Kdjykuj

I am creating Add to cart API and is working fine with logged-in customer but I have following query:

Query:- Suppose as a guest I have added product to cart and now I am login then how to convert guest quote to customer quote.

You need to create a new merge cart API for this.

webapi.xml

<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">

<route url="/V1/mergeGuestCart" method="POST">

    <service class="WebbyTroopsMergeGuestCartApiMergeGuestCartInterface" method="mergeCart"/>

    <resources>

        <resource ref="self" />

    </resources>

    <data>

        <parameter name="customerId" force="true">%customer_id%</parameter>

    </data> 

</route> 

</routes>

MergeCartInterface.php

namespace WebbyTroopsMergeGuestCartApi;



/**

 * Interface MergeGuestCartInterface

 * @package WebbyTroopsMergeGuestCartApi

 */

interface MergeGuestCartInterface

{



    /**

     * Merge guest cart to logged in customer cart

     *

     * @param string $guestQuoteId

     * @param int $customerId

     * @return bool

     */

    public function mergeCart($guestQuoteId, $customerId);

}

di.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="WebbyTroopsMergeGuestCartApiMergeGuestCartInterface" type="WebbyTroopsMergeGuestCartModelMergeGuestCart" />

</config>

MergeCart.php

namespace WebbyTroopsMergeGuestCartModel;



use MagentoQuoteModelQuoteIdMaskFactory;

use MagentoFrameworkExceptionCouldNotSaveException;

use MagentoQuoteApiCartRepositoryInterface;

use MagentoQuoteModelQuoteFactory;

use MagentoQuoteModelQuoteRepositorySaveHandler;

class MergeGuestCart implements WebbyTroopsMergeGuestCartApiMergeGuestCartInterface

{

 public function __construct(

    CartRepositoryInterface $quoteRepository,

    QuoteIdMaskFactory $quoteIdMaskFactory,

    QuoteFactory $quoteFactory,

    SaveHandler $saveHandler

) {

    $this->quoteRepository = $quoteRepository;

    $this->quoteIdMaskFactory = $quoteIdMaskFactory;

    $this->quoteFactory=$quoteFactory;

    $this->saveHandler = $saveHandler;

}



/**

 * {@inheritdoc}

 */

public function mergeCart($guestQuoteId, $customerId){

    $quoteIdMask = $this->quoteIdMaskFactory->create()->load($guestQuoteId, 'masked_id');

    $guestQuote= $this->quoteRepository->get($quoteIdMask->getQuoteId());

    $quote= $this->quoteFactory->create()->loadByCustomer($customerId);



    if($quote->merge($guestQuote)){

        try{

            $this->saveHandler->save($quote);

            $quote->collectTotals();

            return true;

        }catch(Exception $e){

            throw new CouldNotSaveException(__($e->getMessage()));

        }

    }else{

        return false;

    }

} 

}

Once you add product to guest cart you will get quote mask id otherwise you can get this from quote_id_mast. You can test this in any REST client like postman. Request payload will be like

{

  "guest_quote_id" : "z7sMMVNXpEFFOGXM9A6zt5RijsM39dKE"

}

with endpoint(POST) as

http://magento/rest/V1/mergeGuestCart

Make sure you are sending customer token in header. Let me know if need further help.