One-to-many

create_comments_table.php

<?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->bigIncrements('id');
            $table->bigInteger('article_id')->unsigned();
            $table->string('text');
            $table->integer('star');
            $table->timestamps();
            $table->foreign('article_id')
                    ->references('id')
                    ->on('articles')
                    ->onCascade('delete');
        });
    }

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