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When creating a comment on Spree 3.7.0 and Rails 5.2.3, you will receive a :back method not found error from the location_after_save method in the admin/comments_controller.rb because :back was deprecated in Rails 5.
Changing the :back method to a more universal way of getting back to the last page (request.referrer) cleared up the issue. This should also work for previous versions of Rails before the :back method was deprecated.