How to get current product in magento 2 observer without registry

Question

I need to get the current product details in magento2 observer without using the registry.because magento latest version is deprecated this registry. I need the current product for reviews. when submit the form send the email

please help me.

Answer 1

This all depends on the event you are observering. Events can be fired from anywhere and usually have data assigned to the event itself - it may not always be the case that a product is defined in the registry when an event is fired.

If you are working with an event like catalog_product_save_after for example, you can access the product being saved like:

public function execute(\Magento\Framework\Event\Observer $observer): void
{
    $product = $observer->getEvent()->getData('product');
    if (!$product instanceof \Magento\Catalog\Api\Data\ProductInterface) {
        return;
    }
    
    // We now have a valid $product, do whatever with it.
    $product->setData('foo', 'bar');
}

EDIT:

As you've mentioned in comments, it appears the event in question is review_save_after. The below code should work in your observer class:

/* @var $review \Magento\Review\Model\Review */
$review = $observer->getEvent()->getObject();
foreach ($review->getProductCollection() as $product) {
    // We now have access to each $product associated to the review.
    $product->setData('foo', 'bar');
};

Answer 2

Yes, but the deprecated here is just a notice, and It stands in code for a long time, I'm using it day-by-day tasks and have no consequences, the registry still contains the data, so why not,

Answer 3

If you don't want to use Registry, you can try using $this->request->getParams().

You can get id in params,

$this->getRequest()->getParams();

For Product Id,

$this->request->getParam('product_id'); // Use this class in construct() \Magento\Framework\App\RequestInterface

In your Controller file

protected $request;

public function __construct(
        \Magento\Framework\App\RequestInterface $request
    ) {
        $this->request = $request;
    }

public function execute()
{
    $this->request->getParam('product_id');
}

To get id in getParam() you need to pass it as hidden field in phtml file

In your phtml file,

<input type="hidden" name="product_id" value="<?php echo $product_id ?>"> 

In Observer & Plugin File:- It depends on which event you want to observe and same goes for the plugin. If you're passing as hidden field and calling a observer on that particular event, you can get id as i mentioned above.