查询多态表和相关表的记录

Question

您好，我有一个活动表，其中包含已发布的回复和线程的记录。我正在尝试查询活动表以访问回复和线程表以进行搜索以返回记录，但我无法理解为什么我的查询不起作用。

这是我所拥有的：

$results = \DB::table('activities')
        ->join('threads', function($builder) use ($search) {
            $builder->on('threads.id', '=', 'activities.activity_id')
            ->where('threads.body', 'LIKE', '%' . $search . '%');

        })
        ->join('replies', function($builder) {
            $builder->on('replies.id', '=', 'activities.activity_id');

        })
        ->where('replies.body', 'LIKE', '%' . $search . '%')
        ->orWhere('threads.title', 'LIKE', '%' . $search . '%')
        ->orWhere('threads.body', 'LIKE', '%' . $search . '%')
        ->get();

谁能帮帮我？

谢谢。

"select * from `activities` inner join `threads` on `threads`.`id` = `activities`.`activity_id` and `activities`.`activity_type` = ? inner join `replies` on `replies`.`id` = `activities`.`activity_id` and `activities`.`activity_type` = ? where `replies`.`body` LIKE ? or `threads`.`title` LIKE ? or `threads`.`body` LIKE ?

Answer 1

在多态关系中你有两列来保存关系信息，在这种情况下必须有'activities.activity_id','activities.activity_type'。

您应该在 join 语句中包含第二列：

 $results = \DB::table('activities')
            ->leftJoin('threads', function($builder) {
                $builder->on('threads.id', '=', 'activities.activity_id')
                ->where('activities.activity_type',Thread::class);

        })
        ->leftJoin('replies', function($builder) {
            $builder->on('replies.id', '=', 'activities.activity_id')
            ->where('activities.activity_type',Reply::class);
        })
        ->where('replies.body', 'LIKE', '%' . $search . '%')
        ->orWhere('threads.title', 'LIKE', '%' . $search . '%')
        ->orWhere('threads.body', 'LIKE', '%' . $search . '%')
        ->get();

你可以这样做：

在您的活动模型中添加以下关系：

  public function thread()
    {
        return $this->belongsTo(Thread::class,'activity_id')
            ->where('activity_type',Thread::class);
    }

public function replay()
{
    return $this->belongsTo(Replay::class,'activity_id')
        ->where('activity_type',Replay::class);
}

现在你可以像这样使用普通的 whereHas 了：

  $results = Activity::with('activityable')->whereHas('thread', function ($query) use ($search) {
            $query->where('threads.body', 'LIKE', '%' . $search . '%')
                ->orWhere('threads.title', 'LIKE', '%' . $search . '%');
        })->orWhereHas('replay', function ($query) use ($search) {
            $query->where('replies.body', 'LIKE', '%' . $search . '%');

        })->get();

请注意，我不确定 Activity 模型中的多态关系名称， 将关系名称“activityable”替换为模型中的实际名称。