feature #61297 [Form] Add form type guesser for EnumType (mttsch)

This PR was merged into the 7.4 branch.

Discussion
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[Form] Add form type guesser for `EnumType`

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Issues        | Fix #61272
| License       | MIT

This new form type guesser guesses the form type of an enum property and also sets the `class` option of the `EnumType` to the relevant enum name.

Commits
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9e8a9235caa [Form] Add form type guesser for `EnumType`

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -83,6 +83,7 @@
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\Finder\Glob;
+use Symfony\Component\Form\EnumFormTypeGuesser;
 use Symfony\Component\Form\Extension\HtmlSanitizer\Type\TextTypeHtmlSanitizerExtension;
 use Symfony\Component\Form\Form;
 use Symfony\Component\Form\FormTypeExtensionInterface;
@@ -881,6 +882,10 @@ private function registerFormConfiguration(array $config, ContainerBuilder $cont
     {
         $loader->load('form.php');
 
+        if (!class_exists(EnumFormTypeGuesser::class)) {
+            $container->removeDefinition('form.type_guesser.enum_type');
+        }
+
         if (null === $config['form']['csrf_protection']['enabled']) {
             $this->writeConfigEnabled('form.csrf_protection', $config['csrf_protection']['enabled'], $config['form']['csrf_protection']);
         }

Resources/config/form.php

@@ -14,6 +14,7 @@
 use Symfony\Component\Form\ChoiceList\Factory\CachingFactoryDecorator;
 use Symfony\Component\Form\ChoiceList\Factory\DefaultChoiceListFactory;
 use Symfony\Component\Form\ChoiceList\Factory\PropertyAccessDecorator;
+use Symfony\Component\Form\EnumFormTypeGuesser;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
 use Symfony\Component\Form\Extension\Core\Type\ColorType;
 use Symfony\Component\Form\Extension\Core\Type\FileType;
@@ -76,6 +77,9 @@
             ->args([service('validator.mapping.class_metadata_factory')])
             ->tag('form.type_guesser')
 
+        ->set('form.type_guesser.enum_type', EnumFormTypeGuesser::class)
+            ->tag('form.type_guesser')
+
         ->alias('form.property_accessor', 'property_accessor')
 
         ->set('form.choice_list_factory.default', DefaultChoiceListFactory::class)