Introduce TypeGuesserInterface

This will guess the field description type from its properties.

src/FieldDescription/TypeGuesserInterface.php

@@ -0,0 +1,22 @@
+<?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\FieldDescription;
+
+use Sonata\AdminBundle\Admin\FieldDescriptionInterface;
+use Symfony\Component\Form\Guess\TypeGuess;
+
+interface TypeGuesserInterface
+{
+    public function guess(FieldDescriptionInterface $fieldDescription): TypeGuess;
+}

src/Request/AdminFetcher.php

@@ -0,0 +1,69 @@
+<?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\Request;
+
+use Sonata\AdminBundle\Admin\AdminInterface;
+use Sonata\AdminBundle\Admin\Pool;
+use Symfony\Component\HttpFoundation\Request;
+
+final class AdminFetcher
+{
+    /**
+     * @var Pool
+     */
+    private $pool;
+
+    public function __construct(Pool $pool)
+    {
+        $this->pool = $pool;
+    }
+
+    public function get(Request $request): AdminInterface
+    {
+        $adminCode = $request->get('_sonata_admin');
+
+        if (null === $adminCode) {
+            // NEXT_MAJOR: Change \RuntimeException by \InvalidArgumentException in the next line.
+            throw new \RuntimeException(sprintf(
+                'There is no `_sonata_admin` defined for the controller `%s` and the current route `%s`.',
+                static::class,
+                $request->get('_route')
+            ));
+        }
+
+        $admin = $this->pool->getAdminByAdminCode($adminCode);
+
+        if (false === $admin) {
+            throw new \RuntimeException(sprintf(
+                'Unable to find the admin class related to the current controller (%s).',
+                static::class
+            ));
+        }
+
+        $rootAdmin = $admin;
+
+        while ($rootAdmin->isChild()) {
+            $rootAdmin->setCurrentChild(true);
+            $rootAdmin = $rootAdmin->getParent();
+        }
+
+        $rootAdmin->setRequest($request);
+
+        if ($request->get('uniqid')) {
+            $admin->setUniqid($request->get('uniqid'));
+        }
+
+        return $admin;
+    }
+}

src/Request/ParamConverter/AdminParamConverter.php

@@ -0,0 +1,49 @@
+<?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\Request\ParamConverter;
+
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter;
+use Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface;
+use Sonata\AdminBundle\Admin\AdminInterface;
+use Sonata\AdminBundle\Request\AdminFetcher;
+use Symfony\Component\HttpFoundation\Request;
+
+final class AdminParamConverter implements ParamConverterInterface
+{
+    /**
+     * @var AdminFetcher
+     */
+    private $adminFetcher;
+
+    public function __construct(AdminFetcher $adminFetcher)
+    {
+        $this->adminFetcher = $adminFetcher;
+    }
+
+    public function apply(Request $request, ParamConverter $configuration): bool
+    {
+        $param = $configuration->getName();
+
+        $admin = $this->adminFetcher->get($request);
+
+        $request->attributes->set($param, $admin);
+
+        return true;
+    }
+
+    public function supports(ParamConverter $configuration): bool
+    {
+        return is_subclass_of($configuration->getClass(), AdminInterface::class);
+    }
+}