From 6b7b7455d1358b4a4880d3fe131ea7e37cffec85 Mon Sep 17 00:00:00 2001
From: Frederic Massart <fred@moodle.com>
Date: Thu, 6 Jun 2013 11:50:58 +0800
Subject: [PATCH] MDL-38314 repository: Delete repository instances on context
 deletion

---
 lib/accesslib.php  |  4 ++++
 repository/lib.php | 26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/lib/accesslib.php b/lib/accesslib.php
index dbb20318e70..6a779e9c6d5 100644
--- a/lib/accesslib.php
+++ b/lib/accesslib.php
@@ -5284,6 +5284,10 @@ abstract class context extends stdClass implements IteratorAggregate {
         $fs = get_file_storage();
         $fs->delete_area_files($this->_id);
 
+        // Delete all repository instances attached to this context.
+        require_once($CFG->dirroot . '/repository/lib.php');
+        repository::delete_all_for_context($this->_id);
+
         // delete all advanced grading data attached to this context
         require_once($CFG->dirroot.'/grade/grading/lib.php');
         grading_manager::delete_all_for_context($this->_id);
diff --git a/repository/lib.php b/repository/lib.php
index 0e28f1c3fa8..137700bee74 100644
--- a/repository/lib.php
+++ b/repository/lib.php
@@ -2077,6 +2077,32 @@ abstract class repository implements cacheable_object {
         return true;
     }
 
+    /**
+     * Delete all the instances associated to a context.
+     *
+     * This method is intended to be a callback when deleting
+     * a course or a user to delete all the instances associated
+     * to their context. The usual way to delete a single instance
+     * is to use {@link self::delete()}.
+     *
+     * @param int $contextid context ID.
+     * @param boolean $downloadcontents true to convert references to hard copies.
+     * @return void
+     */
+    final public static function delete_all_for_context($contextid, $downloadcontents = true) {
+        global $DB;
+        $repoids = $DB->get_fieldset_select('repository_instances', 'id', 'contextid = :contextid', array('contextid' => $contextid));
+        if ($downloadcontents) {
+            foreach ($repoids as $repoid) {
+                $repo = repository::get_repository_by_id($repoid, $contextid);
+                $repo->convert_references_to_local();
+            }
+        }
+        cache::make('core', 'repositories')->purge();
+        $DB->delete_records_list('repository_instances', 'id', $repoids);
+        $DB->delete_records_list('repository_instance_config', 'instanceid', $repoids);
+    }
+
     /**
      * Hide/Show a repository
      *