Admin always return default store code, not admin

[hiephm]

In admin controller, the following code will not work as expected (always return false):

/** @var \Magento\Store\Model\StoreManagerInterface $storeManager */
$storeManager->getStore()->getCode() == \Magento\Store\Model\Store::ADMIN_CODE;

because the 'admin' store code is not set anywhere in Action class.
Magento 1 does this properly by hooking to 'adminhtml_controller_action_predispatch_start' event and set it:

// in Mage_Adminhtml_Model_Observer
    public function bindStore()
    {
        Mage::app()->setCurrentStore('admin');
        return $this;
    }

Following code doesn't work, see update below:
Magento 2 does not have such event, but we can use 'controller_action_predispatch' in adminhtml/events.xml in any module, then set 'admin' store code:

/** @var \Magento\Store\Model\StoreManagerInterface $storeManager */
$this->storeManager->setCurrentStore('admin');

I can create a pull request if necessary.

UPDATE 1: above fix will cause unset of website when saving products, there maybe easier ways to check if current store is admin, now I am using \Magento\Backend\Model\Auth::isLoggedIn()

[dmitrii-fediuk]

#2254
#2064
https://mage2.pro/t/128

[hiephm]

Thanks for more info, @dfediuk
I believe this is a bug and should be fixed.
@antonkril : the \Magento\Store\Api\StoreResolverInterface::getCurrentStoreId also incorrectly return 'default' instead of 'admin', since 'admin' never got set.

[hshar7]

Hi @hiephm the best way to check whether the request is coming from admin panel is to use \Magento\Framework\App\State::getAreaCode == \Magento\Framework\App\Area::AREA_ADMINHTML