fix(state): improve DX around the generic ObjectProvider

.commitlintrc

@@ -18,7 +18,8 @@
         "openapi",
         "serializer",
         "jsonschema",
-        "validation"
+        "validation",
+        "state"
       ]
     ],
     "scope-empty": [

src/State/CreateProvider.php

@@ -13,6 +13,7 @@
 
 namespace ApiPlatform\State;
 
+use ApiPlatform\Exception\RuntimeException;
 use ApiPlatform\Metadata\Get;
 use ApiPlatform\Metadata\HttpOperation;
 use ApiPlatform\Metadata\Link;
@@ -58,8 +59,11 @@ public function provide(Operation $operation, array $uriVariables = [], array $c
         }
 
         $relation = $this->decorated->provide(new Get(uriVariables: $relationUriVariables, class: $relationClass), $uriVariables);
-        $refl = new \ReflectionClass($operation->getClass());
-        $resource = $refl->newInstanceWithoutConstructor();
+        try {
+            $resource = new ($operation->getClass());
+        } catch (\Throwable $e) {
+            throw new RuntimeException(sprintf('An error occurred while trying to create an instance of the "%s" resource. Consider writing your own "%s" implementation and setting it as `provider` on your operation instead.', $operation->getClass(), ProviderInterface::class), 0, $e);
+        }
         $this->propertyAccessor->setValue($resource, $key, $relation);
 
         return $resource;

src/State/ObjectProvider.php

@@ -13,10 +13,11 @@
 
 namespace ApiPlatform\State;
 
+use ApiPlatform\Exception\RuntimeException;
 use ApiPlatform\Metadata\Operation;
 
 /**
- * An ItemProvider that just create a new object.
+ * An ItemProvider that just creates a new object.
  *
  * @author Antoine Bluchet <soyuka@gmail.com>
  *
@@ -26,8 +27,10 @@ final class ObjectProvider implements ProviderInterface
 {
     public function provide(Operation $operation, array $uriVariables = [], array $context = []): ?object
     {
-        $refl = new \ReflectionClass($operation->getClass());
-
-        return $refl->newInstanceWithoutConstructor();
+        try {
+            return new ($operation->getClass());
+        } catch (\Throwable $e) {
+            throw new RuntimeException(sprintf('An error occurred while trying to create an instance of the "%s" resource. Consider writing your own "%s" implementation and setting it as `provider` on your operation instead.', $operation->getClass(), ProviderInterface::class), 0, $e);
+        }
     }
 }

tests/Fixtures/TestBundle/Entity/DummyResourceWithComplexConstructor.php

@@ -0,0 +1,73 @@
+<?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;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\Get;
+use ApiPlatform\Metadata\Post;
+
+#[Post]
+#[ApiResource(
+    uriTemplate: '/companies/{companyId}/employees/{id}',
+    uriVariables: [
+        'companyId' => ['from_class' => Company::class, 'to_property' => 'company'],
+        'id' => ['from_class' => DummyResourceWithComplexConstructor::class],
+    ]
+)]
+#[Get]
+class DummyResourceWithComplexConstructor
+{
+    private \DateTimeInterface $someInternalTimestamp;
+    private ?Company $company;
+
+    public function __construct(private int $id, private string $name)
+    {
+        $this->someInternalTimestamp = new \DateTimeImmutable();
+    }
+
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    public function getCompany(): Company
+    {
+        return $this->company;
+    }
+
+    public function setCompany(Company $company): void
+    {
+        $this->company = $company;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function setName(string $name): void
+    {
+        $this->name = $name;
+    }
+
+    public function getSomeInternalTimestamp(): \DateTimeInterface
+    {
+        return $this->someInternalTimestamp;
+    }
+
+    public function setSomeInternalTimestamp(\DateTimeInterface $timestamp): void
+    {
+        $this->someInternalTimestamp = $timestamp;
+    }
+}

tests/State/CreateProviderTest.php

@@ -13,12 +13,14 @@
 
 namespace ApiPlatform\Tests\State;
 
+use ApiPlatform\Exception\RuntimeException;
 use ApiPlatform\Metadata\Get;
 use ApiPlatform\Metadata\Link;
 use ApiPlatform\Metadata\Post;
 use ApiPlatform\State\CreateProvider;
 use ApiPlatform\State\ProviderInterface;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\Company;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyResourceWithComplexConstructor;
 use ApiPlatform\Tests\Fixtures\TestBundle\Entity\Employee;
 use PHPUnit\Framework\TestCase;
 use Prophecy\PhpUnit\ProphecyTrait;
@@ -41,6 +43,23 @@ public function testProvide(): void
         $createProvider->provide($operation, ['company' => 1]);
     }
 
+    public function testProvideFailsProperlyOnComplexConstructor(): void
+    {
+        $link = new Link(identifiers: ['id'], fromClass: Company::class, parameterName: 'company');
+        $decorated = $this->prophesize(ProviderInterface::class);
+        $decorated->provide(
+            new Get(uriVariables: ['id' => $link], class: Company::class),
+            ['company' => 1]
+        )->shouldBeCalled()->willReturn(new Company());
+        $operation = new Post(class: DummyResourceWithComplexConstructor::class, uriTemplate: '/company/{company}/employees', uriVariables: ['company' => $link]);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('An error occurred while trying to create an instance of the "ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyResourceWithComplexConstructor" resource. Consider writing your own "ApiPlatform\State\ProviderInterface" implementation and setting it as `provider` on your operation instead.');
+
+        $createProvider = new CreateProvider($decorated->reveal());
+        $createProvider->provide($operation, ['company' => 1]);
+    }
+
     public function testSkipWhenController(): void
     {
         $decorated = $this->prophesize(ProviderInterface::class);

tests/State/ObjectProviderTest.php

@@ -0,0 +1,44 @@
+<?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\State;
+
+use ApiPlatform\Exception\RuntimeException;
+use ApiPlatform\Metadata\Post;
+use ApiPlatform\State\ObjectProvider;
+use ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyResourceWithComplexConstructor;
+use PHPUnit\Framework\TestCase;
+use Prophecy\PhpUnit\ProphecyTrait;
+
+class ObjectProviderTest extends TestCase
+{
+    use ProphecyTrait;
+
+    public function testProvide(): void
+    {
+        $operation = new Post(class: \stdClass::class);
+        $objectProvider = new ObjectProvider();
+        $this->assertInstanceOf(\stdClass::class, $objectProvider->provide($operation));
+    }
+
+    public function testProvideFailsProperlyOnComplexConstructor(): void
+    {
+        $operation = new Post(class: DummyResourceWithComplexConstructor::class);
+
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('An error occurred while trying to create an instance of the "ApiPlatform\Tests\Fixtures\TestBundle\Entity\DummyResourceWithComplexConstructor" resource. Consider writing your own "ApiPlatform\State\ProviderInterface" implementation and setting it as `provider` on your operation instead.');
+
+        $objectProvider = new ObjectProvider();
+        $objectProvider->provide($operation);
+    }
+}