MDL-28463 grades: inform conditionlib that grades changed

lib/conditionlib.php

@@ -1228,6 +1228,24 @@ abstract class condition_info_base {
         }
     }
 
+    /**
+     * Called by grade code to inform the completion system when a grade has
+     * been changed. Grades can be used to determine condition for
+     * the course-module or section.
+     *
+     * Note that this function may be called twice for one changed grade object.
+     *
+     * @param grade_grade $grade
+     * @param bool $deleted
+     */
+    public static function inform_grade_changed($grade, $deleted) {
+        global $USER, $SESSION;
+        // In case of self-grading we can purge cache immediately.
+        if ($USER->id == $grade->userid) {
+            unset($SESSION->gradescorecache[$grade->itemid]);
+        }
+    }
+
     /**
      * Returns true if a field meets the required conditions, false otherwise.
      *

lib/grade/grade_grade.php

@@ -772,12 +772,7 @@ class grade_grade extends grade_object {
      * @param bool $deleted True if grade was actually deleted
      */
     function notify_changed($deleted) {
-        global $USER, $SESSION, $CFG,$COURSE, $DB;
-
-        // Grades may be cached in user session
-        if ($USER->id == $this->userid) {
-            unset($SESSION->gradescorecache[$this->itemid]);
-        }
+        global $CFG,$COURSE, $DB;
 
         // Ignore during restore
         // TODO There should be a proper way to determine when we are in restore
@@ -787,6 +782,12 @@ class grade_grade extends grade_object {
             return;
         }
 
+        // Inform conditionlib since it may cache the grades for conditional availability of modules or sections.
+        if (!empty($CFG->enableavailability)) {
+            require_once($CFG->libdir.'/conditionlib.php');
+            condition_info_base::inform_grade_changed($this, $deleted);
+        }
+
         require_once($CFG->libdir.'/completionlib.php');
 
         // Bail out immediately if completion is not enabled for site (saves loading