Add AdminInterface::createNewInstance method

Instead of overriding ModelManagerInterface::getModelInstance to
custom construct their objects, now the user can do it from the
related Admin class.

The Instantiator class will be use in 4.0 and its code is copied
from the persistence bundles.

UPGRADE-3.x.md

@@ -1,6 +1,13 @@
 UPGRADE 3.x
 ===========
 
+UPGRADE FROM 3.xx to 3.xx
+=========================
+
+### Deprecated `Sonata\AdminBundle\Model\ModelManagerInterface::getModelInstance()` method.
+
+Use `Sonata\AdminBundle\Admin\AbstractAdmin::createNewInstance()` method instead.
+
 UPGRADE FROM 3.88 to 3.89
 =========================
 

src/Admin/AbstractAdmin.php

@@ -30,6 +30,8 @@
 use Sonata\AdminBundle\Security\Handler\AclSecurityHandlerInterface;
 use Sonata\AdminBundle\Show\ShowMapper;
 use Sonata\AdminBundle\Templating\MutableTemplateRegistryInterface;
+// NEXT_MAJOR: Uncomment next line.
+// use Sonata\AdminBundle\Util\Instantiator;
 use Sonata\Form\Validator\Constraints\InlineConstraint;
 use Sonata\Form\Validator\ErrorElement;
 use Symfony\Component\Form\Extension\Core\Type\HiddenType;
@@ -1247,7 +1249,7 @@ public function getTemplate($name)
      */
     public function getNewInstance()
     {
-        $object = $this->getModelManager()->getModelInstance($this->getClass());
+        $object = $this->createNewInstance();
 
         $this->appendParentObject($object);
         $this->alterNewInstance($object);
@@ -2887,6 +2889,17 @@ final public function hasTemplateRegistry(): bool
         return null !== $this->templateRegistry;
     }
 
+    /**
+     * @phpstan-return T
+     */
+    protected function createNewInstance(): object
+    {
+        // NEXT_MAJOR: Uncomment next line and remove the other one.
+        // return Instantiator::instantiate($this->getClass());
+        /* @phpstan-ignore-next-line */
+        return $this->getModelManager()->getModelInstance($this->getClass(), 'sonata_deprecation_mute');
+    }
+
     /**
      * @phpstan-param T $object
      */

src/Model/ModelManagerInterface.php

@@ -191,6 +191,8 @@ public function getUrlSafeIdentifier($model);
     /**
      * Create a new instance of the model of the specified class.
      *
+     * @deprecated since sonata-project/admin-bundle 3.x. To be removed in 4.0. Use AdminInterface::createNewInstance instead.
+     *
      * @param string $class
      *
      * @return object

src/Util/Instantiator.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Sonata Project package.
+ *
+ * (c) Thomas Rabaix <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Sonata\AdminBundle\Util;
+
+/**
+ * @internal
+ */
+final class Instantiator
+{
+    /**
+     * @template T of object
+     * @phpstan-param class-string<T> $class
+     * @phpstan-return T
+     */
+    public static function instantiate(string $class): object
+    {
+        $r = new \ReflectionClass($class);
+        if ($r->isAbstract()) {
+            throw new \RuntimeException(sprintf('Cannot initialize abstract class: %s', $class));
+        }
+
+        $constructor = $r->getConstructor();
+
+        if (null !== $constructor && (!$constructor->isPublic() || $constructor->getNumberOfRequiredParameters() > 0)) {
+            return $r->newInstanceWithoutConstructor();
+        }
+
+        return new $class();
+    }
+}

tests/Admin/AdminTest.php

@@ -1627,13 +1627,13 @@ public function testGetNewInstanceForChildAdminWithCollectionParentValue(): void
         $formBuilder = $this->createStub(FormBuilderInterface::class);
         $formBuilder->method('getForm')->willReturn(null);
 
-        $postCategory = new PostCategory();
+        $postCategoryAdmin = new PostCategoryAdmin('admin.post_category', PostCategory::class, 'MyBundle\MyController');
 
+        // NEXT_MAJOR: Remove next three lines related to model manager.
         $modelManager = $this->createStub(ModelManagerInterface::class);
-        $modelManager->method('getModelInstance')->willReturn($postCategory);
-
-        $postCategoryAdmin = new PostCategoryAdmin('admin.post_category', PostCategoryAdmin::class, 'MyBundle\MyController');
+        $modelManager->method('getModelInstance')->willReturn(new PostCategory());
         $postCategoryAdmin->setModelManager($modelManager);
+
         $postCategoryAdmin->setParent($postAdmin);
 
         $request = $this->createStub(Request::class);
@@ -1662,13 +1662,13 @@ public function testGetNewInstanceForEmbededAdminWithParentValue(): void
         $parentField->method('getParentAssociationMappings')->willReturn([]);
         $parentField->method('getAssociationMapping')->willReturn(['fieldName' => 'tag', 'mappedBy' => 'post']);
 
-        $tag = new Tag();
+        $tagAdmin = new TagAdmin('admin.tag', Tag::class, 'MyBundle\MyController');
 
+        // NEXT_MAJOR: Remove next three lines related to model manager.
         $modelManager = $this->createStub(ModelManagerInterface::class);
-        $modelManager->method('getModelInstance')->willReturn($tag);
-
-        $tagAdmin = new TagAdmin('admin.tag', Tag::class, 'MyBundle\MyController');
+        $modelManager->method('getModelInstance')->willReturn(new Tag());
         $tagAdmin->setModelManager($modelManager);
+
         $tagAdmin->setParentFieldDescription($parentField);
 
         $request = $this->createStub(Request::class);

tests/App/Admin/FooAdmin.php

@@ -25,7 +25,7 @@
 
 class FooAdmin extends AbstractAdmin
 {
-    public function getNewInstance()
+    public function createNewInstance(): object
     {
         return new Foo('test_id', 'foo_name');
     }

tests/App/Admin/TranslatedAdmin.php

@@ -18,10 +18,16 @@
 use Sonata\AdminBundle\Datagrid\ListMapper;
 use Sonata\AdminBundle\Form\FormMapper;
 use Sonata\AdminBundle\Show\ShowMapper;
+use Sonata\AdminBundle\Tests\App\Model\Translated;
 use Symfony\Component\Form\Extension\Core\Type\TextType;
 
 final class TranslatedAdmin extends AbstractAdmin
 {
+    public function createNewInstance(): object
+    {
+        return new Translated();
+    }
+
     protected function configureListFields(ListMapper $list): void
     {
         $list->add('name_list', FieldDescriptionInterface::TYPE_STRING);

tests/App/Model/ModelManager.php

@@ -110,6 +110,9 @@ public function getUrlSafeIdentifier($model)
         return $model->getId();
     }
 
+    /**
+     * NEXT_MAJOR: Remove this method.
+     */
     public function getModelInstance($class)
     {
         switch ($class) {