Add DotEncodingParamResolver

config/definition.php

@@ -21,6 +21,7 @@
                     ->addDefaultsIfNotSet()
                     ->children()
                         ->booleanNode('property_path')->defaultTrue()->end()
+                        ->booleanNode('dot_encoding')->defaultFalse()->end()
                     ->end()
                 ->end()
                 ->arrayNode('message_resolver')

config/services/param_resolver.php

@@ -4,6 +4,7 @@
 
 use SBSEDV\Bundle\FormBundle\ParamResolver\ChainParamResolver;
 use SBSEDV\Bundle\FormBundle\ParamResolver\ConstraintViolationCustomErrorKeyParamResolver;
+use SBSEDV\Bundle\FormBundle\ParamResolver\DotEncodingParamResolver;
 use SBSEDV\Bundle\FormBundle\ParamResolver\ParamResolverInterface;
 use SBSEDV\Bundle\FormBundle\ParamResolver\PropertyPathParamResolver;
 
@@ -17,6 +18,9 @@
         ->set(PropertyPathParamResolver::class)
             ->tag('sbsedv_form.param_resolver', ['priority' => -9999])
 
+        ->set(DotEncodingParamResolver::class)
+            ->tag('sbsedv_form.param_resolver', ['priority' => -9999])
+
         ->set(ConstraintViolationCustomErrorKeyParamResolver::class)
             ->tag('sbsedv_form.param_resolver')
 

src/ParamResolver/DotEncodingParamResolver.php

@@ -0,0 +1,45 @@
+<?php declare(strict_types=1);
+
+namespace SBSEDV\Bundle\FormBundle\ParamResolver;
+
+use Symfony\Component\Form\FormError;
+
+/**
+ * @example key
+ * @example key.nested
+ * @example key.nested.deeply
+ */
+class DotEncodingParamResolver implements ParamResolverInterface
+{
+    public function resolveParam(FormError $formError): ?string
+    {
+        $origin = $formError->getOrigin();
+
+        // this SHOULD NEVER happen
+        if (null === $origin) {
+            return null;
+        }
+
+        $keys = [(string) $origin->getPropertyPath()];
+
+        $parent = $origin->getParent();
+        while ($parent !== null && $parent->getName() !== '') {
+            $keys[] = (string) $parent->getPropertyPath();
+            $parent = $parent->getParent();
+        }
+
+        $keys = \array_reverse($keys);
+        foreach ($keys as $k => $v) {
+            $keys[$k] = \str_replace(['[', ']'], '', $v);
+        }
+
+        $key = \implode('.', $keys);
+
+        // @phpstan-ignore-next-line
+        if ('' === $key) {
+            return null;
+        }
+
+        return $key;
+    }
+}

src/ParamResolver/PropertyPathParamResolver.php

@@ -4,6 +4,11 @@
 
 use Symfony\Component\Form\FormError;
 
+/**
+ * @example key
+ * @example key[nested]
+ * @example key[nested][deeply]
+ */
 class PropertyPathParamResolver implements ParamResolverInterface
 {
     public function resolveParam(FormError $formError): ?string

src/SBSEDVFormBundle.php

@@ -63,6 +63,10 @@ public function loadExtension(array $config, ContainerConfigurator $container, C
         if (!$config['param_resolver']['property_path']) {
             $container->services()->remove(ParamResolver\PropertyPathParamResolver::class);
         }
+
+        if (!$config['param_resolver']['dot_encoding']) {
+            $container->services()->remove(ParamResolver\DotEncodingParamResolver::class);
+        }
     }
 
     public function configure(DefinitionConfigurator $definition): void