Admin shows thousands of cart items for customers

[xtremevision]

Preconditions (*)

1. Centos OS 7 x64
2. Magento 2.3.3
3. PHP 7.2

Steps to reproduce (*)

1. Create lots of carts / quotes, both as logged in user and guest
2. Keep one customer without any quotes
3. Goto backend, edit customer, click on Shopping Cart tab
4. Grid shows thousand of items

Expected result (*)

1. Shopping cart tab should show customer's cart items if available, or none if no carts available for customer

Actual result (*)

I am experiencing this issue in the backend admin, in the customer record, Shopping Cart tab. It looks like the getQuote() function returns all cart items (without a parent id), if no active quote is found for customer id [X].

See screenshot:

This getQuote() function is at fault from what I can tell.

The quoteRepository->getForCustomer() function throws the exception as shown here:

The trouble is if no quote is found, then _prepareCollection() will return all quote_items regardless of quote id, regardless of customer_id, as shown by this query:

SELECT main_table.* FROM quote_item AS main_table WHERE (parent_item_id IS NULL)

I fixed in by adding this check:

protected function _prepareCollection()
{
$quote = $this->getQuote();

    if ($quote) {
        $collection = $quote->getItemsCollection(false);
    } else {
        $collection = $this->_dataCollectionFactory->create();
    }

    $collection->addFieldToFilter('parent_item_id', ['null' => true]);

    /**** Added by me as temporary fix ***/
    if(is_null($quote->getId()))
        $collection->addFieldToFilter('quote_id', -1);
    /**** Added by me as temporary fix ***/

    $this->setCollection($collection);

    return parent::_prepareCollection();
}

It probably isn't the best or most elegant fix, but it works, or so it seems.
Does anyone have a better idea?

Thanks,
Michael Mussulis

[m2-assistant]

Hi @xtremevision. Thank you for your report.
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• Information on your environment
• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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@xtremevision do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

---

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[m2-assistant]

Hi @krishprakash. Thank you for working on this issue.
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[krishprakash]

@magento give me 2.4-develop instance

[magento-engcom-team]

Hi @krishprakash. Thank you for your request. I'm working on Magento 2.4-develop instance for you

[magento-engcom-team]

Hi @krishprakash, here is your Magento instance.
Admin access: https://i-27564-2-4-develop.instances.magento-community.engineering/admin_cbb5
Login: 043c35ee Password: f3e2f039d232
Instance will be terminated in up to 3 hours.

[krishprakash]

Hi @xtremevision. Thank you for your report.
Not able to Reproduce the issue on latest magento 2.3.4 instance
Kindly provide more information
Also please confirm the issue on latest 2.3.4 instance
Thanks !!

[xtremevision]

Hi @krishprakash,

Did you create lots of quotes? What does your quote table look like?

Thanks,
Michael.

[krishprakash]

Hi @xtremevision. Yes created many quotes for login and guest user as well
We can not see quote table for provided instance.
So if possible please share the video with steps you mentioned so will review in local instance
Thank You !!

[xtremevision]

Hi @krishprakash ,

I've got it figured out. The quote table was missing records for customers. This was causing the bad view in the admin, shopping cart tab.

I used a module called Login as Customer, to login as the customer, and this resulted in an empty quote record being created for that customer. Checking in the backend in the Shopping Cart tab now does not show any cart items for the customer.

It seems to me that Magento's logic is that each customer MUST have at least 1 empty cart in order for the Shopping Cart grid to function properly, and to avoid the "No such entity with customerId = XXX" exception.

I personally think this logic is somewhat flawed, and that even if there's no quote for a customer, the exception should be thrown and the cart should not show an items.

[krishprakash]

@xtremevision. Then this is the compatibility issue with your custom extension not the default magento issue