public function addUserRole(ChildUserRole $l)
    {
        if ($this->collUserRoles === null) {
            $this->initUserRoles();
            $this->collUserRolesPartial = true;
        }

        if (!$this->collUserRoles->contains($l)) {
            $this->doAddUserRole($l);
        }

        return $this;
    }