public function addRolePermission(ChildRolePermission $l)
    {
        if ($this->collRolePermissions === null) {
            $this->initRolePermissions();
            $this->collRolePermissionsPartial = true;
        }

        if (!$this->collRolePermissions->contains($l)) {
            $this->doAddRolePermission($l);
        }

        return $this;
    }