MDL-53292 core: deprecate callback delete_course

course/format/README.txt

@@ -139,8 +139,3 @@ Optional file (styles)
 
   If this file exists it will be included in the CSS Moodle generates.
 
-
-Optional delete course hook
----------------------------
-
-* in your yourformat/lib.php add function format_yourformat_delete_course($courseid)
\ No newline at end of file

course/format/upgrade.txt

@@ -2,6 +2,9 @@ This files describes API changes for course formats
 
 Overview of this plugin type at http://docs.moodle.org/dev/Course_formats
 
+=== 3.2 ===
+* Callback delete_course is deprecated and should be replaced with observer for event \core\event\course_content_deleted
+
 === 3.1 ===
 * Course format may use the inplace_editable template to allow quick editing of section names, see
   https://docs.moodle.org/dev/Inplace_editable and MDL-51802 for example implementation.

lib/moodlelib.php

@@ -4798,6 +4798,9 @@ function remove_course_contents($courseid, $showfeedback = true, array $options
         echo $OUTPUT->notification($strdeleted.get_string('type_block_plural', 'plugin'), 'notifysuccess');
     }
 
+    // Get the list of all modules that are properly installed.
+    $allmodules = $DB->get_records_menu('modules', array(), '', 'name, id');
+
     // Delete every instance of every module,
     // this has to be done before deleting of course level stuff.
     $locations = core_component::get_plugin_list('mod');
@@ -4805,30 +4808,36 @@ function remove_course_contents($courseid, $showfeedback = true, array $options
         if ($modname === 'NEWMODULE') {
             continue;
         }
-        if ($module = $DB->get_record('modules', array('name' => $modname))) {
+        if (array_key_exists($modname, $allmodules)) {
+            $sql = "SELECT cm.*, m.id AS modinstance, m.name, '$modname' AS modname
+              FROM {".$modname."} m
+                   LEFT JOIN {course_modules} cm ON cm.instance = m.id AND cm.module = :moduleid
+             WHERE m.course = :courseid";
+            $instances = $DB->get_records_sql($sql, array('courseid' => $course->id,
+                'modulename' => $modname, 'moduleid' => $allmodules[$modname]));
+
             include_once("$moddir/lib.php");                 // Shows php warning only if plugin defective.
             $moddelete = $modname .'_delete_instance';       // Delete everything connected to an instance.
             $moddeletecourse = $modname .'_delete_course';   // Delete other stray stuff (uncommon).
 
-            if ($instances = $DB->get_records($modname, array('course' => $course->id))) {
-                foreach ($instances as $instance) {
-                    if ($cm = get_coursemodule_from_instance($modname, $instance->id, $course->id)) {
+            if ($instances) {
+                foreach ($instances as $cm) {
+                    if ($cm->id) {
                         // Delete activity context questions and question categories.
                         question_delete_activity($cm,  $showfeedback);
-
                         // Notify the competency subsystem.
                         \core_competency\api::hook_course_module_deleted($cm);
                     }
                     if (function_exists($moddelete)) {
                         // This purges all module data in related tables, extra user prefs, settings, etc.
-                        $moddelete($instance->id);
+                        $moddelete($cm->modinstance);
                     } else {
                         // NOTE: we should not allow installation of modules with missing delete support!
                         debugging("Defective module '$modname' detected when deleting course contents: missing function $moddelete()!");
-                        $DB->delete_records($modname, array('id' => $instance->id));
+                        $DB->delete_records($modname, array('id' => $cm->modinstance));
                     }
 
-                    if ($cm) {
+                    if ($cm->id) {
                         // Delete cm and its context - orphaned contexts are purged in cron in case of any race condition.
                         context_helper::delete_instance(CONTEXT_MODULE, $cm->id);
                         $DB->delete_records('course_modules', array('id' => $cm->id));
@@ -4836,7 +4845,9 @@ function remove_course_contents($courseid, $showfeedback = true, array $options
                 }
             }
             if (function_exists($moddeletecourse)) {
-                // Execute ptional course cleanup callback.
+                // Execute optional course cleanup callback. Deprecated since Moodle 3.2. TODO MDL-53297 remove in 3.6.
+                debugging("Callback delete_course is deprecated. Function $moddeletecourse should be converted " .
+                    'to observer of event \core\event\course_content_deleted', DEBUG_DEVELOPER);
                 $moddeletecourse($course, $showfeedback);
             }
             if ($instances and $showfeedback) {
@@ -4856,12 +4867,13 @@ function remove_course_contents($courseid, $showfeedback = true, array $options
            'coursemoduleid IN (SELECT id from {course_modules} WHERE course=?)',
            array($courseid));
 
-    // Remove course-module data.
+    // Remove course-module data that has not been removed in modules' _delete_instance callbacks.
     $cms = $DB->get_records('course_modules', array('course' => $course->id));
+    $allmodulesbyid = array_flip($allmodules);
     foreach ($cms as $cm) {
-        if ($module = $DB->get_record('modules', array('id' => $cm->module))) {
+        if (array_key_exists($cm->module, $allmodulesbyid)) {
             try {
-                $DB->delete_records($module->name, array('id' => $cm->instance));
+                $DB->delete_records($allmodulesbyid[$cm->module], array('id' => $cm->instance));
             } catch (Exception $e) {
                 // Ignore weird or missing table problems.
             }
@@ -4874,17 +4886,19 @@ function remove_course_contents($courseid, $showfeedback = true, array $options
         echo $OUTPUT->notification($strdeleted.get_string('type_mod_plural', 'plugin'), 'notifysuccess');
     }
 
