EditAlbum: make parent selection more intuitive

controllers/EditAlbum.php

@@ -61,13 +61,24 @@ class EditAlbum extends HTMLController
 		elseif (!$id_tag)
 			$after_form = '<button name="submit_and_new" class="btn">Save and add another</button>';
 
+		// Gather possible parents for this album to be filed into
+		$parentChoices = [0 => '-root-'];
+		foreach (PhotoAlbum::getHierarchy('tag', 'up') as $parent)
+		{
+			if (!empty($id_tag) && $parent['id_tag'] == $id_tag)
+				continue;
+
+			$parentChoices[$parent['id_tag']] = $parent['tag'];
+		}
+
 		$form = new Form([
 			'request_url' => BASEURL . '/editalbum/?' . ($id_tag ? 'id=' . $id_tag : 'add'),
 			'content_below' => $after_form,
 			'fields' => [
 				'id_parent' => [
-					'type' => 'numeric',
+					'type' => 'select',
-					'label' => 'Parent album ID',
+					'label' => 'Parent album',
+					'options' => $parentChoices,
 				],
 				'id_asset_thumb' => [
 					'type' => 'numeric',
@@ -127,6 +138,12 @@ class EditAlbum extends HTMLController
 
 			$data = $form->getData();
 
+			// Sanity check: don't let an album be its own parent
+			if ($data['id_parent'] == $id_tag)
+			{
+				return $formview->adopt(new Alert('Invalid parent', 'An album cannot be its own parent.', 'danger'));
+			}
+
 			// Quick stripping.
 			$data['tag'] = htmlentities($data['tag']);
 			$data['description'] = htmlentities($data['description']);