Implemented a stub DeviceRepository to prevent exception when try to delete a device.

Now the devices can not be deleted (but no exception), to prevent users to accidentally delete still useful devices from old Part-DB versions (as currently it is not possible to view which infos a device contains). This fixes issue #60.

src/Entity/Devices/Device.php

@@ -60,7 +60,7 @@ use InvalidArgumentException;
 /**
  * Class AttachmentType.
  *
- * @ORM\Entity(repositoryClass="App\Repository\StructuralDBElementRepository")
+ * @ORM\Entity(repositoryClass="App\Repository\Parts\DeviceRepository")
  * @ORM\Table(name="`devices`")
  */
 class Device extends AbstractPartsContainingDBElement

src/Repository/Parts/DeviceRepository.php

@@ -0,0 +1,37 @@
+<?php
+
+
+namespace App\Repository\Parts;
+
+
+use App\Entity\Base\AbstractPartsContainingDBElement;
+use App\Entity\Devices\Device;
+use App\Entity\Parts\Category;
+use App\Entity\Parts\Part;
+use App\Repository\AbstractPartsContainingRepository;
+
+class DeviceRepository extends AbstractPartsContainingRepository
+{
+
+    public function getParts(object $element, array $order_by = ['name' => 'ASC']): array
+    {
+        if (!$element instanceof Device) {
+            throw new \InvalidArgumentException('$element must be an Device!');
+        }
+
+
+        //TODO: Change this later, when properly implemented devices
+        return [];
+    }
+
+    public function getPartsCount(object $element): int
+    {
+        if (!$element instanceof Device) {
+            throw new \InvalidArgumentException('$element must be an Device!');
+        }
+
+        //TODO: Change this later, when properly implemented devices
+        //Prevent user from deleting devices, to not accidentally remove filled devices from old versions
+        return 1;
+    }
+}