private function checkDuplicity(Product $product)
{
foreach ($product->getCategories() as $category) {
foreach ($category->getProducts() as $duplicateCandidate) {
$path = $product->getPath($category);
if ($duplicateCandidate !== $product && $duplicateCandidate->getPath($category) === $path) {
throw new EntityDuplicateException(sprintf('Product with path %s already exists.', $path));
}
}
}
}
