* refactored with entity service, so the code can be tested

src/App/Service/Article/ArticleService.php

@@ -0,0 +1,99 @@
+<?php
+
+namespace App\Service\Article;
+
+use App\Entity\Article;
+use App\Hydrator\DoctrineObject;
+use App\Service\EntityServiceInterface;
+use Doctrine\ORM\EntityManager;
+use Doctrine\ORM\Query;
+use Exception;
+
+class ArticleService implements EntityServiceInterface
+{
+
+    /**
+     * @var EntityManager
+     */
+    private $em;
+
+    /**
+     * @var DoctrineObject
+     */
+    private $hydrator;
+
+    public function __construct(EntityManager $em, DoctrineObject $hydrator)
+    {
+        $this->em       = $em;
+        $this->hydrator = $hydrator;
+    }
+
+    public function getList()
+    {
+        $qb       = $this->em->createQueryBuilder();
+        $entities = $qb->select('a,u,c')
+            ->from(Article::class, 'a')
+            ->leftJoin('a.author', 'u')
+            ->leftJoin('a.comments', 'c')
+            ->getQuery()
+            ->getArrayResult();
+        return $entities;
+    }
+
+    public function get($id)
+    {
+        $qb = $this->em->createQueryBuilder();
+
+        $entity = $qb->select('a,u,c')
+            ->from(Article::class, 'a')
+            ->leftJoin('a.author', 'u')
+            ->leftJoin('a.comments', 'c')
+            ->where('a.id = :aid')
+            ->setParameter('aid', $id)
+            ->getQuery()
+            ->getOneOrNullResult(Query::HYDRATE_ARRAY);
+
+        return $entity;
+    }
+
+    public function create($data)
+    {
+        $entity = $this->hydrator->hydrate($data, new Article());
+        try {
+            $this->em->persist($entity);
+            $this->em->flush();
+        } catch (Exception $ex) {
+            return false;
+        }
+        return $entity;
+    }
+
+    public function modify($id, $data)
+    {
+        if (null === ($entity = $this->em->find(Article::class, $id))) {
+            return false;
+        }
+
+        $entity = $this->hydrator->hydrate($data, $entity);
+        $this->em->persist($entity);
+        $this->em->flush();
+
+        return $entity;
+    }
+
+    public function delete($id)
+    {
+        if (null === ($entity = $this->em->find(Article::class, $id))) {
+            return false;
+        }
+
+        try {
+            $this->em->remove($entity);
+            $this->em->flush();
+        } catch (Exception $ex) {
+            return false;
+        }
+
+        return true;
+    }
+}