Mapping instantiated/memoized object

[nlemoine]

Hello!

I have a specific situation where I want to map properties of an already existing/memoized object.

Here's some code to make it more clear.

use CuyZ\Valinor\MapperBuilder;

$mapper = (new MapperBuilder())
    ->allowPermissiveTypes()
    ->allowSuperfluousKeys()
    ->enableFlexibleCasting()
    ->registerConstructor(AbstractThing::get(...))
    ->mapper();

abstract class AbstractThing {
    private static array $caches = [];

    final public function __construct(
        protected readonly int $id
    ) {
    }

    public static function get(int $id): static {
        return self::$caches[static::class . $id] ??= new static($id);
    }
}

class Entity extends AbstractThing {
    protected string $name;
    protected string $description;
}

$entity = Entity::get(1);
$object = $mapper->map(
    Entity::class,
    [
        'name' => 'John Doe',
        'description' => 'This is a description',
    ],
);

I want to map protected properties of the child class, not the ones from the constructor and I get find my way around it, not matter how I try to build my object, it's either building new instances (if I remove the constructor and build the object another way) or returns the memoized instance (but does not map extra protected props).

It's obviously the way Valinor works but I just wonder if someone had a solution to trick this.

[romm]

Hi @nlemoine, the mapper cannot map properties on existing objects, and probably never will be able to. One of the rules that this library wants to maintain is to have objects in a valid state as soon as they are created. The example you gave goes against this rule.

Hope you'll find a way to solve your issue. 😊

[nlemoine]

Thank you for the quick reply! :)