-    // Cleanup the rest of plugins.
+    // Cleanup the rest of plugins. Deprecated since Moodle 3.2. TODO MDL-53297 remove in 3.6.
     $cleanuplugintypes = array('report', 'coursereport', 'format');
     $callbacks = get_plugins_with_function('delete_course', 'lib.php');
     foreach ($cleanuplugintypes as $type) {
         if (!empty($callbacks[$type])) {
             foreach ($callbacks[$type] as $pluginfunction) {
+                debugging("Callback delete_course is deprecated. Function $pluginfunction should be converted " .
+                    'to observer of event \core\event\course_content_deleted', DEBUG_DEVELOPER);
                 $pluginfunction($course->id, $showfeedback);
             }
-        }
-        if ($showfeedback) {
-            echo $OUTPUT->notification($strdeleted.get_string('type_'.$type.'_plural', 'plugin'), 'notifysuccess');
+            if ($showfeedback) {
+                echo $OUTPUT->notification($strdeleted.get_string('type_'.$type.'_plural', 'plugin'), 'notifysuccess');
+            }
         }
     }
 

mod/feedback/classes/observer.php

+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Event observers supported by this module
+ *
+ * @package    mod_feedback
+ * @copyright  2016 Marina Glancy
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Event observers supported by this module
+ *
+ * @package    mod_feedback
+ * @copyright  2016 Marina Glancy
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_feedback_observer {
+
+    /**
+     * Observer for the even course_content_deleted - delete all course templates.
+     *
+     * @param \core\event\course_content_deleted $event
+     */
+    public static function course_content_deleted(\core\event\course_content_deleted $event) {
+        global $DB;
+        // Delete all templates of given course.
+        $DB->delete_records('feedback_template', array('course' => $event->objectid));
+    }
+}

mod/feedback/db/events.php

+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Feedback event handler definition.
+ *
+ * @package mod_feedback
+ * @category event
+ * @copyright 2016 Marina Glancy
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+// List of observers.
+$observers = array(
+
+    array(
+        'eventname'   => '\core\event\course_content_deleted',
+        'callback'    => 'mod_feedback_observer::course_content_deleted',
+    ),
+
+);

mod/feedback/lib.php

@@ -312,21 +312,6 @@ function feedback_delete_instance($id) {
     return $DB->delete_records("feedback", array("id"=>$id));
 }
 
-/**
- * this is called after deleting all instances if the course will be deleted.
- * only templates have to be deleted
- *
- * @global object
- * @param object $course
- * @return boolean
- */
-function feedback_delete_course($course) {
-    global $DB;
-
-    //delete all templates of given course
-    return $DB->delete_records('feedback_template', array('course'=>$course->id));
-}
-
 /**
  * Return a small object with summary information about what a
  * user has done with a given particular instance of this module

mod/feedback/tests/events_test.php

@@ -329,5 +329,18 @@ class mod_feedback_events_testcase extends advanced_testcase {
             $this->assertContains("The 'anonymous' value must be set in other.", $e->getMessage());
         }
     }
+
+    /**
+     * Test that event observer is executed on course deletion and the templates are removed.
+     */
+    public function test_delete_course() {
+        global $DB;
+        $this->resetAfterTest();
+        feedback_save_as_template($this->eventfeedback, 'my template', 0);
+        $courseid = $this->eventcourse->id;
+        $this->assertNotEmpty($DB->get_records('feedback_template', array('course' => $courseid)));
+        delete_course($this->eventcourse, false);
+        $this->assertEmpty($DB->get_records('feedback_template', array('course' => $courseid)));
+    }
 }
 

mod/feedback/version.php

@@ -24,7 +24,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2016052300;       // The current module version (Date: YYYYMMDDXX)
+$plugin->version   = 2016061300;       // The current module version (Date: YYYYMMDDXX)
 $plugin->requires  = 2016051900;    // Requires this Moodle version
 $plugin->component = 'mod_feedback';   // Full name of the plugin (used for diagnostics)
 $plugin->cron      = 0;

mod/lesson/lib.php

@@ -274,19 +274,6 @@ function lesson_delete_instance($id) {
     return $lesson->delete();
 }
 
-/**
- * Given a course object, this function will clean up anything that
- * would be leftover after all the instances were deleted
- *
- * @global object
- * @param object $course an object representing the course that is being deleted
- * @param boolean $feedback to specify if the process must output a summary of its work
- * @return boolean
- */
-function lesson_delete_course($course, $feedback=true) {
-    return true;
-}
-
 /**
  * Return a small object with summary information about what a
  * user has done with a given particular instance of this module

mod/upgrade.txt

 This files describes API changes in /mod/* - activity modules,
 information provided here is intended especially for developers.
 
+=== 3.2 ===
+
+* Callback delete_course is deprecated and should be replaced with observer for event \core\event\course_content_deleted
+
 === 3.1 ===
 
 * Old /mod/MODULENAME/pix/icon.gif and enrol/paypal/pix/icon.gif GIF icons have been removed. Please use pix_icon

report/upgrade.txt

 This files describes API changes in /report/* - plugins,
 information provided here is intended especially for developers.
 
+=== 3.2 ===
+* Callback delete_course is deprecated and should be replaced with observer for event \core\event\course_content_deleted
+
 === 2.7 ===
 * How to migrate reports accessing table 'log':
   http://docs.moodle.org/dev/Migrating_log_access_in_reports