Magento – Magento 2: How to call helper function in Controller

helpermagento-2.1

How to call helper function in controller:-

I have use below code:-

class Index extends \Magento\Framework\App\Action\Action
{
    protected $helperData;

    public function __construct(
         ....
        \{Vendor}\{Module}\Helper\Data $helperData,
        ....
    ) {
        ....
        $this->helperData = $helperData;
        ....
    }       

    public function execute()
    {
        $this->helperData-><functionName>();
        return;     
    }
}

this code give me error as below:-

Uncaught TypeError: Argument 2 passed to {Vendor}\{Module}\Controller\Callforprice\Index::__construct() must be an instance of {Vendor}\{Module}\Helper\Data, none given, called in

Best Answer

Code is correct. This happened to me many times. I have cleared /var/generation directory when altering constructor parameters.

Hope this helps.

Related Solutions

Magento – How to override core helper in magento 2

you can do it this way, but you have to extend the original helper, because all classes that use it, actually expect an instance of the original helper (or a derived class)

Magento – Magento 2 “Recoverable Error: Argument 2 passed” when trying to define model in constructor

Replace __construct method following code:


public function __construct(
    Action\Context $context,
    \Magento\Store\Model\App\Emulation $appEmulation,
    \Magento\Cms\Model\Template\FilterProvider $filterProvider,
    PostDataProcessor $dataProcessor
) {
    $this->dataProcessor = $dataProcessor;
    $this->filterProvider = $filterProvider;
    $this->appEmulation = $appEmulation;
    parent::__construct($context);
}

Note:

For Magento 2.0.x and 2.1.x

You need to remove var/generation/* folder content

For Magento 2.2.x ( generation folder is moved out from var folder and rename as generated in Magento 2.2.x )

You need to remove generated/* folder content except .htaccess file.

Best Answer

Related Solutions

Magento – How to override core helper in magento 2

Magento – Magento 2 “Recoverable Error: Argument 2 passed” when trying to define model in constructor

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