Magento 2 : How to reload minicart from Plugin?

Question

I've written plugin for Magento\Checkout\Controller\Cart::Delete

Plugin works great and removed my desirable product from cart.

As much as I know Minicart is render with local storage. So that we have to update it with sections.xml.

But I looked into it and found that sections.xml only contains actions.

So How can I reload minicart whenever I use plugin ?

UPDATE

Thing is like I want to remove one specific product when any changes made to the cart Like, Update qty, Remove existing item from cart etc.

If any of above changes occur than let's say I've product ID-5 that product needs to be remove from automatically.

Example:

I've 4 products in cart including my free product(has price USD 0)

Item Name  -   Qty    
Product-1  -   1
Product-2  -   2
Product-3  -   1
Product-4  -   1
(Free product) 

If any changes to qty happens to products expect free product than free product needs to be removed and qty update will be there for that product.

PS: I've disabled qty update for free product.

What I've tried.

public function beforeExecute(
        \Magento\Checkout\Controller\Cart\Delete $subject
    )
    {
        $items = $this->checkoutSession->getQuote()->getAllVisibleItems();

        foreach ($items as $item) {
            $product = $this->product->load($item->getProductId());
            if($product->getSku() == $this->helperData->getGeneralConfig('free_product')){ // get product sku 
                $this->cart->removeItem($item->getItemId())->save();

                $this->checkoutSession->getQuote()->collectTotals()->save();
            }
         }

        $customerBeforeAuthUrl = $this->url->getUrl('checkout/cart/');
        $this->responseFactory->create()->setRedirect($customerBeforeAuthUrl)->sendResponse();
        die();

    }

Above is working but minicart isn't update. along with side bar total on cart page.

If you have any other solution rather than plugin than add your solution too.

Any help would be appreciated. Thanks in Advance.

Answer 1

In your case, you should use checkout_cart_save_before to add/remove your free product whenever cart is saved. You can see my solution here:

1. app/code/YourVendor/YourModule/etc/frontend/events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_cart_save_before">
        <observer name="training_test_checkout" instance="YourVendor\YourModule\Observer\ValidateFreeProduct"/>
    </event>
</config>

2. app/code/YourVendor/YourModule/Observer/ValidateFreeProduct.php

<?php

namespace YourVendor\YourModule\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer;
use Magento\Checkout\Model\Cart;

class ValidateFreeProduct implements ObserverInterface
{

    /**
     * @param Observer $observer
     * @return void
     */
    public function execute(Observer $observer)
    {
        $event = $observer->getEvent();
        /** @var Cart $cart */
        $cart = $event->getCart();
        if (!$cart instanceof Cart) {
            return;
        }
        $yourCondition = false;
        if (!$yourCondition) {
            $sku = 'your_free_product_sku';
            foreach ($cart->getItems() as $item) {
                if ($item->getProduct()->getSku() == $sku) {
                    $cart->removeItem($item->getItemId());
                }
            }
        }
    }
}

By using this event, when you delete/update your cart, the mini cart will be updated automatically

Cheers