fix(jsonschema) don't skip remaining multiple union types

src/JsonSchema/SchemaFactory.php

@@ -196,10 +196,13 @@
         // property schema is created in SchemaPropertyMetadataFactory, but it cannot build resource reference ($ref)
         // complete property schema with resource reference ($ref) only if it's related to an object
         $version = $schema->getVersion();
-        $subSchema = new Schema($version);
-        $subSchema->setDefinitions($schema->getDefinitions()); // Populate definitions of the main schema
+        $refs = [];
+        $isNullable = null;
 
         foreach ($types as $type) {
+            $subSchema = new Schema($version);
+            $subSchema->setDefinitions($schema->getDefinitions()); // Populate definitions of the main schema
+
             // TODO: in 3.3 add trigger_deprecation() as type factories are not used anymore, we moved this logic to SchemaPropertyMetadataFactory so that it gets cached
             if ($typeFromFactory = $this->typeFactory?->getType($type, 'jsonschema', $propertyMetadata->isReadableLink(), $serializerContext)) {
                 $propertySchema = $typeFromFactory;
@@ -230,14 +233,20 @@
                 break;
             }
 
-            if ($type->isNullable()) {
-                $propertySchema['anyOf'] = [['$ref' => $subSchema['$ref']], ['type' => 'null']];
-            } else {
-                $propertySchema['$ref'] = $subSchema['$ref'];
-            }
+            $refs[] = ['$ref' => $subSchema['$ref']];
+            $isNullable = $isNullable ?? $type->isNullable();
+        }
 
+        if ($isNullable) {
+            $refs[] = ['type' => 'null'];
+        }
+
+        if (($c = \count($refs)) > 1) {
+            $propertySchema['anyOf'] = $refs;
+            unset($propertySchema['type']);
+        } elseif (1 === $c) {
+            $propertySchema['$ref'] = $refs[0]['$ref'];
             unset($propertySchema['type']);
-            break;
         }
 
         $schema->getDefinitions()[$definitionName]['properties'][$normalizedPropertyName] = new \ArrayObject($propertySchema);

tests/Fixtures/TestBundle/ApiResource/Issue6212/Bird.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212;
+
+interface Bird extends \JsonSerializable
+{
+    public function getName(): ?string;
+
+    public function getAge(): ?int;
+}

tests/Fixtures/TestBundle/ApiResource/Issue6212/Robin.php

@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212;
+
+final class Robin implements Bird
+{
+    public ?string $name = null;
+    public ?int $age = null;
+
+    public function getName(): ?string
+    {
+        return $this->name;
+    }
+
+    public function getAge(): ?int
+    {
+        return $this->age;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return get_object_vars($this);
+    }
+}

tests/Fixtures/TestBundle/ApiResource/Issue6212/Wren.php

@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212;
+
+final class Wren implements Bird
+{
+    public ?string $name = null;
+    public ?int $age = null;
+    public ?int $weight = null;
+
+    public function getName(): ?string
+    {
+        return $this->name;
+    }
+
+    public function getAge(): ?int
+    {
+        return $this->age;
+    }
+
+    public function jsonSerialize(): array
+    {
+        return get_object_vars($this);
+    }
+}

tests/Fixtures/TestBundle/Entity/Issue6212/Nest.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\Entity\Issue6212;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212\Bird;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212\Robin;
+use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6212\Wren;
+use Doctrine\ORM\Mapping as ORM;
+
+#[ApiResource]
+#[ORM\Entity]
+class Nest
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column]
+    private ?int $id = null;
+
+    #[ORM\Column(type: 'json')]
+    private ?Bird $owner;
+
+    public function getId(): ?int
+    {
+        return $this->id;
+    }
+
+    public function getOwner(): ?Bird
+    {
+        return $this->owner;
+    }
+
+    public function setOwner(Wren|Robin|null $owner): static
+    {
+        $this->owner = $owner;
+
+        return $this;
+    }
+}

tests/JsonSchema/Command/JsonSchemaGenerateCommandTest.php

@@ -124,6 +124,22 @@ public function testArraySchemaWithReference(): void
         ]);
     }
 
+    public function testArraySchemaWithMultipleUnionTypes(): void
+    {
+        $this->tester->run(['command' => 'api:json-schema:generate', 'resource' => 'ApiPlatform\Tests\Fixtures\TestBundle\Entity\Issue6212\Nest', '--type' => 'output']);
+        $result = $this->tester->getDisplay();
+        $json = json_decode($result, associative: true);
+
+        $this->assertEquals($json['definitions']['Nest.jsonld']['properties']['owner']['anyOf'], [
+            ['$ref' => '#/definitions/Wren.jsonld'],
+            ['$ref' => '#/definitions/Robin.jsonld'],
+            ['type' => 'null'],
+        ]);
+
+        $this->assertArrayHasKey('Wren.jsonld', $json['definitions']);
+        $this->assertArrayHasKey('Robin.jsonld', $json['definitions']);
+    }
+
     /**
      * TODO: add deprecation (TypeFactory will be deprecated in api platform 3.3).
      *