Mrthdrb

I want to add custom attribute to http://magento2/rest/V1/carts/mine/totals API response.

I have done follwing way but it not working.

extension_attributes.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
 <extension_attributes for="MagentoQuoteApiDataCartItemInterface">
 <attribute code="product_option" type="float" />
 </extension_attributes>
</config>

di.xml

<type name="MagentoQuoteModelQuoteItem">
 <plugin name="cs_product_opt" type="NamespaceProductPluginModelCartCartTotalRepositoryPlugin" />
</type>

Plugin file 

<?php
/**
* Copyright 2016 aheadWorks. All rights reserved.
* See LICENSE.txt for license details.
*/

namespace NamespaceProductPluginModelCart;

use MagentoQuoteApiDataTotalsExtensionInterface;
use MagentoQuoteApiDataTotalsExtensionFactory;
use MagentoQuoteApiDataCartItemExtensionFactory;
use MagentoQuoteApiDataTotalsInterface;
use MagentoQuoteApiCartRepositoryInterface;
use MagentoQuoteModelCartCartTotalRepository as TotalRepository;
use MagentoQuoteModelQuote;

/**
 * Class AheadworksStoreCreditPluginModelCartCartTotalRepositoryPlugin
 */
class CartTotalRepositoryPlugin

 /**
 * @var CartRepositoryInterface
 */
 private $quoteRepository;

 /**
 * @var CartItemExtensionFactory
 */
 private $totalsExtensionFactory;

 /**
 * @param CartRepositoryInterface $quoteRepository
 * @param CartItemExtensionFactory $totalsExtensionFactory
 */
 public function __construct(
 CartRepositoryInterface $quoteRepository,
 CartItemExtensionFactory $totalsExtensionFactory
 ) 
 $this->quoteRepository = $quoteRepository;
 $this->totalsExtensionFactory = $totalsExtensionFactory;
 

 /**
 * Apply extension attributes to totals
 *
 * @param TotalRepository $subject
 * @param Closure $proceed
 * @param int $cartId
 * @return TotalsInterface
 * @SuppressWarnings(PHPMD.UnusedFormalParameter)
 */
 public function aroundGet(TotalRepository $subject, Closure $proceed, $cartId)
 
 /** @var TotalsInterface $totals */
 $totals = $proceed($cartId);

 /** @var MagentoQuoteApiDataTotalsExtensionInterface $extensionAttributes */
 $extensionAttributes = $totals->getExtensionAttributes()
 ? $totals->getExtensionAttributes()
 : $this->totalsExtensionFactory->create();

 /** @var Quote $quote */
 $quote = $this->quoteRepository->getActive($cartId);

 $extensionAttributes->setProductOption(1.11);
 $totals->setExtensionAttributes($extensionAttributes);
 return $totals;
 

anyone have idea how to add custom attribute to Quote Item Rest API.

To add new attribute on cart item. you need to consume V1/carts/mine service.

CartRepositoryPlugin.php

<?php
/**
* Copyright 2016 aheadWorks. All rights reserved.
* See LICENSE.txt for license details.
*/

namespace NamespaceProductPluginModelCart;

use MagentoQuoteApi;
use MagentoQuoteApiCartRepositoryInterface;
use MagentoQuoteApiCartTotalRepositoryInterface;
use MagentoCatalogHelperProductConfigurationPool;
use MagentoFrameworkApiDataObjectHelper;
use MagentoFrameworkApiExtensibleDataInterface;
use MagentoQuoteModelCartTotalsItemConverter;
use MagentoQuoteApiCouponManagementInterface;
use MagentoQuoteModelCartTotalsConverter;
use MagentoQuoteApiDataCartItemExtensionFactory;
use MagentoQuoteModelCartCartTotalRepository as TotalRepository;

/**
 * Class AheadworksStoreCreditPluginModelCartCartTotalRepositoryPlugin
 */
class CartRepositoryPlugin

/**
 * Cart totals factory.
 *
 * @var ApiDataTotalsInterfaceFactory
 */
private $totalsFactory;

/**
 * Quote repository.
 *
 * @var MagentoQuoteApiCartRepositoryInterface
 */
private $quoteRepository;

/**
 * @var MagentoFrameworkApiDataObjectHelper
 */
private $dataObjectHelper;

