Laravel 8 | 如何在同一张表上连接两个外键

Question

Fields 'to_user_id' and 'from_user_id' are two id that are on the users table, since they have different values how to join my model 'Message' with the users table

   $my_inbox=Message::select('messages.*', 'users.name toUser', 'users.name as fromUser')
            ->join('users', 'users.id', '=', 'to_user_id.user_id')
            ->join('users', 'users.id', '=', 'from_user_id.user_id')
            ->get();

Answer 1

Use différent aliases to join same table. You see that selecting the same field is conflicting with what you want.

$my_inbox=Message::select('messages.*', 'receiver.name toUser', 'sender.name as fromUser')
            ->join('users as receiver', 'receiver.id', '=', 'to_user_id.user_id')
            ->join('users as sender', 'sender.id', '=', 'from_user_id.user_id')
            ->get();

Or if you had set the correct relation in the Message class and the user class

$my_inbox = $loggedUser->receivedMessages()->with('sender')->get();