This module relies on class `ShippingFrameworkModifier` existing

[jameshoward]

If I install the discount module on a base shop install I get the following notice:

Modifier class "ShippingFrameworkModifier" does not exist.

I've tracked this down to Shop\Discount\Calculator line 92:

if($shipping = $this->order->getModifier("ShippingFrameworkModifier")){

In Order::getModifier there's a ClassInfo::exists check that's throwing the user_error because that class doesn't exist.

Either there's a dependency on silverstripe-shop-shipping or a better way of determining if the order has that modifier without needing the class to exist.

[markguinn]

Good catch, @jameshoward. I've run into that before as well. Just created pull request #35. Assuming it passes CI I'll merge it today. @jedateach I don't think we want to require the shipping framework do we?

[jameshoward]

Two potential solutions I can think of:

1. Change getModifier so it returns NULL rather than throwing an error. Without knowing where else this method is called from, I can't tell if this actually breaks more than it solves.
2. Implement a hasModifier method. This could do a couple of lazy checks first:

// Lazy checks for class existing and order having modifiers.
if (!ClassInfo::exists($className) || ($this->order->Modifiers()->count() == 0)) {
    return false;
}

// Check whether the order has the modifier...

[jameshoward]

Or your 3rd option in #35 that looks much less risky! :)

[markguinn]

@jedateach it's worth thinking about #1 above as a fix in the shop module itself.

[markguinn]

35 is merged

[wilr]

This has been resolved.

[isaac-at-room9]

How long until this is released? We're using this module and it has been over a year since anything was released. Ran into this issue today with the latest release, had to fix the package at a commit (not preferable)

[wilr]

@isaac-at-room9 Tagged a 1.2.0 release.

[isaac-at-room9]

@wilr oh, i must've missed that one when I first installed the package... I can't see it on https://packagist.org/packages/silvershop/discounts