[Question] Simplest way to promote items in a Translations object to a subclass?

[rulatir]

Use case: I receive a Translations object $original containing vanilla Translation items, and I must return a Translations object $extended with the following properties:

• all "global" properties and metadata (even custom ones!) not pertaining to individual Translation items must be the same as in the $original
• every Translation item must be replaced by an instance of ExtendedTranslation holding the same information (as well as some extra information specific to ExtendedTranslation).

This was easy while ->exchangeArray() was available. Now that it is gone, it seems I must do this:

• $extended = clone $original;
• getTranslations()
• iterate to remove them from $extended (O(n^2)?)
• iterate again to promote Translation items to ExtendedTranslation objects and add() them to $extended

Is there a simpler way with current API?

Translations is a collection object, and I believe it should provide fully featured collection API: map(), filter(), removeAll() etc.

[oscarotero]

Probably something like this?

$extended = clone $original;

foreach ($extended as $translation) {
    $extended->add(new ExtendedTranslation($translation));
}

If the old and new translations has the same id, it will be overrided, so you don't need to remove the first.

Another way is creating the ExtendedTranslations class:

class ExtendedTranslations extends Translations {
    public static function create(Translations $traslations) {
        $new = new static();
        $new->description = $translations->description;
        $new->headers = $translations->headers;
        $new->flags = $translations->flags;
        $new->translations = array_map(function ($translation) {
            return new ExtendedTranslation($translation))
        }, $translations->getTranslations());

        return $new;
    }
}

$extended = ExtendedTranslations::create($original);