the Uuids.

Either as shown in the examples with an anntoation:

/**  * @var UuidInterface  *  * @ORM\Id  * @ORM\Column(type="uuid", unique=true)  * @ORM\GeneratedValue(strategy="CUSTOM")  * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator")  */ private $id;   public function __construct() { }

Or manually in the constructor:

/**  * @var UuidInterface  *  * @ORM\Id  * @ORM\Column(type="uuid", unique=true)  */ private $id;   public function __construct() {     $this->id = Uuid::uuid4(); }

In the second case, I do not understand how an existing id would be set during hydration. I added a public setter for testing purposes, but it is not called! In my understanding, when loading from db, a new object is created, which executes the constructor and hence sets a new uuid. Then somehow, this uuid must be replaced by the one from the db record. Am I missing something?

However the big advantage that the id is available immediately is gone when using the annotation, since the generation only takes place when calling $em->persist(...).

There are also variants out there where the constructor takes an optional uuid argument and uses it if not null.

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