first version

kirby/config/sections/mixins/parent.php

@@ -0,0 +1,29 @@
+<?php
+
+use Kirby\Toolkit\Str;
+
+return [
+    'props' => [
+        /**
+         * Sets the query to a parent to find items for the list
+         */
+        'parent' => function (string $parent = null) {
+            return $parent;
+        }
+    ],
+    'methods' => [
+        'parentModel' => function () {
+            $parent = $this->parent;
+
+            if (is_string($parent) === true) {
+                $parent = $this->model->query($parent);
+            }
+
+            if ($parent === null) {
+                return $this->model;
+            }
+
+            return $parent;
+        }
+    ]
+];