Laravel Eloquent 在与其他表连接后从关系中选择字段

Question

我有一个查询，我已将多个表连接在一起，并且由于它们具有相同名称的字段，因此我使用 select 查询仅挑选出我需要的字段。但是，我还需要包含从 with 查询获得的结果，但我不知道如何在 select 查询中指定它。

        $display_tickets = ManualTicket::select('u.name as name', 'i.name as initiator', 'manual_tickets.status as status', 'manual_tickets.description as description', 'manual_tickets.location as location', 'manual_tickets.created_at as created_at', 'manual_tickets.initiator_id as initiator_id', 'manual_tickets.id as manual_ticket_id','manual_tickets.manual_ticket_log as manual_ticket_log_id')
            ->leftJoin('users as u', 'u.id', '=', 'manual_tickets.user_id')
            ->leftJoin('users as i', 'i.id', '=', 'manual_tickets.initiator_id')
            ->where(function ($checkClients) use($target_client_id){
                $checkClients->where('u.client_id', '=', $target_client_id)
                    ->orWhere('i.client_id', '=', $target_client_id);
            })
            ->whereBetween('manual_tickets.created_at', [$start_date->toDateString(), $end_date->addDays(1)->toDateString()])
            ->with('manual_ticket_log')
            ->orderBy("created_at", "DESC")->get();

我试图通过使用下面的代码来包含手动工单日志，但它说手动工单表中没有这样的字段。

'manual_tickets.manual_ticket_log as manual_ticket_log_id')

简而言之，如何将 ->with('manual_ticket_log') 中的 with 关系的结果包含到 select 语句中

--EDIT-- （尝试用查询替换联接）

但是，我的 SQL 查询似乎有任何错误，我认为这源于导致显示此错误的代码的 whereHas 部分。

strtolower() 期望参数 1 是字符串，给定对象

 $display_tickets = ManualTicket::select('*')
                ->with('user')
                ->with('initiator')
                ->with('manual_ticket_log')
                ->where(function ($checkClients) use($target_client_id){
                    $checkClients->whereHas('user', function ($checkClient) use($target_client_id){
                        $checkClient->where('client_id', '=', $target_client_id);
                    })
                    ->orWhere($checkClients->whereHas('initiator', function ($checkClient2) use($target_client_id){
                        $checkClient2->where('client_id', '=', $target_client_id);
                    }));
                })
                ->whereBetween('manual_tickets.created_at', [$start_date->toDateString(), $end_date->addDays(1)->toDateString()])
                ->orderBy("created_at", "DESC")->get();

Answer 1

您应该加入该表以获取字段形式：

   $display_tickets = ManualTicket::select('u.name as name', 'i.name as initiator', 'manual_tickets.status as status', 'manual_tickets.description as description', 'manual_tickets.location as location', 'manual_tickets.created_at as created_at', 'manual_tickets.initiator_id as initiator_id', 'manual_tickets.id as manual_ticket_id','manual_tickets.manual_ticket_log as manual_ticket_log_id',
            'manual_tickets.manual_ticket_log as manual_ticket_log_id')
            ->leftJoin('users as u', 'u.id', '=', 'manual_tickets.user_id')
            ->leftJoin('users as i', 'i.id', '=', 'manual_tickets.initiator_id')
            ->leftJoin('manual_ticket_logs',function ($join){
            $join->on('manual_ticket_logs.manual_ticket_id', '=', 'manual_tickets.id')
                ->on('manual_ticket_logs.id', '=', \DB::raw("(select max(id) from manual_ticket_logs WHERE manual_ticket_logs.manual_ticket_id = manual_tickets.id)"));
            })
            ->where(function ($checkClients) use($target_client_id){
                $checkClients->where('u.client_id', '=', $target_client_id)
                    ->orWhere('i.client_id', '=', $target_client_id);
            })
            ->whereBetween('manual_tickets.created_at', [$start_date->toDateString(), $end_date->addDays(1)->toDateString()])
            ->with('manual_ticket_log')
            ->orderBy("created_at", "DESC")->get();

请确保最新加入子句中的字段名称。

Answer 2

你可以试试这个

    $display_tickets = ManualTicket::select('u.name as name', 'i.name as initiator', 'manual_tickets.status as status', 'manual_tickets.description as description', 'manual_tickets.location as location', 'manual_tickets.created_at as created_at', 'manual_tickets.initiator_id as initiator_id', 'manual_tickets.id as manual_ticket_id','manual_tickets.manual_ticket_log as manual_ticket_log_id')
        ->leftJoin('users as u', 'u.id', '=', 'manual_tickets.user_id')
        ->leftJoin('users as i', 'i.id', '=', 'manual_tickets.initiator_id')
        ->where(function ($checkClients) use($target_client_id){
            $checkClients->where('u.client_id', '=', $target_client_id)
                ->orWhere('i.client_id', '=', $target_client_id);
        })
        ->whereBetween('manual_tickets.created_at', [$start_date->toDateString(), $end_date->addDays(1)->toDateString()])
        ->with(['manual_ticket_log' => function($query) {
                $query->select('field1', 'field2');
          }])
        ->orderBy("created_at", "DESC")->get();

或者这样做

->with('manual_ticket_log:field1, field2')

Answer 3

您可以利用 Laravel 关系使代码更具可读性并避免昂贵的leftJoin：

 $display_tickets = ManualTicket::select('*')
     ->with([ 'user', 'initiator', 'manual_ticket_log' ])
     ->where(function ($checkClients) use($target_client_id){
         $checkClients->whereHas('user', function ($checkClient) use($target_client_id){
              $checkClient->where('client_id', '=', $target_client_id);
        })->orWhereHas('initiator', function ($checkClient2) use($target_client_id){
              $checkClient2->where('client_id', '=', $target_client_id);
       }));
     })->whereBetween('created_at', [$start_date->toDateString(), $end_date->addDays(1)->toDateString()])
     ->orderBy("created_at", "DESC")
     ->get();