Laravel orderby join 2 tables without eloquent relationship

Question

我有2个table聊天系统

“用户” table 结构：

id	name

"消息" table 结构：

id	sender_id	receiver_id	message

我想return好友用户按上次你和好友聊天时排序。注意：id 与 timestamp

相同

假设，

id	sender_id	receiver_id	message
1	`$userA->id`	`$userB->id`	abc
2	`$userC->id`	`$userA->id`	xyz

所以，如果 $userA 是登录用户 - 我希望用户 return 像：

[
    0 => $userC,
    1 => $userB,
    2 => $userD,
    3 => $userE,
    4 => $userF,
    ...
]

（其中 $userD、$userE、$userF 没有与用户 $userA 的消息）

基本上我想 return 如果用户有任何与登录用户的消息，则使用排序的所有朋友用户。

我当前的代码给了我一些意想不到的结果 -

return DB::table('users')->leftJoin('messages', function ($join) {
    $join->on('users.id', '=', 'messages.sender_id')
        ->where('messages.sender_id', auth()->id())
        ->orOn('users.id', '=', 'messages.receiver_id')
        ->where('messages.receiver_id', auth()->id());
})
->select('users.*')
->where('users.id', '!=', auth()->id())
->orderBy('messages.id', 'asc')
->get();

Answer 1

老实说，我无法确定这是否有效，因为我无法对其进行测试，但我认为代码应该类似于：

$messagesSent = DB::table('messages')
    ->select('sender_id as other_user', DB::raw('MAX(id) as last_message_id'))
    ->where('receiver_id', auth()->id())
    ->groupBy('sender_id');

$messagesSentOrReceived = DB::table('messages')
    ->select('receiver_id as other_user', DB::raw('MAX(id) as last_message_id'))
    ->where('sender_id', auth()->id())
    ->groupBy('receiver_id')
    ->union($messagesSent);

$usersWithCommunication = DB::table('users')
    ->select('other_user', DB::raw('MAX(last_message_id) as last_message_id'))
    ->joinSub($messagesSentOrReceived, 'latest_messages', function ($join) {
        $join->on('users.id', '=', 'latest_messages.other_user');
    })
    ->groupBy('other_user');
    

return DB::table('users')
    ->leftJoinSub($usersWithCommunication, 'latest_communications', function ($join) {
        $join->on('users.id', '=', 'latest_communications.other_user');
    })
    ->select('users.*')
    ->orderBy('latest_communications.last_message_id', 'asc')
    ->get();

Laravel orderby join 2 tables without eloquent relationship

Laravel orderby joining 2 tables without eloquent relationship

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