Move $(sourceToTarget|targetToSource)KeyColumns down

lib/Doctrine/ORM/Mapping/ClassMetadata.php

@@ -1726,7 +1726,7 @@ public function setAssociationOverride(string $fieldName, array $overrideMapping
         switch ($mapping['type']) {
             case self::ONE_TO_ONE:
             case self::MANY_TO_ONE:
-                $mapping['sourceToTargetKeyColumns'] = null;
+                $mapping['sourceToTargetKeyColumns'] = [];
                 break;
             case self::MANY_TO_MANY:
                 $mapping['relationToSourceKeyColumns'] = [];

lib/Doctrine/ORM/Mapping/ManyToOneAssociationMapping.php

@@ -9,6 +9,12 @@
  */
 final class ManyToOneAssociationMapping extends ToOneAssociationMapping implements AssociationOwningSideMapping
 {
+    /** @var array<string, string> */
+    public array $sourceToTargetKeyColumns = [];
+
+    /** @var array<string, string> */
+    public array $targetToSourceKeyColumns = [];
+
     /** @var list<JoinColumnMapping> */
     public array $joinColumns = [];
 
@@ -18,6 +24,8 @@ public function __sleep(): array
         $serialized = parent::__sleep();
 
         $serialized[] = 'joinColumns';
+        $serialized[] = 'sourceToTargetKeyColumns';
+        $serialized[] = 'targetToSourceKeyColumns';
 
         return $serialized;
     }

lib/Doctrine/ORM/Mapping/OneToOneOwningSideMapping.php

@@ -6,6 +6,12 @@
 
 final class OneToOneOwningSideMapping extends OneToOneAssociationMapping implements AssociationOwningSideMapping
 {
+    /** @var array<string, string> */
+    public array $sourceToTargetKeyColumns = [];
+
+    /** @var array<string, string> */
+    public array $targetToSourceKeyColumns = [];
+
     /** @var list<JoinColumnMapping> */
     public array $joinColumns = [];
 
@@ -15,6 +21,8 @@ public function __sleep(): array
         $serialized = parent::__sleep();
 
         $serialized[] = 'joinColumns';
+        $serialized[] = 'sourceToTargetKeyColumns';
+        $serialized[] = 'targetToSourceKeyColumns';
 
         return $serialized;
     }

lib/Doctrine/ORM/Mapping/ToOneAssociationMapping.php

@@ -13,12 +13,6 @@
 
 abstract class ToOneAssociationMapping extends AssociationMapping
 {
-    /** @var array<string, string>|null */
-    public array|null $sourceToTargetKeyColumns = null;
-
-    /** @var array<string, string>|null */
-    public array|null $targetToSourceKeyColumns = null;
-
     /**
      * @param array<string, mixed> $mappingArray
      * @psalm-param array{
@@ -171,20 +165,4 @@ public function toArray(): array
 
         return $array;
     }
-
-    /** @return list<string> */
-    public function __sleep(): array
-    {
-        $serialized = parent::__sleep();
-
-        if ($this->sourceToTargetKeyColumns !== null) {
-            $serialized[] = 'sourceToTargetKeyColumns';
-        }
-
-        if ($this->targetToSourceKeyColumns !== null) {
-            $serialized[] = 'targetToSourceKeyColumns';
-        }
-
-        return $serialized;
-    }
 }

lib/Doctrine/ORM/Persisters/Entity/JoinedSubclassPersister.php

@@ -14,7 +14,6 @@
 use Doctrine\ORM\Utility\PersisterHelper;
 
 use function array_combine;
-use function assert;
 use function implode;
 
 /**
@@ -476,7 +475,6 @@ protected function getInsertColumnList(): array
             if (isset($this->class->associationMappings[$name])) {
                 $assoc = $this->class->associationMappings[$name];
                 if ($assoc->isToOneOwningSide()) {
-                    assert($assoc->targetToSourceKeyColumns !== null);
                     foreach ($assoc->targetToSourceKeyColumns as $sourceCol) {
                         $columns[] = $sourceCol;
                     }

lib/Doctrine/ORM/Query/SqlWalker.php

@@ -597,12 +597,13 @@ public function walkPathExpression(AST\PathExpression $pathExpr): string
                 }
 
