php - Laravel - 如何按 ID 升序对对象数组进行排序

Question

我需要按名为 $messages 的 ID 对对象数组进行升序排序，我尝试了很多方法，但似乎都不起作用。这是我尝试过的:

public function getMessagesPage(Request $request)
    {
        $user_id = $request->session()->get('id');

        $user_second = User::where('username', $request->username)->first();

        $messages_1 = Messages::where('user_1', $user_id, 'AND')->where('user_2', $user_second->id)->orderBy('id', 'asc')->get();
        $messages_2 = Messages::where('user_2', $user_id, 'AND')->where('user_1', $user_second->id)->orderBy('id', 'asc')->get();

        $messages = $messages_1->merge($messages_2);

        $messages = collect($messages);
        $messages->sortBy('id');

        return view('messages')->with('messages', $messages)->with('user_id', $user_id)->with('user_second', $user_second);
    }

Answer 1

您可以使用 sortBy() 对您的集合进行排序，但请记住该函数返回已排序的集合，不会改变原始集合 ，所以你必须改变这一行:

//$messages->sortBy('id');
$messages = $messages->sortBy('id');

作为更好的选择，您可以对所有消息进行排序，只需一个查询:

$messages = Messages::where([['user_1', $user_id], ['user_2', $user_second->id]])
               ->orWhere([['user_2', $user_id], ['user_1', $user_second->id]])
               ->orderBy('id', 'asc')
               ->get()

这与编写此 SQL 相同:

select * from messages 
    where (user_1 = $user_id and user_2 = $user_second->id) 
    or (user_2 = $user_id and user_1 = $user_second->id) 
    order by id asc