/**
  * Delete specific project group
  *
  * @param void
  * @return null
  */
 function delete()
 {
     if ($this->active_project_group->isNew()) {
         $this->httpError(HTTP_ERR_NOT_FOUND);
     }
     // if
     if (!$this->active_project_group->canDelete($this->logged_user)) {
         $this->httpError(HTTP_ERR_FORBIDDEN);
     }
     // if
     if ($this->request->isSubmitted()) {
         $delete = $this->active_project_group->delete();
         if ($delete && !is_error($delete)) {
             if ($this->request->getFormat() == FORMAT_HTML) {
                 flash_success("Project group ':name' has been deleted", array('name' => $this->active_project_group->getName()));
                 $this->redirectTo('project_groups');
             } else {
                 $this->httpOk();
             }
             // if
         } else {
             if ($this->request->getFormat() == FORMAT_HTML) {
                 flash_error("Failed to delete ':name' group. Reason: :reason", array('name' => $this->active_project_group->getName(), 'reason' => $delete->getMessage()));
                 $this->redirectTo('project_groups');
             } else {
                 $this->serveData($delete);
             }
             // if
         }
         // if
     } else {
         $this->httpError(HTTP_ERR_BAD_REQUEST);
     }
     // if
 }