Add marker sorting

module/dca/tl_leaflet_marker.php

@@ -23,7 +23,7 @@ $GLOBALS['TL_DCA']['tl_leaflet_marker'] = array
         'sorting' => array
         (
             'mode'                    => 4,
-            'fields'                  => array('title'),
+            'fields'                  => array('sorting'),
             'flag'                    => 1,
             'headerFields'            => array('title', 'type'),
             'child_record_callback'   => array('Netzmacht\Contao\Leaflet\Dca\Marker', 'generateRow'),
@@ -123,6 +123,10 @@ $GLOBALS['TL_DCA']['tl_leaflet_marker'] = array
         (
             'sql' => "int(10) unsigned NOT NULL default '0'"
         ),
+        'sorting'               => array
+        (
+            'sql' => "int(10) unsigned NOT NULL default '0'"
+        ),
         'pid'          => array
         (
             'sql' => "int(10) unsigned NOT NULL default '0'"

src/Netzmacht/Contao/Leaflet/Mapper/Layer/MarkersLayerMapper.php

@@ -107,7 +107,8 @@ class MarkersLayerMapper extends AbstractLayerMapper implements GeoJsonMapper
     {
         $collection = MarkerModel::findBy(
             array('active=1', 'pid=?'),
-            array($model->id)
+            array($model->id),
+            array('order' => 'sorting')
         );
 
         return $collection;