带有条件的laravel数据透视表

Question

目前我在从数据透视表访问数据时遇到问题。

这是我的设置，我有 3 个模型：

• 用户
• 频道
• 访问（作为枢轴，包含 user_id 和 channel_id）

我使用以下方式设置关系：

public function channels()
    {
        return $this->belongsToMany('App\Models\Channel', 'cms_access', 'user_id', 'channel_id')
                ->withPivot('access_analytic', 'access_live_channel', 'access_linear_channel', 'access_ads', 'access_push_notification')
                ->withTimestamps();
    }

我尝试构建一个页面来显示用户的详细信息以及他/她对表格的访问权限：

public function show($id)
{
    $user = User::findOrFail($id);

    // whereHas seems not working, cannot filter to specific id only
    $channels = Channel::with('users')
                        ->whereHas('users', function ($query) use($user) {
                            $query->where('users.id', '=', $user->id);
                        }) 
                        ->where('company_id', '=', $user->company_id)
                        ->where('active', '=', 1)
                        ->get();

    return view('user.show')
            ->with('user', $user)
            ->with('channels', $channels);
}

当前使用表：

<tbody>
    @forelse ($channels as $channel)
        {!! Form::open(['route' => ['access.store'], 'method' => 'POST']) !!}
        <tr>
            <td>
                <img src="{{ minio_url('channels/'.$channel->logo) }}" alt="{{ $channel->logo }}" class="img-responsive">
            </td>
            <td>{{ $channel->name_eng }}</td>
            <td>
                {!! Form::select('access_analytic', ['none' => 'None', 'read' => 'Read'], @$channel->users[0]->pivot->access_analytic, ['class' =>'form-control']) !!}
            </td>
            <td>
                {!! Form::select('access_live_channel', ['none' => 'None', 'read' => 'Read', 'read/write' => 'Read/Write', 'read/write/delete' => 'Read/Write/Delete'], @$channel->users[0]->pivot->access_live_channel, ['class' =>'form-control']) !!}
            </td>
            <td>
                {!! Form::select('access_linear_channel', ['none' => 'None', 'read' => 'Read', 'read/write' => 'Read/Write', 'read/write/delete' => 'Read/Write/Delete'], @$channel->users[0]->pivot->access_linear_channel, ['class' =>'form-control']) !!}
            </td>
            <td>
                {!! Form::select('access_push_notification', ['none' => 'None', 'read' => 'Read', 'read/write' => 'Read/Write', 'read/write/delete' => 'Read/Write/Delete'], @$channel->users[0]->pivot->access_push_notification, ['class' =>'form-control']) !!}
            </td>
            <td class="text-center">
                {!! Form::hidden('user_id', $user->id) !!}
                {!! Form::hidden('channel_id', $channel->id) !!}
                {!! Form::submit('Save', ['class' =>'btn btn-primary']) !!}
            </td>
        </tr>
        {!! Form::close() !!}
    @empty
        <tr>
            <td colspan="6" class="text-center">No channel available!</td>
        </tr>
    @endforelse
    </tbody>

我不想使用 $channel->users[0]->pivot->access_analytic 等，因为它不能一直工作 由于 whereHas 不工作，有时实际用户位于 users[1]，关于我应该如何访问关系的任何其他建议？

Answer 1

如果您只想让每个频道的一个用户获得同一用户的频道，您需要像这样组合with()和whereHas()：

Channel::with(['users' => function($q) use($user) {
        $q->where('id', $user->id);
    }])
    ->whereHas('users', function ($q) use($user) {
        $q->where('id', $user->id);
    }) 
    ->where('company_id', $user->company_id)
    ->where('active', 1)
    ->get();

在这种情况下，只会加载一个用户。因此，您将能够通过以下方式获取数据透视数据：

$channel->users->first()->pivot->access_analytic

或者：

$channel->users[0]->pivot->access_analytic

如果您不想按用户过滤频道，只需删除 whereHas() 部分。