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Moderators: martimiz, Nicolaas, Sean, Ed, frankmullenger, biapar, Willr, Ingo, Jedateach, swaiba

Help with super simple OrderModifier

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2 Posts   850 Views


Community Member, 22 Posts

16 March 2012 at 9:42pm

Hey all,

Firstly, thanks for all the hard work everyone has been doing on the cart! looking great!

Please help.

All I want to do is create a custom Modifier that does nothing more than add $10 to the order Total. I dont need any ModifierForms etc etc... just add $10 to the total
I know, I know... this should be easy... I have the following:

class ModifierExample extends OrderModifier {

protected function LiveName() {
return "Test";

protected function LiveCalculatedTotal() {
return 10;

public function LiveTableValue() {
return $this->LiveCalculatedTotal();


and added correct line to _config

But i get the following error going to the checkout page:
[User Error] While the order can be edited, you must call the runUpdate method everytime you get the details for this modifier

Sessions cleared dev/build etc etc all done..
Sorry if I'm completely missing something stupid here... it's driving me nuts! Thanks in advance


Forum Moderator, 238 Posts

26 March 2012 at 1:15pm

Edited: 26/03/2012 1:16pm

Hi nimesodelta,

In the latest version of shop, this should be enough:

class ModifierExample extends OrderModifier {
    function value() {
        return 10;

...not tested though.