migration.php

<?php

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

class ProductImagesTable extends Migration {

	/**
	 * Run the migrations.
	 *
	 * @return void
	 */
	Schema::create('product_images', function($t){
			$t->increments('id');
			$t->integer('product_id')->unsigned();
			$t->string('title');
			$t->string('image')->nullable();
			$t->string('image_crops')->nullable();
			$t->integer('position');
			$t->boolean('visible')->nullable()->index();
			$t->timestamps();
			
			$t->index(['position', 'created_at']);
			$t->foreign('product_id')->references('id')->on('products')->onUpdate('cascade')->onDelete('cascade');
			
		});
	}

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

}