Laravel - 未定义的属性：Illuminate\Database\MySqlConnection::$username答案

【问题标题】：Laravel - Undefined property: Illuminate\Database\MySqlConnection::$usernameLaravel - 未定义的属性：Illuminate\Database\MySqlConnection::$username
【发布时间】：2019-10-18 13:21:03
【问题描述】：

我写了一个查询来将参数从视图传递到控制器，我得到了这个错误：

未定义属性：Illuminate\Database\MySqlConnection::$username

查看传参

<td width="25%"><a class="btn btn-info" href="{{ route('gamesListDetail',$game->id) }}">{{ $game->name }}</a></td>

接收控制器

    public function gamesListDetail($id = null)
    {
    $gamelists = DB::table("platform_games")
        ->select("platform_games.id", "platform_games.username","game_player.game_id")
        ->join("game_player","game_player.game_id","=","platform_games.id")
            ->where('platform_games.id',$id)
            ->take(5);
        return view('soccerrave.games.gamesListDetail', compact('gamelists'));
    }

接收视图

    <tbody>
        @foreach($gamelists as $key => $gamelist)
            <tr>
                <td>{{ ++$key }}</td>

                <td>{{ $gamelist->username }}</td>


            </tr>
        @endforeach
            <tr>
            <td colspan="8">
                {{ $gamelists->links() }}
            </td>
            </tr>         
    </tbody>

我希望视图根据参数显示前 5 个数据。但是我收到了这个错误：

未定义属性：Illuminate\Database\MySqlConnection::$username

【问题讨论】：

标签： laravel

【解决方案1】：

Documentation 说：

跳过/采取

限制从查询返回的结果数量，或跳过给定查询中的结果数量，您可以使用skip 和take 方法：

$users = DB::table('users')->skip(10)->take(5)->get();

所以通过例子我们看到take方法之后必须有get()调用。

所以修复你的代码：

public function gamesListDetail($id = null)
{
    $gamelists = DB::table("platform_games")
                     ->select(
                       "platform_games.id", 
                       "platform_games.username",
                       "game_player.game_id"
                     )
                     ->join(
                       "game_player",
                       "game_player.game_id", "=", "platform_games.id"
                     )
                     ->where('platform_games.id', $id)
                     ->take(5)
                     ->get(); // this one is required

    return view('soccerrave.games.gamesListDetail', compact('gamelists'));
}

【讨论】：