Restricting customers to max of (some number) purchases for a certain product in Magento

Question

Is there any good modules out there that can handle this? Or would this be a custom event / observer that needs to be written?

Here's an image on a non magento site that shows specifically what i'm looking for.

Magento 2.2.3 EE

This needs to work with the Magento commerce b2b module. So everyone in a group/company would be limited. If there was 4 people in the group but one person purchased the max amount then the other 3 would not be allowed to purchase any. This makes it increasingly more complex and difficult logic.

Answer 1

You need write your custom module and you have to use this event (sales_quote_item_qty_set_after).

in this event you need to - check current logged user and get all items that the customer purchanesed during current month. - check the QTY of your product, and if the qty is excedded the maximum qty, you need to throw expection

throw new \Magento\Framework\Exception\CouldNotSaveException( __('The most you may purchase is %1.',$_qty));

you can also add message to the item itslef

$quoteItem->getQuote()->addErrorInfo(
        'stock',
        'cataloginventory',
        \Magento\CatalogInventory\Helper\Data::ERROR_QTY,
        __('Please correct the quantity for some products.')
        );

where the $quoteItem coming from this code

$quoteItem = $observer->getEvent()->getItem();

I had before a similarlogic and this work for me