问题 I have this DatabaseSeeder.php: <?php use Illuminate\Database\Seeder; use Illuminate\Database\Eloquent\Model; class DatabaseSeeder extends Seeder { /** * Run the database seeds. * * @return void */ public function run() { Model::unguard(); $this->call('MemberInvitationSeeder'); } } I have this file MemberInvitationSeeder.php, sibling to the DatabaseSeeder.php file <?php use Illuminate\Database\Seeder; use App\MemberInvitation; class MemberInvitationSeeder extends Seeder { public function run(