#update_column(s) skips callbacks (which is useful), but it doesn't change the updated_at field on the record by default (which we should be doing in these cases).
This change is made in Spree 2.2 here: b367c629ce
Fixes#6435 i.e. If the customer paid for their order by Stripe/Paypal then the Enterprise needs to know that the order was cancelled in order to arrange a refund. Refunds are not automatically processed when an order is cancelled.
This will send a very basic email to the shop, it only includes a link to view the cancelled order in the admin area initially.
I created a CustomerOrderCancellation object here because orders can be cancelled in two ways (1) by the customer, so an email should be sent to the shop. (2) by the shop, so an email doesn't need to be sent. However the code for cancelling order happens in Order#cancel via the state machine. Rather than passing some sort of parameter into #cancel to indicate whether it is a customer or shop cancelled order it might be clearer to have a CustomerOrderCancellation object, there could be other differences between customer or shop cancelled orders in future maybe.
Instead of relying on Spree::Order#outstanding_balance we make us of the
result set `balance_value` computed column. So, we ask PostgreSQL to
compute it instead of Ruby and then serialize it from that computed
column. That's a bit faster to compute that way and let's reuse logic.
We hide this new implementation under this features' toggle so it's only
used when enabled. We want hit the old behaviour by default.
If an admin changes the amount on a tax rate, and that rate has been used by adjustments in the past, we need to soft-delete and clone it to preserve the data integrity of previous adjustments that were created using that rate.
I'm not sure why this spec started failing. Fixes:
```
Spree::OrdersController viewing cart when an item is in the cart the page provides the right registration path
Failure/Error: expect(subject.registration_path).to eq registration_path
ActionController::UrlGenerationError:
No route matches {:action=>"index", :controller=>"registration"}
# ./spec/controllers/spree/orders_controller_spec.rb:140:in `block (5 levels) in <top (required)>'
```
