<?php

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

class CreateReviewsTable extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('reviews', function(Blueprint $table)
        {
            $table->increments('id');
            $table->text('content');
            $table->string('author', 255)->nullable();
            $table->integer('rating');
            $table->integer('user_id');
            $table->integer('paper_id');
            $table->timestamp('created_at');
        });
    }

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

}

<?php

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

class CreateReviewsTable extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('reviews', function(Blueprint $table)
        {
            $table->increments('id');
            $table->text('content');
            $table->integer('rating');
            $table->integer('user_id');
            $table->integer('paper_id');
            $table->timestamp('created_at');
        });
    }

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

}

Remove author attr in reivew table(useless)
Remove author attr in reivew table(useless)
