Fix deprecation warning on CakePHP 5.2

Author: ADmad

src/View/Helper/FormHelper.php

@@ -214,6 +214,7 @@ class FormHelper extends CoreFormHelper
             '{{hidden}}<label{{attrs}}>{{input}}{{text}}{{tooltip}}</label>',
         'submitContainer' =>
             '<div{{containerAttrs}} class="{{containerClass}}submit">{{content}}</div>',
+        'errorClass' => 'is-invalid',
     ];
 
     /**
@@ -342,7 +343,6 @@ public function __construct(View $View, array $config = [])
     {
         $this->_defaultConfig = [
             'align' => static::ALIGN_DEFAULT,
-            'errorClass' => 'is-invalid',
             'grid' => [
                 static::GRID_COLUMN_ONE => 2,
                 static::GRID_COLUMN_TWO => 10,
@@ -380,6 +380,11 @@ public function create(mixed $context = null, array $options = []): string
             'spacing' => null,
         ];
 
+        // This is only for backwards compatibility with CakePHP < 5.2
+        if ($this->getConfig('errorClass')) {
+            $this->setConfig('templates.errorClass', $this->getConfig('errorClass'));
+        }
+
         return parent::create($context, $this->_processFormOptions($options));
     }
 
@@ -498,7 +503,7 @@ public function control(string $fieldName, array $options = []): string
             isset($options['append']) ||
             isset($options['prepend'])
         ) {
-            $options['injectErrorClass'] = $this->_config['errorClass'];
+            $options['injectErrorClass'] = $this->getConfig('templates.errorClass');
         }
 
         unset(

tests/bootstrap.php

@@ -75,6 +75,11 @@
 ]);
 
 Cache::setConfig([
+    '_cake_translations_' => [
+        'engine' => 'File',
+        'prefix' => 'cake_translations_',
+        'serialize' => true,
+    ],
     '_cake_core_' => [
         'engine' => 'File',
         'prefix' => 'cake_core_',