How to Inject a new Class to Overridden Class using Preference

Question

I want to override __prepareLayout function from 'Magento\Sales\Block\Order\History' so I used the preference.

In my di.xml

<preference for="Magento\Sales\Block\Order\History" type="Custom\Module\Block\Order\History"/>

In my History.php

class History extends \Magento\Sales\Block\Order\History
{
    protected function _prepareLayout()
    {
        parent::_prepareLayout();
        $this->setTemplate('Custom_Module::order/history.phtml');
        return $this;
    }

}

To this point my code is working fine now I want to inject custom Helper in this class.

So I added this-

    public function __construct(
        \Custom\Module\Helper\Data $helper
    ) {
        $this->helper   =   $helper;
    }

After Injecting Class the code is not working. I have the option to use ObjectManager, but it is not recommended, so I preferred to ask from Community if you have any better Option!

Answer 1

you need to call parent constructor also with required parameters

public function __construct(
    \Magento\Framework\View\Element\Template\Context $context,
    \Magento\Sales\Model\ResourceModel\Order\CollectionFactory $orderCollectionFactory,
    \Magento\Customer\Model\Session $customerSession,
    \Magento\Sales\Model\Order\Config $orderConfig,
    \Custom\Module\Helper\Data $helper
) {
    $this->_orderCollectionFactory = $orderCollectionFactory;
    $this->_customerSession = $customerSession;
    $this->_orderConfig = $orderConfig;
    $this->helper   =   $helper;
    parent::__construct($context, $orderCollectionFactory, $customerSession, $orderConfig);
}