                 $assoc = $class->associationMappings[$fieldName];
-                assert($assoc->isToOne());
 
                 if (! $assoc->isOwningSide()) {
                     throw QueryException::associationPathInverseSideNotSupported($pathExpr);
                 }
 
+                assert($assoc->isToOneOwningSide());
+
                 // COMPOSITE KEYS NOT (YET?) SUPPORTED
                 if (count($assoc['sourceToTargetKeyColumns']) > 1) {
                     throw QueryException::associationPathCompositeKeyNotSupported();
@@ -612,7 +613,6 @@ public function walkPathExpression(AST\PathExpression $pathExpr): string
                     $sql .= $this->getSQLTableAlias($class->getTableName(), $dqlAlias) . '.';
                 }
 
-                assert($assoc->targetToSourceKeyColumns !== null);
                 $sql .= reset($assoc->targetToSourceKeyColumns);
                 break;
 
@@ -799,17 +799,17 @@ public function walkIndexBy(AST\IndexBy $indexBy): void
                 }
 
                 $association = $class->associationMappings[$fieldName];
-                assert($association->isToOne());
 
                 if (! $association->isOwningSide()) {
                     throw QueryException::associationPathInverseSideNotSupported($pathExpression);
                 }
 
-                if (count($association['sourceToTargetKeyColumns']) > 1) {
+                assert($association->isToOneOwningSide());
+
+                if (count($association->sourceToTargetKeyColumns) > 1) {
                     throw QueryException::associationPathCompositeKeyNotSupported();
                 }
 
-                assert($association->targetToSourceKeyColumns !== null);
                 $field = reset($association->targetToSourceKeyColumns);
                 break;
 

tests/Doctrine/Tests/ORM/Mapping/ManyToOneAssociationMappingTest.php

@@ -22,11 +22,15 @@ public function testItSurvivesSerialization(): void
             targetEntity: self::class,
         );
 
-        $mapping->joinColumns = [new JoinColumnMapping('id')];
+        $mapping->joinColumns              = [new JoinColumnMapping('id')];
+        $mapping->sourceToTargetKeyColumns = ['foo' => 'bar'];
+        $mapping->targetToSourceKeyColumns = ['bar' => 'foo'];
 
         $resurrectedMapping = unserialize(serialize($mapping));
         assert($resurrectedMapping instanceof ManyToOneAssociationMapping);
 
         self::assertCount(1, $resurrectedMapping->joinColumns);
+        self::assertSame(['foo' => 'bar'], $resurrectedMapping->sourceToTargetKeyColumns);
+        self::assertSame(['bar' => 'foo'], $resurrectedMapping->targetToSourceKeyColumns);
     }
 }

tests/Doctrine/Tests/ORM/Mapping/OneToOneOwningSideMappingTest.php

@@ -22,11 +22,15 @@ public function testItSurvivesSerialization(): void
             targetEntity: self::class,
         );
 
-        $mapping->joinColumns = [new JoinColumnMapping('id')];
+        $mapping->joinColumns              = [new JoinColumnMapping('id')];
+        $mapping->sourceToTargetKeyColumns = ['foo' => 'bar'];
+        $mapping->targetToSourceKeyColumns = ['bar' => 'foo'];
 
         $resurrectedMapping = unserialize(serialize($mapping));
         assert($resurrectedMapping instanceof OneToOneOwningSideMapping);
 
         self::assertCount(1, $resurrectedMapping->joinColumns);
+        self::assertSame(['foo' => 'bar'], $resurrectedMapping->sourceToTargetKeyColumns);
+        self::assertSame(['bar' => 'foo'], $resurrectedMapping->targetToSourceKeyColumns);
     }
 }