From 7d054079c57bb5ffebf301a96f8e72944ff05d95 Mon Sep 17 00:00:00 2001
From: Damyon Wiese <damyon@moodle.com>
Date: Fri, 1 Feb 2013 13:44:46 +0800
Subject: [PATCH] MDL-37635 Assign: Prevent errors when viewing a feedback when
 there is no grade_item in the gradebook

---
 mod/assign/locallib.php | 57 +++++++++++++++++++++++++++++------------
 mod/assign/renderer.php | 22 ++++++++--------
 2 files changed, 52 insertions(+), 27 deletions(-)

diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index f61aa404ef1..badd017ee8f 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -2180,8 +2180,12 @@ class assign {
                                         $this->get_instance()->id,
                                         $user->id);
 
-            $gradingitem = $gradinginfo->items[0];
-            $gradebookgrade = $gradingitem->grades[$user->id];
+            $gradingitem = null;
+            $gradebookgrade = '-';
+            if (isset($gradinginfo->items[0])) {
+                $gradingitem = $gradinginfo->items[0];
+                $gradebookgrade = $gradingitem->grades[$user->id];
+            }
 
             // check to see if all feedback plugins are empty
             $emptyplugins = true;
@@ -2196,24 +2200,34 @@ class assign {
             }
 
 
-            if (!($gradebookgrade->hidden) && ($gradebookgrade->grade !== null || !$emptyplugins)) {
+            $cangrade = has_capability('mod/assign:grade', $this->get_context());
+            // If there is feedback or a visible grade, show the summary.
+            if ((!empty($gradebookgrade->grade) && ($cangrade || !$gradebookgrade->hidden)) ||
+                    !$emptyplugins) {
 
-                $gradefordisplay = '';
+                $gradefordisplay = null;
+                $gradeddate = null;
+                $grader = null;
                 $gradingmanager = get_grading_manager($this->get_context(), 'mod_assign', 'submissions');
 
-                if ($controller = $gradingmanager->get_active_controller()) {
-                    $controller->set_grade_range(make_grades_menu($this->get_instance()->grade));
-                    $gradefordisplay = $controller->render_grade($PAGE,
-                                                                 $grade->id,
-                                                                 $gradingitem,
-                                                                 $gradebookgrade->str_long_grade,
-                                                                 has_capability('mod/assign:grade', $this->get_context()));
-                } else {
-                    $gradefordisplay = $this->display_grade($gradebookgrade->grade, false);
+                // Only show the grade if it is not hidden in gradebook.
+                if (!empty($gradebookgrade->grade) && ($cangrade || !$gradebookgrade->hidden)) {
+                    if ($controller = $gradingmanager->get_active_controller()) {
+                        $controller->set_grade_range(make_grades_menu($this->get_instance()->grade));
+                        $gradefordisplay = $controller->render_grade($PAGE,
+                                                                     $grade->id,
+                                                                     $gradingitem,
+                                                                     $gradebookgrade->str_long_grade,
+                                                                     $cangrade);
+                    } else {
+                        $gradefordisplay = $this->display_grade($gradebookgrade->grade, false);
+                    }
+                    $gradeddate = $gradebookgrade->dategraded;
+                    if (isset($grade->grader)) {
+                        $grader = $DB->get_record('user', array('id'=>$grade->grader));
+                    }
                 }
 
-                $gradeddate = $gradebookgrade->dategraded;
-                $grader = $DB->get_record('user', array('id'=>$grade->grader));
 
                 $feedbackstatus = new assign_feedback_status($gradefordisplay,
                                                       $gradeddate,
@@ -3093,11 +3107,20 @@ class assign {
         }
 
         if (has_all_capabilities(array('gradereport/grader:view', 'moodle/grade:viewall'), $this->get_course_context())) {
+            $usergrade = '-';
+            if (isset($gradinginfo->items[0]->grades[$userid]->str_grade)) {
+                $usergrade = $gradinginfo->items[0]->grades[$userid]->str_grade;
+            }
             $gradestring = $this->output->action_link(new moodle_url('/grade/report/grader/index.php',
                                                               array('id'=>$this->get_course()->id)),
-                                                $gradinginfo->items[0]->grades[$userid]->str_grade);
+                                                      $usergrade);
         } else {
-            $gradestring = $gradinginfo->items[0]->grades[$userid]->str_grade;
+            $usergrade = '-';
+            if (isset($gradinginfo->items[0]->grades[$userid]) &&
+                    !$grading_info->items[0]->grades[$userid]->hidden) {
+                $usergrade = $gradinginfo->items[0]->grades[$userid]->str_grade;
+            }
+            $gradestring = $usergrade;
         }
         $mform->addElement('static', 'finalgrade', get_string('currentgrade', 'assign').':', $gradestring);
 
diff --git a/mod/assign/renderer.php b/mod/assign/renderer.php
index 107eae885ae..4af7b1f2ffc 100644
--- a/mod/assign/renderer.php
+++ b/mod/assign/renderer.php
@@ -303,17 +303,19 @@ class mod_assign_renderer extends plugin_renderer_base {
         $o .= $this->output->box_start('boxaligncenter feedbacktable');
         $t = new html_table();
 
-        $row = new html_table_row();
-        $cell1 = new html_table_cell(get_string('grade'));
-        $cell2 = new html_table_cell($status->gradefordisplay);
-        $row->cells = array($cell1, $cell2);
-        $t->data[] = $row;
+        if (isset($status->gradefordisplay)) {
+            $row = new html_table_row();
+            $cell1 = new html_table_cell(get_string('grade'));
+            $cell2 = new html_table_cell($status->gradefordisplay);
+            $row->cells = array($cell1, $cell2);
+            $t->data[] = $row;
 
-        $row = new html_table_row();
-        $cell1 = new html_table_cell(get_string('gradedon', 'assign'));
-        $cell2 = new html_table_cell(userdate($status->gradeddate));
-        $row->cells = array($cell1, $cell2);
-        $t->data[] = $row;
+            $row = new html_table_row();
+            $cell1 = new html_table_cell(get_string('gradedon', 'assign'));
+            $cell2 = new html_table_cell(userdate($status->gradeddate));
+            $row->cells = array($cell1, $cell2);
+            $t->data[] = $row;
+        }
 
         if ($status->grader) {
             $row = new html_table_row();
-- 
2.17.1