MDL-34794: Add reset course feature in mod_assign (new assignment (2.…

…3+))

mod/assign/lang/en/assign.php

@@ -91,6 +91,7 @@
 $string['defaultplugins'] = 'Default assignment settings';
 $string['defaultplugins_help'] = 'These settings define the defaults for all new assignments.';
 $string['defaultteam'] = 'Default team';
+$string['deleteallsubmissions'] = 'Delete all submissions';
 $string['deletepluginareyousure'] = 'Delete assignment plugin {$a}: are you sure?';
 $string['deletepluginareyousuremessage'] = 'You are about to completely delete the assignment plugin {$a}. This will completely delete everything in the database associated with this assignment plugin. Are you SURE you want to continue?';
 $string['deletingplugin'] = 'Deleting plugin {$a}.';

mod/assign/lib.php

@@ -54,6 +54,72 @@ function assign_delete_instance($id) {
     return $assignment->delete_instance();
 }
 
+/**
+ * This function is used by the reset_course_userdata function in moodlelib.
+ * This function will remove all assignment submissions and feedbacks in the database
+ * and clean up any related data.
+ * @param $data the data submitted from the reset course.
+ * @return array status array
+ */
+function assign_reset_userdata($data) {
+    global $CFG, $DB;
+    require_once($CFG->dirroot . '/mod/assign/locallib.php');
+
+    $status = array();
+    $params = array('courseid'=>$data->courseid);
+    $sql = "SELECT a.id FROM {assign} a WHERE a.course=:courseid";
+    $course = $DB->get_record('course', array('id'=> $data->courseid), '*', MUST_EXIST);
+    if ($assigns = $DB->get_records_sql($sql,$params)) {
+        foreach ($assigns as $assign) {
+            $cm = get_coursemodule_from_instance('assign', $assign->id, $data->courseid, false, MUST_EXIST);
+            $context = context_module::instance($cm->id);
+            $assignment = new assign($context, $cm, $course);
+            $status = array_merge($status, $assignment->reset_userdata($data));
+        }
+    }
+    return $status;
+}
+
+/**
+ * Removes all grades from gradebook
+ *
+ * @param int $courseid The ID of the course to reset
+ * @param string $type Optional type of assignment to limit the reset to a particular assignment type
+ */
+function assign_reset_gradebook($courseid, $type='') {
+    global $CFG, $DB;
+
+    $params = array('moduletype'=>'assign','courseid'=>$courseid);
+    $sql = 'SELECT a.*, cm.idnumber as cmidnumber, a.course as courseid
+            FROM {assign} a, {course_modules} cm, {modules} m
+            WHERE m.name=:moduletype AND m.id=cm.module AND cm.instance=a.id AND a.course=:courseid';
+
+    if ($assignments = $DB->get_records_sql($sql,$params)) {
+        foreach ($assignments as $assignment) {
+            assign_grade_item_update($assignment, 'reset');
+        }
+    }
+}
+
+/**
+ * Implementation of the function for printing the form elements that control
+ * whether the course reset functionality affects the assignment.
+ * @param $mform form passed by reference
+ */
+function assign_reset_course_form_definition(&$mform) {
+    $mform->addElement('header', 'assignheader', get_string('modulenameplural', 'assign'));
+    $mform->addElement('advcheckbox', 'reset_assign_submissions', get_string('deleteallsubmissions','assign'));
+}
+
+/**
+ * Course reset form defaults.
+ * @param  object $course
+ * @return array
+ */
+function assign_reset_course_form_defaults($course) {
+    return array('reset_assign_submissions'=>1);
+}
+
 /**
  * Update an assignment instance
  *

mod/assign/locallib.php

@@ -552,6 +552,82 @@ public function delete_instance() {
         return $result;
     }
 
+    /**
+    * Actual implementation of the reset course functionality, delete all the
+    * assignment submissions for course $data->courseid.
+    *
+    * @param $data the data submitted from the reset course.
+    * @return array status array
+    */
+    public function reset_userdata($data) {
+        global $CFG,$DB;
+
+        $componentstr = get_string('modulenameplural', 'assign');
+        $status = array();
+
+        $fs = get_file_storage();
+        if (!empty($data->reset_assign_submissions)) {
+            // Delete files associated with this assignment.
+            foreach ($this->submissionplugins as $plugin) {
+                $fileareas = array();
+                $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
+                $fileareas = $plugin->get_file_areas();
+                foreach ($fileareas as $filearea) {
+                    $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
+                }
+
+                if (!$plugin->delete_instance()) {
+                    $status[] = array('component'=>$componentstr,
+                                      'item'=>get_string('deleteallsubmissions','assign'),
+                                      'error'=>$plugin->get_error());
+                }
+            }
+
+            foreach ($this->feedbackplugins as $plugin) {
+                $fileareas = array();
+                $plugincomponent = $plugin->get_subtype() . '_' . $plugin->get_type();
+                $fileareas = $plugin->get_file_areas();
+                foreach ($fileareas as $filearea) {
+                    $fs->delete_area_files($this->context->id, $plugincomponent, $filearea);
+                }
+
+                if (!$plugin->delete_instance()) {
+                    $status[] = array('component'=>$componentstr,
+                                      'item'=>get_string('deleteallsubmissions','assign'),
+                                      'error'=>$plugin->get_error());
+                }
+            }
+
+            $assignssql = "SELECT a.id
+                             FROM {assign} a
+                           WHERE a.course=:course";
+            $params = array ("course" => $data->courseid);
+
+            $DB->delete_records_select('assign_submission', "assignment IN ($assignssql)", $params);
+            $status[] = array('component'=>$componentstr,
+                              'item'=>get_string('deleteallsubmissions','assign'),
+                              'error'=>false);
+
+            if (empty($data->reset_gradebook_grades)) {
+                // Remove all grades from gradebook.
+                require_once($CFG->dirroot.'/mod/assign/lib.php');
+                assign_reset_gradebook($data->courseid);
+            }
+        }
+        // Updating dates - shift may be negative too.
+        if ($data->timeshift) {
+            shift_course_mod_dates('assign',
+                                    array('duedate', 'allowsubmissionsfromdate','cutoffdate'),
+                                    $data->timeshift,
+                                    $data->courseid);
+            $status[] = array('component'=>$componentstr,
+                              'item'=>get_string('datechanged'),
+                              'error'=>false);
+        }
+
+        return $status;
+    }
+
     /**
      * Update the settings for a single plugin
      *