/**
 * @var ConfigurationPool
 */
private $itemConverter;

/**
 * @var CouponManagementInterface
 */
protected $couponService;

/**
 * @var TotalsConverter
 */
protected $totalsConverter;

/**
 * @param ApiDataTotalsInterfaceFactory $totalsFactory
 * @param CartRepositoryInterface $quoteRepository
 * @param DataObjectHelper $dataObjectHelper
 * @param CouponManagementInterface $couponService
 * @param TotalsConverter $totalsConverter
 * @param ItemConverter $converter
 */
public function __construct(
 ApiDataTotalsInterfaceFactory $totalsFactory,
 CartRepositoryInterface $quoteRepository,
 DataObjectHelper $dataObjectHelper,
 CouponManagementInterface $couponService,
 TotalsConverter $totalsConverter,
 CartItemExtensionFactory $cartItemInterfaceFactory,
 ItemConverter $converter
) 
 $this->totalsFactory = $totalsFactory;
 $this->quoteRepository = $quoteRepository;
 $this->dataObjectHelper = $dataObjectHelper;
 $this->couponService = $couponService;
 $this->totalsConverter = $totalsConverter;
 $this->cartItemInterfaceFactory = $cartItemInterfaceFactory;
 $this->itemConverter = $converter;


/**
 * Apply extension attributes to totals
 *
 * @param TotalRepository $subject
 * @param Closure $proceed
 * @param int $cartId
 * @return TotalsInterface
 * @SuppressWarnings(PHPMD.UnusedFormalParameter)
 */

public function aroundGet(TotalRepository $subject, Closure $proceed, $cartId)

 /** @var MagentoQuoteModelQuote $quote */
 $quote = $this->quoteRepository->getActive($cartId);
 if ($quote->isVirtual()) 
 $addressTotalsData = $quote->getBillingAddress()->getData();
 $addressTotals = $quote->getBillingAddress()->getTotals();
 else 
 $addressTotalsData = $quote->getShippingAddress()->getData();
 $addressTotals = $quote->getShippingAddress()->getTotals();
 
 unset($addressTotalsData[ExtensibleDataInterface::EXTENSION_ATTRIBUTES_KEY]);

 /** @var MagentoQuoteApiDataTotalsInterface $quoteTotals */
 $quoteTotals = $this->totalsFactory->create();
 $this->dataObjectHelper->populateWithArray(
 $quoteTotals,
 $addressTotalsData,
 MagentoQuoteApiDataTotalsInterface::class
 );
 $items = [];
 foreach ($quote->getAllVisibleItems() as $index => $item) 
 $cartItemExtensionAttributes = $item->getExtensionAttributes();
 if($cartItemExtensionAttributes == null)
 $cartItemExtensionAttributes = $this->cartItemInterfaceFactory->create();
 $cartItemExtensionAttributes->setProductOption('Product Option Check');
 $item->setExtensionAttributes($cartItemExtensionAttributes); 
 $item->save();
 
 $items[$index] = $this->itemConverter->modelToDataObject($item);
 

 $calculatedTotals = $this->totalsConverter->process($addressTotals);
 $quoteTotals->setTotalSegments($calculatedTotals);
 $amount = $quoteTotals->getGrandTotal() - $quoteTotals->getTaxAmount();
 $amount = $amount > 0 ? $amount : 0;
 $quoteTotals->setCouponCode($this->couponService->get($cartId));
 $quoteTotals->setGrandTotal($amount);
 $quoteTotals->setItems($items);
 $quoteTotals->setItemsQty($quote->getItemsQty());
 $quoteTotals->setBaseCurrencyCode($quote->getBaseCurrencyCode());
 $quoteTotals->setQuoteCurrencyCode($quote->getQuoteCurrencyCode());
 return $quoteTotals;
 

extension_attributes.xml

 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
<extension_attributes for="MagentoQuoteApiDataCartItemInterface">
 <attribute code="product_option" type="string" />
</extension_attributes>

di.xml

 <type name="MagentoQuoteModelCartCartTotalRepository">
 <plugin name="cp_product_opt" type="CommercepunditProductPluginModelCartCartRepositoryPlugin" />
</type>

I hope it'll work for you. Let me know if you need further help.