Question

我收到此错误：

Connection.php第647行中的ErrorException：SQLSTATE [42S22]：找不到列：1054'where子句'中的未知列'comments.dummy_id'（SQL：select * from comments其中comments 。dummy_id = 1和comments。dummy_id不为空）（查看：C：\ xampp \ htdocs \ app \ resources \ views \ post.blade.php）

我有两张桌子，一张叫做假人，另一张叫做评论。我知道它应该被称为post而不是dummies我的坏。我在评论表上创建了一个外键，链接到虚拟表中名为id的字段。

这是假人移民文件，本应该被称为帖子：

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateDummiesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('dummies', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->text('body');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('dummies');
    }
}

这是评论迁移文件：

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateCommentsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('comments', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('post_id');
            $table->string('name');
            $table->text('body');
            $table->timestamps();
            $table->foreign('post_id')->references('id')->on('dummies');

        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('comments');
    }
}

如果您需要用户或任何其他迁移文件，请告诉我们。我只展示了那两个，因为我相信这就是问题所在。我很困惑，为什么它在一个甚至不存在的字段上给我一个错误，即dummy_id字段。

这是MattClark要求的post.blade.php文件：

<!DOCTYPE html>
<html>
  <head>

    <!--Import Google Icon Font-->
    <link href="http://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
    <!--Import materialize.css-->
    <link type="text/css" rel="stylesheet" href="../css/materialize.min.css"  media="screen,projection"/>
    <link type="text/css" rel="stylesheet" href="../css/main.css"  media="screen,projection"/>
      @yield('css')
    <!--Let browser know website is optimized for mobile-->
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  </head>

  <body>
      @include('layout.nav')

      <main>
        <h3> {{ $post->name }}</h3>
        <p>{{ $post->created_at->toDayDateTimeString() }}</p>
        <p> {{ $post->body }}</p>
      </main>
      <ul>
        @foreach($post->comments as $comment)
        <li>{{ $comment->body }}</li>
        @endforeach
      </ul>
       @include('layout.footer')
    <!--Import jQuery before materialize.js-->
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script type="text/javascript" src="../js/materialize.min.js"></script>
      @yield('javascript')
  </body>
</html>

Answer 1

默认情况下，laravel假定您的外键为dummy_id。无论您将其命名为什么，都可以在Dummy或Post模型中进行更改。

public function comments()
{
    return $this->hasMany('App\Comment', 'post_id');
}

当我尝试显示每个帖子的评论时出错

1 个答案: