From cfb1fce8338cc1bfa61cb3109c3a0fa28ae76cd3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Edi=20Modri=C4=87?= <edi.modric@gmail.com>
Date: Mon, 4 May 2020 10:08:08 +0200
Subject: [PATCH] Support using core RelationList value in the field type
 override

---
 bundle/Core/FieldType/RelationList/Type.php | 30 ++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/bundle/Core/FieldType/RelationList/Type.php b/bundle/Core/FieldType/RelationList/Type.php
index f9aafb90..1a7d8e14 100644
--- a/bundle/Core/FieldType/RelationList/Type.php
+++ b/bundle/Core/FieldType/RelationList/Type.php
@@ -6,6 +6,7 @@
 
 use eZ\Publish\Core\Base\Exceptions\InvalidArgumentType;
 use eZ\Publish\Core\FieldType\RelationList\Type as BaseRelationListType;
+use eZ\Publish\Core\FieldType\RelationList\Value as BaseRelationListValue;
 use eZ\Publish\Core\FieldType\Value as BaseValue;
 use eZ\Publish\SPI\FieldType\Value as SPIValue;
 
@@ -63,7 +64,34 @@ protected function createValueFromInput($inputValue)
             return new Value($destinationContentIds, $destinationLocationIds);
         }
 
-        return parent::createValueFromInput($inputValue);
+        $parentValue = parent::createValueFromInput($inputValue);
+
+        if (
+            $parentValue instanceof BaseRelationListValue &&
+            !$parentValue instanceof Value
+        ) {
+            return new Value($parentValue->destinationContentIds);
+        }
+
+        return $parentValue;
+    }
+
+    protected static function checkValueType($value): void
+    {
+        if ($value instanceof BaseRelationListValue) {
+            // Includes overridden type too
+            return;
+        }
+
+        throw new InvalidArgumentType(
+            '$value',
+            sprintf(
+                '"%s" or "%s"',
+                BaseRelationListValue::class,
+                Value::class
+            ),
+            $value
+        );
     }
 
     protected function checkValueStructure(BaseValue $value): void