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I want to add a new filter Discount on category page. It's values will be something like

0-10 %
11-20 %
21-30 %

I do not want to import the values of discount attribute with product import which is a manual process. Instead I want to make it dynamic.

Example: If products base price is 100 and special price is 90, product should be shown in 0-10 % discount filter.

Can you please share your thoughts about how to achieve it?

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I hope its useful to you, try with this code.

1) create one attribute of type "dropdown" as discount_percentage.

2) assign attribute to the product attribute set

3) now for calculation of the product discount you can try using observer called catalog_product_save_before with following code in observer.php

public function catalog_product_save_before($observer)
{
    $product = $observer->getProduct();
    $product_price = $product->getPrice();
    $product_sp_price = $product->getSpecialPrice();
    $discount_percentage = ($product_sp_price/$product_price)*100;
    $product->setDiscountPercentage($discount_percentage);
    $product->save();
}

Note :- before discount is assiging to product the that option should be created previously.for example if the discount is 30% the discount option 30% should be their before or else you have to look how to create this options to dropdown attributes programmatically

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