fix #15

site/models/category.php

@@ -0,0 +1,23 @@
+<?php
+
+use Kirby\Cms\Pages;
+use Kirby\Cms\Page;
+use Kirby\Uuid\Uuid;
+
+class CategoryPage extends Page
+{
+    public function children(): Pages
+    {
+        $category = $this->title()->value();
+        $allTexts = page("textes")->grandChildren();
+        $textsInCategory = $allTexts->filterBy('category', $category);
+
+        $children = new Pages();
+
+        foreach ($textsInCategory as $text) {
+            $children->add($text);
+        }
+
+        return $children; 
+    }
+}