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app/code/Stemcell/Customer/Plugin/DataProviderWithDefaultAddressesPlugin.php

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+<?php
+
+namespace Stemcell\Customer\Plugin;
+
+use Magento\Customer\Model\Customer\DataProviderWithDefaultAddresses;
+use Magento\Framework\App\ObjectManager;
+use Psr\Log\LoggerInterface;
+use Stemcell\Customer\Model\ResourceModel\Salesperson;
+
+class DataProviderWithDefaultAddressesPlugin
+{
+    public function __construct(
+        protected Salesperson $salespersonResourceModel,
+    ){
+    }
+
+    public function getSalesPerson(int $customerId)
+    {
+        $connection = $this->salespersonResourceModel->getConnection();
+        $query = $connection->query('select salesperson_id from customer_salesperson where customer_id = '. $customerId);
+        $result = $query->fetchAll();
+        if (!empty($result)) {
+            return array_column($result, 'salesperson_id');
+        }
+        return [];
+    }
+
+    public function afterGetData(
+        DataProviderWithDefaultAddresses $subject,
+        array $result
+    ): array {
+
+        $logger = ObjectManager::getInstance()->get(LoggerInterface::class);
+
+        foreach ($result as $id => $entityData) {
+            if ($id) {
+
+                $result[$id]['customer']['extension_attributes']['customer_abbr'] = $entityData['customer']['customer_abbr'] ?? null;
+
+                $salesperson = $this->getSalesPerson($id);
+//                $logger->warning('$salesperson', $salesperson);
+                if ($salesperson) {
+                    $result[$id]['customer']['salespersons'] = $salesperson;
+                }
+            }
+        }
+
+        return $result;
+    }
+
+
+}