Question

我见过很多帖子，但没有什么是蠢蠢欲动的。似乎总是将最老的一组分组。我想对结果进行分组并选择最新的结果。这是我的查询

Message::whereIn('conversation_id',$msgs)
             ->orderBy('created_at', 'desc') 
             ->groupBy('conversation_id')
             ->with(array('last_sender'=>function($query){
                    $query->select('id','userName','profilePic', 'firstName','lastName');
              }))
            ->get();

Answer 1

试试这个

Message::whereIn('conversation_id',$msgs)
             ->with(array('last_sender'=>function($query){
                    $query->select('id','userName','profilePic', 'firstName','lastName');
              }))
             ->orderBy('conversation_id', 'desc') 
             ->groupBy('conversation_id')
            ->get();

Answer 2

要按时间排序，请尝试以下方法：

Message::select(DB::raw('MAX(created_at) AS max_created_at'))
             ->whereIn('conversation_id',$msgs)
             ->orderBy('max_created_at', 'desc') 
             ->groupBy('conversation_id')
             ->with(array('last_sender'=>function($query){
                    $query->select('id','userName','profilePic', 'firstName','lastName');
              }))
            ->get();

如何使用group by和order by返回最新数据

2 个答案: