Question

我有一个项目列表，我可以点击它，它（需要）显示项目名称和项目任务列表（ToDo应用程序）

但是当我点击某个项目时，我收到了这个错误。

（“H2”项目名称将显示）

h2>{{{ $project->name }}}</h2>

@if ( !$project->tasks->count())
    There are no tasks for this project.
@else
    <ul>
        @foreach( $project->tasks as $task)
            <li><a href="{{ route('projects.tasks.show', [$project->slug, $task->slug]) }}">{{ $task->name }}</a></li>
        @endforeach
    </ul>
@endif

Answer 1

$project->tasks是一个数组，你不能在数组上调用count()。所以试试 -

count($project->tasks)

Answer 2

尝试计数（$ project-＆gt; tasks）== 0

h2>{{{ $project->name }}}</h2>

@if ( count($project->tasks)==0)
    There are no tasks for this project.
@else
    <ul>
        @foreach( $project->tasks as $task)
            <li><a href="{{ route('projects.tasks.show', [$project->slug, $task->slug]) }}">{{ $task->name }}</a></li>
        @endforeach
    </ul>
@endif

Answer 3

我看到您的问题已解决，但这可能会对其他人有所帮助：D

以下代码段可能对您有用，但这并不是我们不能在数组上调用count（）。

count($project->tasks)

代替这个

h2>{{{ $project->name }}}</h2>

@if ( !$project->tasks->count()) // tasks is plural -> wrong.
    There are no tasks for this project.
@else
    <ul>
        @foreach( $project->tasks as $task) // here too!
            <li><a href="{{ route('projects.tasks.show', [$project->slug, $task->slug]) }}">{{ $task->name }}</a></li>
        @endforeach
    </ul>
@endif

尝试这样做

h2>{{{ $project->name }}}</h2>

@if ( !$project->task->count())
    There are no tasks for this project.
@else
    <ul>
        @foreach( $project->task as $task)
            <li><a href="{{ route('projects.tasks.show', [$project->slug, $task->slug]) }}">{{ $task->name }}</a></li>
        @endforeach
    </ul>
@endif

调用非对象上的成员函数count（）（Laravel 5）

3 个答案: