izyim-api/database/migrations/2018_06_04_072809_create_shipmentitems_table.php

<?php

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

class CreateShipmentitemsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('shipmentitems', function (Blueprint $table) {
            $table->increments('id');
            $table->unsignedInteger('so_id');
            $table->foreign('so_id')
                  ->references('id')->on('sos')
                  ->onDelete('cascade');
            $table->unsignedInteger('sa_id');
            $table->foreign('sa_id')
                  ->references('id')->on('shipments')
                  ->onDelete('cascade');
            $table->timestamps();
        });
    }

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