I'm looking in the source code of the Checkout controller (https://github.com/spree/spree/blob/0-60-stable/core/app/controllers/checkout_controller.rb) and didn't find the edit action there. Where is it defined?
The CheckoutController has an implied edit action. There's no direct logic for edit itself.
There is however the before_filter :load_order which in turn triggers a before_[state] callback method, depending on which state the checkout is in.
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