createMediaSelectCustomField example

/** * @return array<string> */
    private function createContent(): array
    {
        $ids = $this->createMedia(9);

        $mediaIds = $ids->all();

        foreach (['product', 'category', 'order'] as $entity) {
            $this->createMediaCustomField($entity);
            $this->createMediaSelectCustomField($entity);
            $this->createMediaMultiSelectCustomField($entity);
        }

        $product = new ProductBuilder($ids, Uuid::randomHex(), 100);
        $product->price(100);
        $product->customField('custom_field_media_product', $ids->get('media-1'));
        $product->customField('custom_field_media_select_product', $ids->get('media-2'));
        $product->customField('custom_field_media_multi_select_product', [$ids->get('media-2'), $ids->get('media-3'), $ids->get('media-4')]);
        $products = [$product->build()];

        $this->getContainer()->get('product.repository')->create($products, Context::createDefaultContext());