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I am creating a frontend from for Sellers to add/edit their product on website, product adding/editing is working perfect. Now I have to assign that product to a category

Almost on every article and blog there is one proper solution to assign product to a category:

//Removing previous categories $previousCategoryIds = $product->getCategoryIds(); foreach($previousCategoryIds as $k=>$previousCategoryId){ $this->categoryLinkRepository->deleteByIds($previousCategoryId,$product->getSku()); } //Assigning new categories $this->categoryLinkManagement->assignProductToCategories($product->getSku(),$categories);

The code is fine, but I am getting this error:

Fatal error: Uncaught Error: Call to undefined method Magento\Catalog\Model\ResourceModel\Category\Flat::saveAttribute() in ...vendor/magento/module-catalog-url-rewrite/Observer/CategoryUrlPathAutogeneratorObserver.php:96

I have searched this error and found the cause of this error:
https://github.com/magento/magento2/issues/9725#issuecomment-346621159

The problem is, category link repository and link management is only for backend, and I am trying to use it on frontend scope that's why it is causing this error.

I have also tried this:

$product->setCategoryIds($categories);

But above code appending categories, not replacing previous categories.

Can you help me resolve this issue? I have tried everything I have found.

Edit:

The problem is with flat category, if I enable flat category then error occurs, and if I disable flat category it is working fine.

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  • which magento version you used? any other category related extension are there? Commented Oct 16, 2019 at 6:00
  • no other category extension. And I am using magento 2.2.8. Please see tags that I have attached Commented Oct 16, 2019 at 6:07

1 Answer 1

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can you try this code it's works for me

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); $CategoryLinkRepository = $objectManager->get('\Magento\Catalog\Model\CategoryLinkRepository'); $categoryId = 4; $sku = 'Jacket'; $CategoryLinkRepository->deleteByIds($categoryId,$sku); $categoryIds = [3]; // your category ids Array like [2,3,5] $product = $objectManager->get('Magento\Catalog\Model\Product')->loadByAttribute('sku', $sku); $product->setCategoryIds($categoryIds); $product->save();
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  • I have tried same thing, but getting error on this: $CategoryLinkRepository->deleteByIds($categoryId,$sku); please check question Commented Oct 16, 2019 at 5:53
  • i have tested code in magento 2.2.8 but i'm not getting any errors. Commented Oct 16, 2019 at 6:35
  • Have you tried this on frontend or backend? is that you custom script or you are doing it in controller? Commented Oct 16, 2019 at 6:36
  • on frontend using custom root script for testing Commented Oct 16, 2019 at 6:41
  • that's it mate :). In custom script you can define scope of file like adminhtml or cronjob etc. But in frontend controller it would cause issue, this is what I am facing :( Commented Oct 16, 2019 at 6:52

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