add support for display of error message using wildcard (*)

Author: sammyskills

system/Helpers/form_helper.php

@@ -741,17 +741,20 @@ function validation_show_error(string $field, string $template = 'single'): stri
         $config = config('Validation');
         $view   = Services::renderer();
 
-        $errors = validation_errors();
+        $errors = array_filter(validation_errors(), static fn ($key) => preg_match(
+            '/^' . str_replace(['\.\*', '\*\.'], ['\..+', '.+\.'], preg_quote($field, '/')) . '$/',
+            $key
+        ), ARRAY_FILTER_USE_KEY);
 
-        if (! array_key_exists($field, $errors)) {
+        if ($errors === []) {
             return '';
         }
 
         if (! array_key_exists($template, $config->templates)) {
             throw ValidationException::forInvalidTemplate($template);
         }
 
-        return $view->setVar('error', $errors[$field])
+        return $view->setVar('error', implode("\n", $errors))
             ->render($config->templates[$template]);
     }
 }

tests/system/Helpers/FormHelperTest.php

@@ -996,6 +996,16 @@ public function testValidationShowError()
         $this->assertSame('<span class="help-block">The ID field is required.</span>' . "\n", $html);
     }
 
+    public function testValidationShowErrorForWildcards()
+    {
+        $validation = Services::validation();
+        $validation->setRule('user.0.name', 'Name', 'required')->run([]);
+
+        $html = validation_show_error('user.*.name');
+
+        $this->assertSame('<span class="help-block">The Name field is required.</span>' . "\n", $html);
+    }
+
     public function testFormParseFormAttributesTrue()
     {
         $expected = 'readonly ';