SQLSTATE[23000]: Integrity constraint violation: 19 NOT NULL constraint failed: votings.name (SQL: insert into "votings" ("name", "updated_at", "created_at") values (?, 2020-12-17 17:35:44, 2020-12-17 17:35:44))

<?php

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

class CreateVotingsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('votings', function (Blueprint $table) {
            $table->id();
            $table->String('name');
            $table->String('article');
            $table->timestamps();
        });
    }

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

<?php

use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\Route;
use App\Models\Voting;
use Illuminate\Http\Request;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/', function () {
    /* Votingモデルを全て取得して表示する。 */
    $votings = Voting::all();
    return view('votings', ['votings' => $votings]);
});

//Postはデータを送信するという意味
Route::post('/voting', function (Request $request) {
    $validator = Validator::make($request->all(), [
        'result' => 'required|max:255',
    ]);

    $voting = new Voting;
    $voting->name = $request->result;
    $voting->save();
    return redirect('/');
});

@extends('layouts.app')

@section('content')
<div class="container">
    <div class="col-sm-offset-2 col-sm-8">
        <div class="panel panel-default">
            <div class="panel-heading">
                新しい記事
            </div>

            <div class="panel-body">
                @include('common.errors')
                <!-- 新しい投稿を作る -->
                <form action="/voting" method="POST" class="form-horizontal">
                    {{ csrf_field() }}
                    <!-- 記事の名前 -->
                    <div class="form-group">
                        <label for="task-name" class="col-sm-3 control-label">記事</label>
                        <div class="col-sm-6">
                            <input type="text" name="name" id="voting-name" class="form-control" value="{{ old('voting')}}">
                        </div>
                    </div>
                    <!-- add voting -->
                    <div class="form-group">
                        <div class="col-sm-offset-3 col-sm-6">
                            <button type="submit" class="btn btn-default">
                                <i class="fa fa-plus"></i>記事を追加する
                            </button>
                        </div>
                    </div>
                </form>
            </div>
        </div>
        <!-- 記事一覧 -->
        @if (count($votings)>0)
           <div class="panel-body">
               <div class="panel-heading">
                記事一覧
               </div>

               <div class="panel-body">
                   <table class="table table-striped task-table">
                       <thead>
                           <th>記事</th>
                           <th>&nbsp;</th>
                        </thead>
                       <tbody>
                           @foreach ($votings as $voting)
                              <tr>
                                  <td class="table-text">
                                      <div class="table-text">{{$voting->name}}</div>
                                  </td>
                            <!-- 記事削除 -->
                                   <td>
                                       <form action="/voting/{{ $voting->id}}" method="POST">
                                           {{ csrf_field() }}
                                           {{　method_field('DELETE') }}

                                            <button type="submit" class="btn btn-danger">
                                                <i class="fa fa-trash"></i>削除
                                            </button>
                                        </form>
                                    </td>
                                </tr>
                            @endforeach
                        </tbody>
                    </table>
                </div>
            </div>
        @endif
    </div>
</div>
@endsection