Question

我对Laravel 5和MVC框架一般都很陌生。我无法从数据库查询中获取结果并将其传递到我的刀片视图。以下是我对控制器功能的了解......

public function show(Project $project)
{
$technologies = DB::select('select * from technologies where id = ?', [$project->technology_id]);
return view('projects.show', compact('project','technologies'));
}

我认为......

@section('content')
   <h2>{{ $project->name }}</h2>

    @if ( !technologies() )
        no technologies.
    @else
        <ul>
            @foreach( $technologies as $technology )
                <li><a href="#">{{ $technology->slug }}</a></li>
            @endforeach
        </ul>
    @endif
@endsection

感谢您的帮助

Answer 1

<强>控制器

public function show(Project $project)
{
    $technologies = DB::table('technologies')
        ->select('*')
        ->where('id', $project->technology_id)
        ->get(); // you were missing the get method

    return view('projects.show', compact('project', 'technologies'));
}

查看

这在您的视图中无效：@if ( !technologies() )

@section('content') <h2>{{ $project->name }}</h2> @if($technologies) <ul> @foreach($technologies as $technology) <li><a href="#">{{ $technology->slug }}</a></li> @endforeach </ul> @else <p>no technologies.</p> @endif @stop

此外，如果您对以更简洁的方式循环访问数据或使用刀片显示“无数据”警告感兴趣，请查看本文使用的是@each https://laravel-news.com/2014/09/laravel-blade/

Answer 2

将您的查询重写为，

$technologies = DB::table('technologies')->where('id',$project->technology_id)->get();

Laravel 5将数据库查询从控制器传递到视图

2 个答案: