Customise price in product collection Magento 2

Question

I am working on Magento 2 and having issue with price.

I want to customise the product price. I did it via plugin and it's working fine on product page and list page.

As we are using a plugin, it is not overriding the price in collection with custom price. Due to this price filter is also not working according to updated product price. As we are using price slider-Min - Max price is also not correct.

I have debugged a lot and here is my findings

Min-max price is calculating from product collection by using following methods.

$productCollection->getMinPrice();

$productCollection->getMaxPrice();

Product collections we are getting on product list page is not including the customised price. I think, if we set customised price to product collection then price thing will work fine.

Here is plugin which I am using to customise price.

1.etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<type name="Magento\Catalog\Pricing\Price\RegularPrice">
    <plugin name="product_price_change"
            type="Namespace\Modulename\Plugin\Updateprice"
            sortOrder="1"/>
</type>
</config>

2.Plugin/Updateprice.php

<?php
namespace Namespace\Modulename\Plugin;

class Updateprice
{
    public function afterGetValue(\Magento\Catalog\Pricing\Price\RegularPrice $subject, $result) {
        
        return $result + $myCustomPriceCharges;

    }
}

Any suggestion would be appreciated. Thanks

Answer 1

You are right the functions getMinPrice() and getMaxPrice in \Magento\Catalog\Model\ResourceModel\Product\Collection class will need to be updated to include the custom charges.

You can write your own implementation of those methods by utilizing di.xml. However, I suspect you will have to implement codes to change the behaviors of more classes to make this work entirely (I don't know for sure but likely that the indexers class).

Also, consider how promotional rules work with your setup. Tax calculation is another area to look into.

Alternatively, I'd suggest that you make your price inclusive of customs charges. In your template, you can display the product price as the + custom charge amount (presumably the customs charge is stored in a product attribute).

So for example if product A price is $80 + $20. It is easier to store A's price as $100 and modify your template to display:

$priceBefore = $product->getPrice() - $product->getCustomCharge();

Hope this helps.

Answer 2

Add in di.xml

<config>
  <type name="Magento\Catalog\Model\Product">
    <plugin name="change_product" type=" Vendor\Module\Plugin\Product " />
  </type>
</config>

create file in Vendor\Module\Plugin\Product.php

<?php

namespace Vendor\Module\Plugin;

class Product
{
    public function afterGetPrice(\Magento\Catalog\Model\Product $subject, $result)
    {
        customPrice=10;  
        return $result*$customPrice;
    }
}

Answer 3

If you only need to adjust the layered navigation price filter and all your products have the extra custom charge, you can create a plugin to add your custom charge to the getMinPrice() and getMaxPrice() methods.

You do that the same way you added it to the regular price.

.../etc/di.xml

<type name="Magento\Catalog\Model\ResourceModel\Product\Collection">
    <plugin name="adjust_collection_min_max_price" type="{Vendor}\{Module}\Plugin\Model\ResourceModel\Product\Collection" />
</type>

.../Plugin/Model/ResourceModel/Product/Collection.php

<?php
namespace Vendor\Module\Plugin\Model\ResourceModel\Product;
class Collection
{
    public function afterGetMinPrice(\Magento\Catalog\Model\ResourceModel\Product\Collection $subject, $result) {

        return $result + $myCustomPriceCharges;

    }

    public function afterGetMaxPrice(\Magento\Catalog\Model\ResourceModel\Product\Collection $subject, $result) {

        return $result + $myCustomPriceCharges;

    }
}

If only some of your products have the extra charge, then the above won't work correctly for products that don't have the charge.

In this case you should consider alternative approaches instead of plugins.

For example: Catalog -> Products -> Custom Options -> Add a required option that adds the extra charge only to products that should have your extra charge.