Added comment

classes/filter_default.php

@@ -34,8 +34,17 @@
 
 class block_xp_filter_default extends block_xp_filter {
 
- public function load(StdClass $filter) {
- // TODO: check null.
+ /**
+ * Loads filter data from object except courseid and id.
+ *
+ * default filters don't have courseid.
+ * Not having id means that when saved will always create a new record.
+ *
+ * @param stdClass or block_xp_filter $filter
+ */
+ public function load($filter) {
+ // TODO: check nulls.
+ // TODO: validate ruledata to avoid course context.
  $this->ruledata = $filter->ruledata;
  $this->points = $filter->points;
  $this->sortorder = $filter->sortorder;