Checkout API endpoints fails when updating an order with a shipping address

[jsilland]

This is happening on a reasonably vanilla install of Spree 2.4, where spree_multi_currency 2.4-stable installed — the one customization that we have made and seems to be relevant in this case is that we set the session[:currency] field for each request based on the request's IP address, including for API requests.

The problem is relatively easy to track down:

• CurrencyHelpers is included in ApplicationController by the SpreeMultiCurrency::Engine class in order to provide the supported_currencies method.
• Separately, Spree::Core::ControllerHelpers::Order is augmented by a decorator in this gem to intercept the current_currency method and validate that it belongs to the supported_currencies available from every controller.
• As it turns out, Spree::Api::CheckoutsController includes Spree::Core::ControllerHelpers::Order but does not have the supported_currencies method available, because it isn't a subclass of ApplicationController — API controllers inherit from ActionController::Base.

Proposed solution (that we are likely going to go with on our end) is to include the CurrencyHelpers in the Spree::Api::BaseController

[mdavo6]

Thanks @jsilland , your notes were very helpful. 👍