source: database/migrations/2019_02_28_154632_create_roles_permissions_table.php

<?php

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

class CreateRolesPermissionsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('roles_permissions', function (Blueprint $table) {
            $table->integer("role_id")->unsigned();
            $table->foreign("role_id")->references("id")->on("roles");
            $table->integer("permission_id")->unsigned();
            $table->foreign("permission_id")->references("id")->on("permissions");
            $table->primary(["role_id", "permission_id"]);
        });
    }

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