fix(filter): Do not nest array while generating default schema

src/Doctrine/Common/Filter/OpenApiFilterTrait.php

@@ -28,7 +28,11 @@ public function getOpenApiParameters(Parameter $parameter): OpenApiParameter|arr
             return new OpenApiParameter(name: $parameter->getKey(), in: 'query');
         }
 
-        $arraySchema = ['type' => 'array', 'items' => $schema ?? ['type' => 'string']];
+        if ('array' === ($schema['type'] ?? null)) {
+            $arraySchema = $schema;
+        } else {
+            $arraySchema = ['type' => 'array', 'items' => $schema ?? ['type' => 'string']];
+        }
 
         return new OpenApiParameter(name: $parameter->getKey().'[]', in: 'query', style: 'deepObject', explode: true, schema: $arraySchema);
     }

tests/Fixtures/TestBundle/Entity/ProductWithQueryParameter.php

@@ -61,6 +61,11 @@
                     property: 'tags',
                     schema: ['anyOf' => [['type' => 'array', 'items' => ['type' => 'string']], ['type' => 'string']]]
                 ),
+                'listOfTags' => new QueryParameter(
+                    filter: new ExactFilter(),
+                    property: 'tags',
+                    schema: ['type' => 'array', 'items' => ['type' => 'string']],
+                ),
             ]
         ),
     ]

tests/Functional/Parameters/DoctrineTest.php

@@ -430,6 +430,14 @@ public static function openApiParameterDocumentationProvider(): array
                 'expectedDescription' => '',
                 'expectedSchema' => ['type' => 'array', 'items' => ['anyOf' => [['type' => 'array', 'items' => ['type' => 'string']], ['type' => 'string']]]],
             ],
+            'with schema and default castToArray should not wrap schema in array type if already an array' => [
+                'parameterName' => 'listOfTags',
+                'shouldHaveArrayNotation' => true,
+                'expectedStyle' => 'deepObject',
+                'expectedExplode' => true,
+                'expectedDescription' => '',
+                'expectedSchema' => ['type' => 'array', 'items' => ['type' => 'string']],
+            ],
         ];
     }
 }