#6759 showstopper one-to-one inverse not being loaded with correct identifier restrictions when defining joinColumn

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

@@ -792,6 +792,8 @@ public function loadOneToOneEntity(array $assoc, $sourceEntity, array $identifie
         $sourceClass = $this->em->getClassMetadata($assoc['sourceEntity']);
         $owningAssoc = $targetClass->getAssociationMapping($assoc['mappedBy']);
 
+        $computedIdentifier = [];
+
         // TRICKY: since the association is specular source and target are flipped
         foreach ($owningAssoc['targetToSourceKeyColumns'] as $sourceKeyColumn => $targetKeyColumn) {
             if ( ! isset($sourceClass->fieldNames[$sourceKeyColumn])) {
@@ -800,15 +802,11 @@ public function loadOneToOneEntity(array $assoc, $sourceEntity, array $identifie
                 );
             }
 
-            // unset the old value and set the new sql aliased value here. By definition
-            // unset($identifier[$targetKeyColumn] works here with how UnitOfWork::createEntity() calls this method.
-            $identifier[$targetClass->getFieldForColumn($targetKeyColumn)] =
+            $computedIdentifier[$targetClass->getFieldForColumn($targetKeyColumn)] =
                 $sourceClass->reflFields[$sourceClass->fieldNames[$sourceKeyColumn]]->getValue($sourceEntity);
-
-            unset($identifier[$targetKeyColumn]);
         }
 
-        $targetEntity = $this->load($identifier, null, $assoc);
+        $targetEntity = $this->load($computedIdentifier, null, $assoc);
 
         if ($targetEntity !== null) {
             $targetClass->setFieldValue($targetEntity, $assoc['mappedBy'], $sourceEntity);

tests/Doctrine/Tests/Models/OneToOneInverseSideLoad/InverseSide.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\Models\OneToOneInverseSideLoad;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @Entity()
+ * @Table(name="one_to_one_inverse_side_load_inverse")
+ */
+class InverseSide
+{
+    /**
+     * @Id()
+     * @Column(type="string")
+     * @GeneratedValue(strategy="NONE")
+     */
+    public $id;
+
+    /**
+     * @OneToOne(targetEntity=OwningSide::class, mappedBy="inverse")
+     */
+    public $owning;
+}

tests/Doctrine/Tests/Models/OneToOneInverseSideLoad/OwningSide.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\Models\OneToOneInverseSideLoad;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * @Entity()
+ * @Table(name="one_to_one_inverse_side_load_owning")
+ */
+class OwningSide
+{
+    /**
+     * @Id()
+     * @Column(type="string")
+     * @GeneratedValue(strategy="NONE")
+     */
+    public $id;
+
+    /**
+     * Owning side
+     *
+     * @OneToOne(targetEntity=InverseSide::class, inversedBy="owning")
+     * @JoinColumn(nullable=false, name="inverse")
+     */
+    public $inverse;
+}

tests/Doctrine/Tests/ORM/Functional/OneToOneInverseSideLoadAfterDqlQueryTest.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional;
+
+use Doctrine\ORM\Tools\ToolsException;
+use Doctrine\Tests\Models\OneToOneInverseSideLoad\InverseSide;
+use Doctrine\Tests\Models\OneToOneInverseSideLoad\OwningSide;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class OneToOneInverseSideLoadAfterDqlQueryTest extends OrmFunctionalTestCase
+{
+    protected function setUp()
+    {
+        parent::setUp();
+
+        try {
+            $this->_schemaTool->createSchema([
+                $this->_em->getClassMetadata(OwningSide::class),
+                $this->_em->getClassMetadata(InverseSide::class),
+            ]);
+        } catch(ToolsException $e) {
+            // ignored
+        }
+    }
+
+    /**
+     * @group #6759
+     */
+    public function testInverseSideOneToOneLoadedAfterDqlQuery(): void
+    {
+        $owner   = new OwningSide();
+        $inverse = new InverseSide();
+
+        $owner->id       = 'owner';
+        $inverse->id     = 'inverse';
+        $owner->inverse  = $inverse;
+        $inverse->owning = $owner;
+
+        $this->_em->persist($owner);
+        $this->_em->persist($inverse);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        /* @var $fetchedInverse InverseSide */
+        $fetchedInverse = $this
+            ->_em
+            ->createQueryBuilder()
+            ->select('inverse')
+            ->from(InverseSide::class, 'inverse')
+            ->andWhere('inverse.id = :id')
+            ->setParameter('id', 'inverse')
+            ->getQuery()
+            ->getSingleResult();
+
+        self::assertInstanceOf(InverseSide::class, $fetchedInverse);
+        self::assertInstanceOf(OwningSide::class, $fetchedInverse->owning);
+
+        $this->assertSQLEquals(
+            'select o0_.id as id_0 from one_to_one_inverse_side_load_inverse o0_ where o0_.id = ?',
+            $this->_sqlLoggerStack->queries[$this->_sqlLoggerStack->currentQuery - 1]['sql']
+        );
+
+        $this->assertSQLEquals(
+            'select t0.id as id_1, t0.inverse as inverse_2 from one_to_one_inverse_side_load_owning t0 WHERE t0.inverse = ?',
+            $this->_sqlLoggerStack->queries[$this->_sqlLoggerStack->currentQuery]['sql']
+        );
+    }
+}