final public function validate(): bool
    {
        // validate csrf token if required
        if ($this->_tokenRequired && !$this->_tokenOk) {
            App::$Session->getFlashBag()->add('warning', __('Hack attention: security token is wrong!'));
            return false;
        }
        // get all rules as array from method rules()
        $rules = $this->rules();
        // get default values of attributes
        $defaultAttr = $this->getAllProperties();

        // start validation: on this step class attribute values will be changed to input data if it valid
        $success = $this->runValidate($rules);

        // get not-passed validation fields as array
        $badAttributes = $this->getBadAttributes();
        // prevent warnings
        if (Any::isArray($badAttributes) && count($badAttributes) > 0) {
            foreach ($badAttributes as $attr) {
                if (Str::contains('.', $attr)) { // sounds like dot-separated array attr
                    $attrName = strstr($attr, '.', true); // get attr name
                    $attrArray = trim(strstr($attr, '.'), '.'); // get dot-based array path

                    $defaultValue = new DotData($defaultAttr); // load default attr

                    $dotData = new DotData($this->{$attrName}); // load local attr variable
                    $dotData->set($attrArray, $defaultValue->get($attr)); // set to local prop. variable default value

                    $this->{$attrName} = $dotData->export(); // export to model
                } else {
                    $this->{$attr} = $defaultAttr[$attr]; // just set ;)
                }
                // add message about wrong attribute to session holder, later display it
                $attrLabel = $attr;
                if ($this->getLabel($attr) !== null) {
                    $attrLabel = $this->getLabel($attr);
                }

                App::$Session->getFlashBag()->add('warning', __('Field "%field%" is incorrect', ['field' => $attrLabel]));
            }
        }

        return $success;
    }