Question

我在index.blade.php中有一个简单的变量问题{{$last_message}} 但它不起作用，看起来像“Undefined variable: last_message (View: G:\OSPanel\domains\flobex\resources\views\chat\index.blade.php)"

这是我的控制器：

$user = Auth::user();
    $friend = Auth::user();
    $users = User::all();

//  $last_message = Chat::where('user_id', $user->id)->where('friend_id', $friend->id)->orderBy('id', 'desc')->first()->chat;
    $last_message = Chat::select(['chat'])->where('user_id', $user->id)->orderBy('id', 'desc')->first();
  //dump($last_message);

    $search_string = Input::get('search-tag');

    $search_result = null;
    if(!empty($search_string)){
        $search_result = User::where('name', 'like', '%' . $search_string . '%')
            ->orWhere('name', 'like', '%' . strtolower($search_string) . '%')
            ->orWhere('name', 'like', '%' . strtoupper($search_string) . '%')
            ->orWhere('id', strtoupper($search_string))->get();
    }

    $friends = Auth::user()->friends();

    return view('chat.index')
        ->with('user', $user)
        ->with('friend', $friend)
        ->with('friends', $friends)
        ->with('search_result', $search_result)
        ->with('lastMessage', $last_message)
              ->with('users', $users);

以下是模板的一部分：

@forelse ($friends as $friend)
                  <a href="{{ route('chat.show', $friend->id) }}" class="panel-block" style="justify-content: space-between;">
                    <onlineuser v-bind:friend="{{ $friend }}" v-bind:onlineusers="onlineUsers"></onlineuser>
                      <div class="message-box">

                        {{ $friend->name }}

                      </div>
                  </a>
              @empty

                  <div class="panel-block">
                      You don't have any friends
                  </div>
              @endforelse
          {{$last_message}}

为什么变量$ last_message不起作用？

Answer 1

当您执行->with('lastMessage', $last_message)时，您已将变量传递为{{ $lastMessage }}。该变量实际上是with()，但您可能希望更改select * from PredCusts p inner join ( select StartDT, max(PredCustId) max_precustid from PredCusts group by StartDT ) t on t.StartDT = p.StartDT and p.PredCustId = t.max_precustid语句以保持一致性。

Answer 2

使用{{$lastMessage}}代替$last_message。

->with('lastMessage', $last_message)
         ^Key Name       ^data (array/string ...etc)

您必须使用键名来捕获数据。

阅读 Passing Data To Views

为什么未定义变量？

2 个答案: