EZP-31808: Added conversion from string to int in RelationListValueTransformer::reverseTransform

src/lib/FieldType/DataTransformer/RelationListValueTransformer.php

@@ -37,6 +37,7 @@ public function reverseTransform($value)
 
         $destinationContentIds = explode(',', $value);
         $destinationContentIds = array_map('trim', $destinationContentIds);
+        $destinationContentIds = array_map('intval', $destinationContentIds);
 
         return new Value($destinationContentIds);
     }

src/lib/Tests/FieldType/DataTransformer/RelationListValueTransformerTest.php

@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * @copyright Copyright (C) eZ Systems AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace EzSystems\EzPlatformContentForms\Tests\FieldType\DataTransformer;
+
+use eZ\Publish\Core\FieldType\RelationList\Value;
+use EzSystems\EzPlatformContentForms\FieldType\DataTransformer\RelationListValueTransformer;
+use PHPUnit\Framework\TestCase;
+
+final class RelationListValueTransformerTest extends TestCase
+{
+    /**
+     * @dataProvider dataProviderForTestReverseTransform
+     */
+    public function testReverseTransform($value, ?Value $expectedValue): void
+    {
+        $transformer = new RelationListValueTransformer();
+
+        $this->assertEquals(
+            $expectedValue,
+            $transformer->reverseTransform($value)
+        );
+    }
+
+    public function dataProviderForTestReverseTransform(): iterable
+    {
+        yield 'null' => [
+            null,
+            null,
+        ];
+
+        yield 'optimistic' => [
+            '1,2,3,5,8,13',
+            new Value([1, 2, 3, 5, 8, 13]),
+        ];
+    }
+}