Where is the setCouponCode function is defined in Magento

Question

I know that setCouponCode is catch inside __call in Varien_Object but I can't figure out where it is defined.

I need it because I want to show the coupon code even if the discount equal zero. I believed it's done inside this function.

So if anybody know where the function is defined or where I can modify the code to get the coupon code displayed all the time, please let me know.

Answer 1

Most text editors have a 'search in files/folders' option. Open the source folder and search for function __setCouponCode.

Answer 2

Ok I figured it out. the SetCouponCode is setting the value for coupon_code in the magic function.