feat: add plugin for guest compatibility

Author: Francois-Gomis

Plugin/CartPlugin.php

@@ -0,0 +1,61 @@
+<?php
+namespace Alma\GraphQL\Plugin;
+
+use Alma\MonthlyPayments\Helpers\Logger;
+use Magento\Framework\GraphQl\Config\Element\Field;
+use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
+use Magento\QuoteGraphQl\Model\Resolver\Cart;
+use Alma\GraphQL\Helpers\QuoteHelper;
+use \Magento\Framework\GraphQl\Query\ResolverInterface;
+
+class CartPlugin
+{
+    /**
+     * @var Logger
+     */
+    private $logger;
+    /**
+     * @var QuoteHelper
+     */
+    private $quoteHelper;
+
+    /**
+     * @param Logger $logger
+     * @param QuoteHelper $quoteHelper
+     */
+    public function __construct(
+        Logger $logger,
+        QuoteHelper $quoteHelper
+    )
+    {
+        $this->logger = $logger;
+        $this->quoteHelper = $quoteHelper;
+
+    }
+
+    /**
+     * @param Cart $cart
+     * @param $result
+     * @param Field $field
+     * @param $context
+     * @param ResolveInfo $info
+     * @param array|null $value
+     * @param array|null $args
+     * @return mixed
+     */
+    public function afterResolve(
+        ResolverInterface $cart,
+        $result,
+        Field $field,
+              $context,
+        ResolveInfo $info,
+        array $value = null,
+        array $args = null
+    )
+    {
+        $cart = $result['model'];
+        $cartId = (int) $cart->getId();
+        $this->quoteHelper->setEligibilityQuoteId($cartId);
+        return $result;
+    }
+}

etc/graphql/di.xml

@@ -1,4 +1,7 @@
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+    <type name="Magento\QuoteGraphQl\Model\Resolver\Cart">
+        <plugin name="addQuotePlugin" type="Alma\GraphQL\Plugin\CartPlugin"/>
+    </type>
     <type name="Magento\QuoteGraphQl\Model\Cart\Payment\AdditionalDataProviderPool">
         <arguments>
             <argument name="dataProviders" xsi:type="array">