Magento – Maximum discount percent magento

discountmagento-1.9shopping-cart-price-rules

How to configure the maximum discount percent in magento for the cart amount.

Example: Cart value is 3,50,000

Coupon Code discount applicable : 20%

Discount applicable 70,000

However I want to limit this to 50,000 only.

Best Answer

Surprisingly, this is not possible in the Magento 1.x without an extension or code modification.

To add this feature in our module we had to:

1) add a new field max_discount in the table salesrule

2) observe event salesrule_validator_process

        <salesrule_validator_process>
        <observers>
            <amasty_rules_model_observer>
                <type>singleton</type>
                <class>amrules/observer</class>
                <method>handleValidation</method>
            </amasty_rules_model_observer>
        </observers>
        </salesrule_validator_process>

3) keep track of all discounts given to item by rule_id (just remember them in a variable)

protected function _limitMaxDiscount($r, $rule, $itemId, $quote)
{
    if ($rule->getMaxDiscount()==0) {
        return $r[$itemId];
    }
    if (isset($this->_ruleDiscount[$rule->getId()])) {
        $this->_ruleDiscount[$rule->getId()]['base_discount'] += $r[$itemId]['base_discount'];
    } else {
        $this->_ruleDiscount[$rule->getId()]['base_discount'] = $r[$itemId]['base_discount'];
    }
    if ($this->_ruleDiscount[$rule->getId()]['base_discount'] > $rule->getMaxDiscount()) {
        $r[$itemId]['base_discount'] = $r[$itemId]['base_discount'] - ($this->_ruleDiscount[$rule->getId()]['base_discount'] - $rule->getMaxDiscount());
        $r[$itemId]['discount'] = $quote->getStore()->convertPrice(
            $r[$itemId]['base_discount']
        );
    }
    return $r[$itemId];
}

4) when apply next discount to an item, check if it is in the range.

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