/**
* Signs user up.
*
* @return User|null the saved model or null if saving fails
*/
public function signup()
{
if (!$this->validate()) {
return null;
$auth = Yii::$app->authManager;
$authorRole = $auth->getRole('author');
$auth->assign($authorRole, $user->getId());
}
$user = new User();
$user->username = $this->username;
$user->email = $this->email;
$user->setPassword($this->password);
$user->generateAuthKey();
return $user->save() ? $user : null;
}
