Laravel检查集合是否为空 [英] Laravel check if collection is empty

问题描述

我已经在Laravel网络应用程序中找到了它:

I've got this in my Laravel webapp:

@foreach($mentors as $mentor)
    @foreach($mentor->intern as $intern)
        <tr class="table-row-link" data-href="/werknemer/{!! $intern->employee->EmployeeId !!}">
            <td>{{ $intern->employee->FirstName }}</td>
            <td>{{  $intern->employee->LastName }}</td>
        </tr>
    @endforeach
@endforeach

我如何检查是否有$mentors->intern->employee?

当我这样做时:

@if(count($mentors))

它不会检查.

推荐答案

您始终可以对集合进行计数.例如，$mentor->intern->count()将返回导师的实习生人数.

You can always count the collection. For example $mentor->intern->count() will return how many intern does a mentor have.

https://laravel.com/docs/5.2/collections#method-count

在您的代码中，您可以执行以下操作

In your code you can do something like this

foreach($mentors as $mentor)
    @if($mentor->intern->count() > 0)
    @foreach($mentor->intern as $intern)
        <tr class="table-row-link" data-href="/werknemer/{!! $intern->employee->EmployeeId !!}">
            <td>{{ $intern->employee->FirstName }}</td>
            <td>{{  $intern->employee->LastName }}</td>
        </tr>
    @endforeach
    @else
        Mentor don't have any intern
    @endif
@endforeach

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