Question

我有3个mysql表

**Clients**  
id | name 

**Services**
id | name | foreign key -> client_id

**Payments**  
id | payment_date | amount | foreign key -> service_id

ClientController.php

$sumPayments = Payment::join('services', 'payments.service_id', '=', 'services.id')
        ->join('clients', 'clients.id', '=', 'services.client_id')->get();

Clients / index.blade.php

@foreach($clients as $client)
      <tr>  
@foreach($service->payments as $payment)
          @if($payment->service_id == $service->id)
            <td>{{$sumPayments->where('service_id', '$services->id')->sum('payment_amount')}}</td>
            @break
          @endif
        @endforeach   
  </tr>
@endforeach

属于＆＃39; belongsTo＆＃39;和＆＃39; hasMany＆＃39;在我的模特中。
我尝试显示每个客户支付的总金额。请帮忙。

Answer 1

使用withCount()方法：

Client::withCount('payments')->get();

如果您想要计算关系中的结果数而不实际加载它们，您可以使用withCount方法，这会在您生成的模型上放置{relation}_count列。

因此，此代码将为每个客户端创建一个新的payments_count属性：

@foreach ($clients as $client)
    {{ $client->payments_count }}
@endforeach

Laravel连接多个表格

1 个答案: