Laravel eloquent 按预加载分组排序

Question

我有一个查询，它运行 group by 和 order by 预加载，看起来 group by 工作正常但 order by 不起作用。

Message::whereIn('conversation_id',$msgs)
        ->where('deleted', '!=', $userId)
        ->with(array('last_sender' =>function($query) use ($userId){
                $query->where('id','!=', $userId);
                $query->select('id', 'userName', 'profilePic','firstName', 'lastName');
          }))

         ->with(array('last_reciever' =>function($query) use ($userId){
                $query->where('id','!=', $userId);
                $query->select('id', 'userName', 'profilePic','firstName', 'lastName');
          }))
         ->orderBy('id', 'desc')
         ->orderBy('conversation_id', 'desc') 
         ->groupBy('id')
         ->groupBy('conversation_id')
         ->get();

它 return 的数据是这样的

{
"data": [
    {
        "id": 133,
        "conversation_id": 13,
        "last_sender": null,
        "last_reciever": {
            "id": 55,
            "userName": "buyer",
            "profilePic": "pRBDBFJW55baSnF560Ajid8jTgPo5kmg4i5LMhPG.jpeg",
            "firstName": "Matti",
            "lastName": "Rames"
        },
        "msg": "second message 2 to user second",
        "attachment": null,
        "deleted": 0,
        "seen": 0,
        "created_at": "2017-10-17 15:43:14",
        "updated_at": "2017-10-17 15:43:14"
    },
    {
        "id": 132,
        "conversation_id": 11,
        "last_sender": null,
        "last_reciever": {
            "id": 54,
            "userName": "Sadek",
            "profilePic": "Nir7zgorNT2dmwcXJdhNK3ZmPAltmkEnj0SXDCDC.png",
            "firstName": "Sadek",
            "lastName": "Hossain"
        },
        "msg": "second message to first user",
        "attachment": null,
        "deleted": 0,
        "seen": 0,
        "created_at": "2017-10-17 15:38:16",
        "updated_at": "2017-10-17 15:38:16"
    },
    {
        "id": 131,
        "conversation_id": 13,
        "last_sender": null,
        "last_reciever": {
            "id": 55,
            "userName": "buyer",
            "profilePic": "pRBDBFJW55baSnF560Ajid8jTgPo5kmg4i5LMhPG.jpeg",
            "firstName": "Matti",
            "lastName": "Rames"
        },
        "msg": "second message to second user",
        "attachment": null,
        "deleted": 0,
        "seen": 0,
        "created_at": "2017-10-17 15:37:49",
        "updated_at": "2017-10-17 15:37:49"
    },
    {
        "id": 130,
        "conversation_id": 11,
        "last_sender": null,
        "last_reciever": {
            "id": 54,
            "userName": "Sadek",
            "profilePic": "Nir7zgorNT2dmwcXJdhNK3ZmPAltmkEnj0SXDCDC.png",
            "firstName": "Sadek",
            "lastName": "Hossain"
        },
        "msg": "Hi how are you",
        "attachment": null,
        "deleted": 0,
        "seen": 0,
        "created_at": "2017-10-17 15:36:49",
        "updated_at": "2017-10-17 15:36:49"
    }
]

}

但我只想return前两个最新结果。只有 id 133 和 132 我知道我添加了 ->groupBy('id') 这在这里没用，并且 return 了所有记录。我添加它只是为了显示我的数据是什么。所以如果我删除 ->groupBy('id') 那么它只有 returns id 131 和 130

请帮忙。谢谢你。

Answer 1

好的，我添加了一行就解决了:) 我正在发布其他人的帮助。

->orderBy('created_at', 'desc') 
->get()
->unique('conversation_id');

Laravel eloquent 按预加载分组排序

Laravel eloquent order by group by with eager loading

php

eloquent

laravel-5

laravel-eloquent