public function parameters()
    {
        return $this->hasOne('AppUserParameters', 'user_id');
    }

$user = new User();
$user->password = "123";
$user->email = "user@example.com";

$user->parameters()->name = $request->name;
$user->save(); // or ->push();

$user = new User();
$user->password = "123";
$user->email = "oli35@mail.ru";
$user->save();

$parameter = new Parameter();
$parameter->name = $request->name;
$parameter->save();

$user->parameters()->save($parameter);

$user = User::create(['name' => '123', 'email' => 'oli35@mail.ru']);
$user->parameters()->create(['name' => $request->name]);