adding new admin page to backend(magento 2)

Question

I can get into the execute() function if I do not run the construct function. but I cannot find the bug in my __construct function. The file is \app\code\Cleargo\Contactus\Controller\Adminhtml\Grid\Index.php

namespace Cleargo\Contactus\Controller\Adminhtml\Grid;

use Magento\Backend\App\Action;

class Index extends  Action

{
    const ADMIN_RESOURCE = 'Cleargo_Contactus::add_row';

protected $resultPageFactory;

public function __construct(
            \Magento\Backend\App\Action\Context $context,
            \Magento\Framework\View\Result\PageFactory $resultPageFactory
){
     parent::__construct($context);
    $this->resultPageFactory = $resultPageFactory;
}

public function execute()
{

    $resultPage = $this->resultPageFactory->create();
    $resultPage->getConfig()->getTitle()->prepend(__('Department'));

    return $resultPage;
}
}

Answer 1

try same as above code,

namespace Cleargo\Contactus\Controller\Adminhtml\Grid;


class Index extends  \Magento\Backend\App\Action

{
    const ADMIN_RESOURCE = 'Cleargo_Contactus::add_row';

protected $resultPageFactory;

public function __construct(
            \Magento\Backend\App\Action\Context $context,
            \Magento\Framework\View\Result\PageFactory $resultPageFactory
){
     parent::__construct($context);
    $this->resultPageFactory = $resultPageFactory;
}

public function execute()
{

    $resultPage = $this->resultPageFactory->create();
    $resultPage->getConfig()->getTitle()->prepend(__('Department'));

    return $resultPage;
}
}

After adding same code and you must have to remove var folder from root and deploy command.

php bin/magento setup:static-content:deploy

Answer 2

You need to add the _isAllowed method to your admin controller action to check the permissions to run it.

Assuming that your constant ADMIN_RESOURCE corresponds to the ACL resource you declared for this route, you should add the following code to your action class:

protected function _isAllowed()
{
    return $this->_authorization->isAllowed(self::ADMIN_RESOURCE);
}