Add error handling when misuse of find() with array values

src/UnitOfWork.php

@@ -67,6 +67,7 @@
 use function in_array;
 use function is_array;
 use function is_object;
+use function is_scalar;
 use function reset;
 use function spl_object_id;
 use function sprintf;
@@ -1565,7 +1566,23 @@ final public static function getIdHashByIdentifier(array $identifier): string
 
  return implode(
  ' ',
- $identifier,
+ array_map(
+ static function ($value) {
+ if ($value instanceof BackedEnum) {
+ return $value->value;
+ }
+
+ if (! is_scalar($value) && ! ($value instanceof Stringable)) {
+ throw new UnexpectedValueException(sprintf(
+ 'Unexpected identifier value: Expecting scalar or Stringable, got %s.',
+ get_debug_type($value),
+ ));
+ }
+
+ return $value;
+ },
+ $identifier,
+ ),
  );
  }
 

tests/Tests/ORM/Functional/IdentifierFunctionalTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional;
+
+use Doctrine\Tests\Models\CMS\CmsUser;
+use Doctrine\Tests\OrmFunctionalTestCase;
+use UnexpectedValueException;
+
+class IdentifierFunctionalTest extends OrmFunctionalTestCase
+{
+ protected function setUp(): void
+ {
+ $this->useModelSet('cms');
+
+ parent::setUp();
+ }
+
+ public function testIdentifierArrayValue(): void
+ {
+ $this->expectException(UnexpectedValueException::class);
+ $this->expectExceptionMessage('Unexpected identifier value: Expecting scalar or Stringable, got array.');
+ $this->_em->find(CmsUser::class, ['id' => ['array']]);
+ }
+}