public function emptyWorkspaces()
{
$this->db->delete("users_workspaces_asset", $this->db->quoteInto("userId = ?", $this->model->getId()));
$this->db->delete("users_workspaces_document", $this->db->quoteInto("userId = ?", $this->model->getId()));
$this->db->delete("users_workspaces_object", $this->db->quoteInto("userId = ?", $this->model->getId()));
}