public function table()
 {
     $operations = ['<li><a href="{{route("customer-groups.edit", ["groupId" => $id])}}"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span> Edit</a></li>', '<li><a href="{{route("customer-groups.remove", ["groupId" => $id])}}"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span> Remove</a></li>', '<li><a href="{{route("attendance.index", ["groupId" => $id])}}"><span class="glyphicon glyphicon-list" aria-hidden="true"></span> Attendace</a></li>'];
     $groups = CustomerGroup::select(['customer_group.id', 'customer_group.groupname']);
     return \Datatables::of($groups)->add_column('operations', '<ul class="operations">' . implode($operations) . '</ul>')->add_column('show', '{{route("customers.show", ["customerId" => $id])}}')->remove_column('id')->make(true);
 }