Laravel - 多个外键和获取 id

Question

我先尝试了很多不同的东西，但似乎没有得到结果。

控制器：

public function all()
{
    $projects = Project::all();

    foreach($projects as $project) {
        $pid = $project->id;
    }

    $am = DB::table('projects')
        ->join('employees', 'projects.am_id', '=', 'employees.id')
        ->where('projects.id', '=', $pid)
        ->select('projects.id', 'projects.am_id', 'employees.name')
        ->first();

    $pm = DB::table('projects')
        ->join('employees', 'projects.pm_id', '=', 'employees.id')
        ->where('projects.id', '=', $pid)
        ->select('projects.id', 'projects.pm_id', 'employees.name')
        ->first();

    return view('projects/all', [
        'projects' => $projects, 'am' => $am, 'pm' => $pm
        ]);
}

查看：

<h1 class="text-center">All Projects</h1>
            @foreach ($projects as $project)
              <div class="row">
              <div class="col-md-6 text-center">
                <h3><a href="">{{ $project->company }}</a></h3>
              </div>
              <div class="col-md-6 text-center">
                <p>Account Manager: {{ $am->name }}</p>
                <p>Project Manager: {{ $pm->name }}</p>
              </div>
              </div>
              <hr>
            @endforeach

所以我想查看每个项目的公司名称和项目经理和客户经理。不过，我看到的是同一个人负责所有项目。它没有为每个项目挑选正确的经理。

我尝试在控制器中执行 for 循环以获取项目 ID 并将其传递到 where 子句中，但这没有用。

有什么解决办法吗？

谢谢！

Answer 1

您对 $am 和 $pm 的查询不在 foreach 循环内。所以你只得到最后一个项目的 $am 和 $pm 值($pid)

public function all()
{
    $projects = Project::all();

    foreach($projects as $project) {
        $pid = $project->id;
        $am = DB::table('projects')
            ->join('employees', 'projects.am_id', '=', 'employees.id')
            ->where('projects.id', '=', $pid)
            ->select('projects.id', 'projects.am_id', 'employees.name')
            ->first();

        $pm = DB::table('projects')
            ->join('employees', 'projects.pm_id', '=', 'employees.id')
            ->where('projects.id', '=', $pid)
            ->select('projects.id', 'projects.pm_id', 'employees.name')
            ->first();
        $project->am = $am;
        $project->pm = $pm;
    }


    return view('projects/all', [
        'projects' => $projects
        ]);
}

查看

<h1 class="text-center">All Projects</h1>
@foreach ($projects as $project)
    <div class="row">
        <div class="col-md-6 text-center">
            <h3><a href="">{{ $project->company }}</a></h3>
        </div>
        <div class="col-md-6 text-center">
            <p>Account Manager: {{ $project->am->name }}</p>
            <p>Project Manager: {{ $project->pm->name }}</p>
        </div>
    </div>
<hr>
@endforeach

Laravel - 多个外键和获取 id

Laravel - Multiple foreign keys and getting id

laravel-5

eloquent

foreign-key-relationship