I'm trying to create a custom widget by extending the existing "Banner Rotator" widget. Something similar to this.
I placed the widget.xml
in my module and created a class extending \Magento\Banner\Block\Widget\Banner
. Then my custom widget started to appear in BO and works fine (works just like the Magento widget because I haven't customized it yet).
Now I intend to do some additional manipulations to the rotator using the applied layered navigation filters. To do that I'm trying to inject the \Magento\Catalog\Model\Layer\Resolver
in to my class. But it fails with this error message.
Fatal error: Uncaught TypeError: Argument 4 passed to
MyNamespace\Module\Block\Widget\Banner::__construct() must be an
instance of Magento\Catalog\Model\Layer\Resolver, none given, called
in
/var/www/html/var/generation/MyNamespace/Module/Block/Widget/Banner/Interceptor.php
on line 14 and defined in
/var/www/html/app/code/MyNamespace/Module/Block/Widget/Banner.php on
line 12
Looks like I cannot have a fourth argument in my class.
My class looks like below.
namespace MyNamespace\Module\Block\Widget;
class Banner extends \Magento\Banner\Block\Widget\Banner
{
protected $layerResolver;
public function __construct(
\Magento\Framework\View\Element\Template\Context $context,
\Magento\Banner\Model\ResourceModel\Banner $resource,
array $data = [],
\Magento\Catalog\Model\Layer\Resolver $resolver
)
{
parent::__construct(
$context,
$resource,
[]
);
$this->layerResolver = $resolver;
}
}
How do I add the 4th argument?
Best Answer
You just need to delete var/generation folder because every time when you construct new class in __construct() function. Magento 2 create Interceptor.php with constucted class.
For example you have controller at
For this controller Magento 2 create Interceptor.php at
So when you refresh second time Magento 2 look for construct class in Interceptor.php. So when you construct new class in controller you need to delete old constructed class in var/generation folder manually or by this command: