Magento 1.9.4 - Plugin recommedation for changing category prices

Question

Good morning,

i need a module to change all product prices for a specific category.

Example: I want to increase / decrease the product prices for all articles of the category "towel" by 2% or 3,5€.

I didnt find a module that helps me doing it (Magento v. 1.9.4).

I was also looking for catalog price rules. Maybe someone can tell me how to modifiy the discount field, so i can enter negative discount values to add a price. In that case the discount should not shown in the shop, because it doesnt make sense to show a discount that value is higher than the original...

I hope someone can help me.

kind regards Chris

Answer 1

Magento doesn't accept negative discounts, i.e. price increases using catalog price rules. If you want to change this logic in your magento installation, you have to customize the Mage_CatalogRule_Model_Rule model and overwrite the _beforeSave() method (it is inherited from Mage_Rule_Model_Abstract):

Just remove the following code within that method:

 // Check if discount amount not negative
    if ($this->hasDiscountAmount()) {
        if ((int)$this->getDiscountAmount() < 0) {
            Mage::throwException(Mage::helper('rule')->__('Invalid discount amount.'));
        }
    }

Regarding what is displayed in your templates you might have to make some changes dependig on your theme / customizations etc. In Magentos default price template I guess you are safe regarding the display of a discount when your finalPrice is higher than the regular price.

I hope that helps.