如何在Laravel的数据透视表上应用过滤器？

Question

我有以下关系的三个模型

模型1：RecringSchedule

protected $recording_schedule = 'recording_schedules';

// relationship with processes
public function processes()
{
        return $this->belongsToMany('Process', 'recording_uploads', 'recording_schedule_id', 'process_id');
}

模型2：流程

protected $table = 'processes';
// relationship with recordings
public function recordings()
{
    return $this->belongsToMany('RecordingSchedule', 'recording_uploads');
}

模型3：RecordingUpload

protected $table = 'recording_uploads';

这里的model3是数据透视表，其中包含id，recording_schedule_id，process_id，created_at，updated_at

我有一个疑问，

$recordings = RecordingSchedule::with('processes')->orderBy('recording_date_time', 'desc')->paginate(50)->toArray()

上面的查询是返回所有带有过程的录音。 现在如何通过数据透视表中的process_id应用过滤器？ 像哪里process_id = 3

我已经尝试过Kousha回答

它正在显示

[id] => 35
        [dialin_number] => 9908154124
        [operator_extension] => 121
        [recording_id] => 08631a03109
        [max_duration] => 10
        [recording_date_time] => 2014-07-31 13:06:00
        [status] => ADDED
        [created_by] => 32
        [created_at] => 2014-07-31 12:06:48
        [updated_at] => 2014-07-31 12:14:04
        [processes] => Array
            (
                [0] => Array
                    (
                        [id] => 3
                        [name] => basic
                        [created_at] => 2014-07-10 12:22:06
                        [updated_at] => 2014-07-16 14:06:35
                        [pivot] => Array
                            (
                                [recording_schedule_id] => 35
                                [process_id] => 3
                            )

                    )

            )

以及以下其他录音

[id] => 39
        [dialin_number] => 939938333
        [operator_extension] => 141
        [recording_id] => 123456#
        [max_duration] => 30
        [recording_date_time] => 2014-07-31 12:19:00
        [status] => ADDED
        [created_by] => 32
        [created_at] => 2014-07-31 13:20:16
        [updated_at] => 2014-07-31 13:20:34
        [processes] => Array
            (
            )

    )

在第二个数组中，显示具有空进程的记录。 实际上，该记录属于进程ID6。我不希望其他记录具有其他进程ID。

提前致谢

Answer 1

您无需将过滤器应用于数据透视表，而是应用于表格processes ：

$process_id = 3;

$recordings = RecodingsSchedule::with([
    'processes' => function($query) use ($process_id)
    {
        $query->whereId($process_id);
    }
])->orderBy('recording_date_time', 'desc')->paginate(50)->toArray();