geolook/database/seeds/DatabaseSeeder.php

<?php

use Carbon\Carbon;
use App\Location;
use App\Role;
use App\User;
use Illuminate\Database\Seeder;

class DatabaseSeeder extends Seeder
{
    /**
     * Seed the application's database.
     *
     * @return void
     */
    public function run()
    {


        factory(Role::class, 1)->create([
            'created_at' => Carbon::now()->subDays(10),
        ])->each(function(Role $role) {
            $role->users()->saveMany(
                factory(User::class, 10)->create([
                    'role_id' => $role->id,
                    'created_at' => Carbon::now()->subDays(10)
                ])->each(function (User $user) {
                    $user->locations()->saveMany(
                        factory(Location::class, random_int(20, 50))->make());
                })
            );
        });
    }
}