Why is DI working in controller but not in Blocks?

Question

I was trying my hand on Magento 2. I am able to get the checkout session data inside a controller by injecting \Magento\Checkout\Model\Session $checkoutSession, in controllers construct method.

But when I try to do the same in a Block class, Im unable to get any data from check out session.

<?php
namespace Company\Hello\Block;

class Main extends \Magento\Framework\View\Element\Template
{
    protected $_checkoutSession;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Company\Hello\Model\Test $model,
        \Magento\Framework\App\Request\Http $request,
        \Magento\Checkout\Model\Session $checkoutSession
    )
    {
        $this->_model   =   $model;
        $this->_request =   $request;
        $this->_checkoutSession = $checkoutSession;
        parent::__construct($context);
    }
    protected function _prepareLayout()
    {
        // print_r($this->_request->getParams());
        // exit;
        // $this->_model->getDbData();
        $this->setCntnt(__('Hello World 2.0'));
    }
    public function getAddedProduct()
    {
        foreach ($this->_checkoutSession->getQuote()->getAllVisibleItems() as $item) {
            echo $item->getName();
        }
        exit('block class');
    }
}

Whereas I am able to access the object ($this->_checkoutSession) but can't get any value.

I call the method getAddedProduct() in the template file

can someone clarify this please?

Answer 1

You need to inject Checkout session and need to create()

public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
       \Magento\Checkout\Model\SessionFactory $session
    ) {
        $this->session= $session;
       parent::__construct($context);
    }

then use getAllVisibleItems

 $checkout = $this->session->create()->getQuote();
    foreach ($checkout->getAllVisibleItems() as $item) {  
      echo $item->getName();
    }

if work then plz accept the answere.

Answer 2

In your construct method, add $this->_isScopePrivate = true;. Take a look: vendor/magento/module-checkout/Block/Onepage/Link.php

You can try cacheable="false" in your layout xml also.

Read more: How do disable caching of custom block on product view page?