Error while overriding block via preference in Magento 2

October 19, 2015 - Magento 2

While overriding block via preference, Magento 2 can show an error when you add a core registry in a construct method.

If the error looks as follows:

Recoverable Error: Argument 2 passed to Magento\Catalog\Block\Product\ProductList\Toolbar::__construct() must be an instance of Magento\Catalog\Model\Session, array

1	Recoverable Error: Argument 2 passed to Magento\Catalog\Block\Product\ProductList\Toolbar::__construct() must be an instance of Magento\Catalog\Model\Session, array

you can easily fix the problem.

Probably, Toolbar block has many dependencies, but at the same time you don’t pass them.

public function __construct(

   \Magento\Framework\View\Element\Template\Context $context,

   \Magento\Catalog\Model\Session $catalogSession,

   \Magento\Catalog\Model\Config $catalogConfig,

   ToolbarModel $toolbarModel,

   \Magento\Framework\Url\EncoderInterface $urlEncoder,

   ProductList $productListHelper,

   \Magento\Framework\Data\Helper\PostHelper $postDataHelper,

   array $data = []

)