public function rules()
{
    return[
       [['email', 'password'], 'required'],
        ['email', 'email'],
        ['email', 'unique', 'targetClass' => 'appModelsUser'],
        ['password', 'string', 'min' => 2, 'max' => 10]
    ];
}

public function signup()
{
    $user = new User();
    $user->email = $this->email;
    $user->password = $this->password;
    return $user->save();
}

if (isset($_POST['Signup']))
    {
        $model->attributes = Yii::$app->request->post('Signup');

        if ($model->validate() && $model->signup())
        {
            return $this->goHome();
        }
    }

    return $this->render('signup',
        ['model'=>$model]);
}