Create "KeyNested" rule

library/Exceptions/KeyNestedException.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Respect/Validation.
+ *
+ * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ *
+ * For the full copyright and license information, please view the "LICENSE.md"
+ * file that was distributed with this source code.
+ */
+
+namespace Respect\Validation\Exceptions;
+
+class KeyNestedException extends AttributeException
+{
+    public static $defaultTemplates = array(
+        self::MODE_DEFAULT => array(
+            self::NOT_PRESENT => 'No items were found for key chain {{name}}',
+            self::INVALID => 'Key chain {{name}} is not valid',
+        ),
+        self::MODE_NEGATIVE => array(
+            self::NOT_PRESENT => 'Items for key chain {{name}} must not be present',
+            self::INVALID => 'Key chain {{name}} must not be valid',
+        ),
+    );
+}