What causes an error when trying to register a user in Yii2?

Question

Yii

Yii2 basic version 2.0.9 took the SignupForm.php and signup.php files from the advanced version, corrected all dependencies, added the missing functions to SiteController.php and User.php. After clicking the "register" button, an error appears in the debugger:

exception 'yii\base\UnknownPropertyException' with message 'Getting unknown property: yii\web\Application::app' in D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\base\Component.php:143
Stack trace:
#0 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\di\ServiceLocator.php(73): yii\base\Component->__get('app')
#1 D:\OpenServer\domains\yii2sp\ models\User.php(79): yii\di\ServiceLocator->__get('app')
#2 D:\OpenServer\domains\yii2sp\models\SignupForm.php(63): app\models\User->generateAuthKey ()
#3 D:\OpenServer\domains\yii2sp\controllers\SiteController.php(131): app\models\SignupForm->signup()
#4 [internal function]: app\controllers\SiteController->actionSignup()
#5 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\base\InlineAction.php(55): call_user_func_array(Array, Array)
#6 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\base \Controller.php(154): yii\base\InlineAction->runWithParams(Array)
#7 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\base\Module.php(454): yii\base\Controller ->runAction('signup', Array)
#8 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\web\Application.php(87): yii\base\Module->runAction('site/signup' , Array)
#9 D:\OpenServer\domains\yii2sp\vendor\yiisoft\yii2\base\Application.php(375): yii\web\Application->handleRequest(Object(yii\web\Request))
#10 D :\OpenServer\domains\yii2sp\web\index.php(12): yii\base\Application->run()
#11 {main}

The website has the following error:

Getting unknown property: yii\web\Application::app

in D:\OpenServer\domains\yii2sp\models\User.php

public function generateAuthKey(){
        $this->auth_key = Yii::$app->app->security->generateRandomString();
    }

in D:\OpenServer\domains\yii2sp\models\SignupForm.php
$user->generateAuthKey();
in D:\OpenServer\domains\yii2sp\controllers\SiteController.php
if ($user = $model->signup()) {
in D:\OpenServer\domains\yii2sp\web\index.php
(new yii\web\Application($config))->run();

Answer 1

SingupForm has something like this in the validation rules.
Find something to change?

Answer 2

Check that the User is in the common/models/ path (they may differ in basic and advanced), and that User has this namespace specified.

Answer 3

Class '\common\models\User' does not exist for you. Correct namespace in SignupForm. The common folder exists in advanced, but it doesn't exist in basic

Answer 4

You clearly indicated in the stack trace where the error is - Yii::$app-> app-> security->generateRandomString();
Bold - delete.