MDL-57273 core: Exporters support custom formatting parameters

admin/tool/lp/classes/external/path_node_exporter.php

@@ -24,6 +24,7 @@
 namespace tool_lp\external;
 defined('MOODLE_INTERNAL') || die();
 
+use context_system;
 
 /**
  * Class for exporting path_node data.
@@ -33,6 +34,34 @@ defined('MOODLE_INTERNAL') || die();
  */
 class path_node_exporter extends \core\external\exporter {
 
+    /**
+     * Constructor - saves the persistent object, and the related objects.
+     *
+     * @param mixed $data The data.
+     * @param array $related Array of relateds.
+     */
+    public function __construct($data, $related = array()) {
+        if (!isset($related['context'])) {
+            // Previous code was automatically using the system context which was not always correct.
+            // We let developers know that they must fix their code without breaking anything,
+            // and fallback on the previous behaviour. This should be removed at a later stage: Moodle 3.5.
+            debugging('Missing related context in path_node_exporter.', DEBUG_DEVELOPER);
+            $related['context'] = context_system::instance();
+        }
+        parent::__construct($data, $related);
+    }
+
+    /**
+     * Return the list of properties.
+     *
+     * @return array
+     */
+    protected static function define_related() {
+        return [
+            'context' => 'context'
+        ];
+    }
+
     /**
      * Return the list of properties.
      *