Product::beforeValidate PHP Method

    public function beforeValidate()
    {
        foreach ($this->getTypeAttributes() as $attribute) {
            if ($attribute->isType(Attribute::TYPE_CHECKBOX)) {
                continue;
            }
            if ($attribute->isRequired() && (!isset($this->_typeAttributes[$attribute->id]) || '' === $this->_typeAttributes[$attribute->id])) {
                $this->addError($attribute->title, Yii::t("StoreModule.store", "{title} attribute is required", ['title' => $attribute->title]));
            }
        }
        if (!$this->isInStock()) {
            $this->setEmptyQuantity();
        }
        return parent::beforeValidate();
    }