Create a default forum when creating a group

htdocs/interaction/forum/db/upgrade.php

@@ -87,6 +87,11 @@ function xmldb_interaction_forum_upgrade($oldversion=0) {
         }
     }
 
+    if ($oldversion < 2009081800) {
+        $subscription = (object) array('plugin' => 'forum', 'event' => 'creategroup', 'callfunction' => 'create_default_forum');
+        ensure_record_exists('interaction_event_subscription', $subscription, $subscription);
+    }
+
     return true;
 }
 

htdocs/interaction/forum/lang/en.utf8/interaction.forum.php

@@ -52,6 +52,8 @@ $string['closeddescription'] = 'Closed topics can only be replied to by moderato
 $string['Count'] = 'Count';
 $string['createtopicusersdescription'] = 'If set to "All group members", anyone can create new topics and reply to existing topics.  If set to "Moderators and group admins", only moderators and group administrators can start new topics, but once topics exist, all users can post replies to them.';
 $string['currentmoderators'] = 'Current Moderators';
+$string['defaultforumtitle'] = 'General Discussion';
+$string['defaultforumdescription'] = '%s general discussion forum';
 $string['deleteforum'] = 'Delete forum';
 $string['deletepost'] = 'Delete post';
 $string['deletepostsuccess'] = 'Post deleted successfully';

htdocs/interaction/forum/lib.php

@@ -161,14 +161,16 @@ class PluginInteractionForum extends PluginInteraction {
             'interaction_forum_moderator',
             'forum', $instance->get('id')
         );
-        foreach ($values['moderator'] as $user) {
-            insert_record(
-                'interaction_forum_moderator',
-                (object)array(
-                    'user' => $user,
-                    'forum' => $instance->get('id')
-                )
-            );
+        if (isset($values['moderator']) && is_array($values['moderator'])) {
+            foreach ($values['moderator'] as $user) {
+                insert_record(
+                    'interaction_forum_moderator',
+                    (object)array(
+                        'user' => $user,
+                        'forum' => $instance->get('id')
+                    )
+                );
+            }
         }
 
         // Re-order the forums according to their new ordering
@@ -256,6 +258,11 @@ class PluginInteractionForum extends PluginInteraction {
                 'event'        => 'userjoinsgroup',
                 'callfunction' => 'user_joined_group',
             ),
+            (object)array(
+                'plugin'       => 'forum',
+                'event'        => 'creategroup',
+                'callfunction' => 'create_default_forum',
+            ),
         );
     }
 
@@ -288,6 +295,41 @@ class PluginInteractionForum extends PluginInteraction {
         }
     }
 
+    /**
+     * When a group is created, create one forum automatically.
+     *
+     * @param array $eventdata
+     */
+    public static function create_default_forum($event, $eventdata) {
+        global $USER;
+        $creator = 0;
+        if (isset($eventdata['members'][$USER->get('id')])) {
+            $creator = $USER->get('id');
+        }
+        else {
+            foreach($eventdata['members'] as $userid => $role) {
+                if ($role == 'admin') {
+                    $creator = $userid;
+                    break;
+                }
+            }
+        }
+        db_begin();
+        $forum = new InteractionForumInstance(0, (object) array(
+            'group'       => $eventdata['id'],
+            'creator'     => $creator,
+            'title'       => get_string('defaultforumtitle', 'interaction.forum'),
+            'description' => get_string('defaultforumdescription', 'interaction.forum', $eventdata['name']),
+        ));
+        $forum->commit();
+        self::instance_config_save($forum, array(
+            'createtopicusers' => 'members',
+            'autosubscribe'    => 1,
+            'justcreated'      => 1,
+        ));
+        db_commit();
+    }
+
     /**
      * Optional method. Takes a list of forums and sorts them according to 
      * their weights for the sideblock

htdocs/interaction/forum/version.php

@@ -24,7 +24,7 @@
  *
  */
 
-$config->version = 2009081700;
+$config->version = 2009081800;
 $config->release = '1.2.0';
 
 ?>