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site/models/album.php

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+<?php
+
+/**
+ * Page models extend Kirby's default page object.
+ *
+ * In page models you can define methods that are then available
+ * everywhere in Kirby where you call a page of the extended type.
+ *
+ * In this example, we define the cover method that either returns
+ * an image selected in the cover field or the first image in the folder.
+ *
+ * You can see the method in use in the `home.php` and `photography.php` templates
+ * and in the `site/blueprints/sections/albums.yml` image query
+ *
+ * More about models: https://getkirby.com/docs/guide/templates/page-models
+ */
+class AlbumPage extends Page
+{
+    public function cover()
+    {
+        return $this->content()->get('cover')->toFile() ?? $this->image();
+    }
+}