getMainCategories example

$salesChannelId = Uuid::randomHex();
        $salesChannelContext = $this->createStorefrontSalesChannelContext($salesChannelId, 'test');

        $id = $this->createTestProduct();

        $criteria = new Criteria([$id]);
        $criteria->addAssociation('mainCategories');

        /** @var ProductEntity $product */
        $product = $this->productRepository->search($criteria, $salesChannelContext->getContext())->first();

        static::assertNotNull($product->getMainCategories());
        static::assertInstanceOf(MainCategoryCollection::class, $product->getMainCategories());
        static::assertEmpty($product->getMainCategories());

        // update main category         $categories = $this->categoryRepository->searchIds(new Criteria(), Context::createDefaultContext());

        $this->productRepository->update([
            [
                'id' => $id,
                'mainCategories' => [
                    [
                        

        return new OrFilter(array_map(static fn (string $id) => new ContainsFilter('path', '|' . $id . '|'), $ids));
    }

    private function getMainCategory(ProductEntity $product, SalesChannelContext $context): ?CategoryEntity
    {
        $criteria = new Criteria();
        $criteria->setLimit(1);
        $criteria->setTitle('breadcrumb-builder::main-category');

        if (($product->getMainCategories() === null || $product->getMainCategories()->count() <= 0) && $product->getParentId() !== null) {
            $criteria->addFilter($this->getMainCategoryFilter($product->getParentId(), $context));
        } else {
            $criteria->addFilter($this->getMainCategoryFilter($product->getId(), $context));
        }

        $categories = $this->categoryRepository->search($criteria, $context->getContext())->getEntities();
        if ($categories->count() <= 0) {
            return null;
        }

        $firstCategory = $categories->first();