Orsdxy

I am quite new to Magento and have the requirement to add a predetermined free product to the shopping cart each time the customer adds something else. So far I have added an observer to watch for the 'checkout_cart_product_add_after' event.

I have used the following code in my observer but when I add a product to the cart, a message is displayed saying

"We can't add this product to the basket right now"

use MagentoFrameworkEventObserverInterface;

use MagentoFrameworkAppRequestInterface;

use MagentoFrameworkViewResultPageFactory;



class AddProduct implements ObserverInterface

{

    protected $resultPageFactory;

    protected $_productRepository;

    protected $_cart;

    protected $formKey;



    public function __construct(

        MagentoCatalogModelProductRepository $productRepository,

        MagentoCheckoutModelCart $cart,

        MagentoFrameworkDataFormFormKey $formKey,

        PageFactory $resultPageFactory

    )

    {

        $this->resultPageFactory = $resultPageFactory;

        $this->_productRepository = $productRepository;

        $this->_cart = $cart;

        $this->formKey = $formKey;

    }



    public function execute(MagentoFrameworkEventObserver $observer)

    {

        $productId =10;



        $params = array(

            'form_key' => $this->formKey->getFormKey(),

            'product' => $productId, //product Id

            'qty'   =>1 //quantity of product

        );

        //Load the product based on productID

        $_product = $this->product->load($productId);

        $this->cart->addProduct($_product, $params);

        $this->cart->save();



    }



}

I hope somebody is able to explain what is going wrong here or point me in a different direction if this approach will not work. I am using version 2.2 of Magento.

Many thanks

protected $formKey;   

protected $cart;

protected $product;



public function __construct(

MagentoFrameworkAppActionContext $context,

MagentoFrameworkDataFormFormKey $formKey,

MagentoCheckoutModelCart $cart,

MagentoCatalogModelProduct $product,

array $data = ) {

    $this->formKey = $formKey;

    $this->cart = $cart;

    $this->product = $product;      

    parent::__construct($context);

}



public function execute()

 { 

  $productId =10;

  $params = array(

                'form_key' => $this->formKey->getFormKey(),

                'product' => $productId, //product Id

                'qty'   =>1 //quantity of product                

            );              

    //Load the product based on productID   

    $_product = $this->product->load($productId);       

    $this->cart->addProduct($_product, $params);

    $this->cart->save();

 }