从叶片到控制器的laravel变量

我正试图将一个对象从我的索引页传递给一个函数，并试图在服务器+域之间进行区分，我可以在索引页上通过获取类名来实现这一点，但传递给我的函数的变量只是id，所以我看不出对象是服务器还是域，

如果我尝试这样做，它会将整个对象作为变量（$invoice）发送：

        {!! Form::open(array('class' => 'form-inline', 'method' => 'POST', 'action' => array('InvoiceController@bill', domains.'/'.$invoice))) !!}

控制器

public function index() {
    $expiry = date('Y-m-d', strtotime('+3 months'));
    $servers = Server::where('expiry_date', '<', $expiry)->orderBy('expiry_date', 'asc')->get();
    $domains = Domain::where('expiry_date', '<', $expiry)->orderBy('expiry_date', 'asc')->get();
    $invoices = $domains->merge($servers);
    return view('invoices.index', compact('servers'))->with(compact('domains'))->with(compact('invoices'));
}

表单

 <tbody>
            @foreach($invoices as $invoice)
            <?php $reflect = new 'ReflectionClass($invoice); ?>
            {!! Form::open(array('class' => 'form-inline', 'method' => 'POST', 'action' => array('InvoiceController@bill', $invoice))) !!}
            <tr>
                @if ($reflect->getShortName() == 'Domain')
                <td><a href="{{ route('domains.show', $invoice->id) }}">{{ $invoice->id }}</a></td>
                @endif
                @if ($reflect->getShortName() == 'Server')
                <td><a href="{{ route('servers.show', $invoice->id) }}">{{ $invoice->id }}</a></td>
                @endif
                <td>{{ $invoice->name }}</td>
                <td>{{ $invoice->expiry_date }}</td>
                <td>{{ $reflect->getShortName() }}</td>
                <td>{{ $invoice->ClientName }}</td>
                <td>
                    @if ($reflect->getShortName() == 'Domain')
                    {!! link_to_route('domains.edit', 'Edit', array($invoice->id), array('class' => 'btn btn-info')) !!}
                    @endif
                    @if ($reflect->getShortName() == 'Server')
                    {!! link_to_route('servers.edit', 'Edit', array($invoice->id), array('class' => 'btn btn-info')) !!}
                    @endif
                    {!! Form::submit('Bill', array('class' => 'btn btn-danger')) !!} </td>
            </tr>
            {!! Form::close() !!}
            @endforeach
        </tbody>

控制器

public function bill($invoice) {

    $invoice = Domain::whereId($invoice)->first();
    $bill = new BilltoKashflow();
    $bill->bill($invoice);
}