Remove code that guesses what the tax rate might be

🎉

app/controllers/spree/admin/adjustments_controller.rb

@@ -9,7 +9,6 @@ module Spree
       before_action :set_order_id, only: [:create, :update]
       before_action :skip_changing_canceled_orders, only: [:create, :update]
       after_action :update_order, only: [:create, :update, :destroy]
-      before_action :set_default_tax_rate, only: :edit
 
       private
 
@@ -42,34 +41,6 @@ module Spree
         redirect_to admin_order_adjustments_path(@order) if @order.canceled?
       end
 
-      # Choose a default tax rate to show on the edit form. The adjustment stores its included
-      # tax in dollars, but doesn't store the source of the tax (ie. TaxRate that generated it).
-      # We guess which tax rate here, choosing:
-      # 1. A tax rate that will compute to the same amount as the existing tax
-      # 2. If that's not present, the first tax rate that's valid for the current order
-      # When we have to go with 2, we show an error message to ask the admin to check that the
-      # correct tax is being applied.
-      def set_default_tax_rate
-        return if @adjustment.included_tax <= 0
-
-        tax_rates = TaxRate.match(@order)
-        tax_rate_with_matching_tax = find_tax_rate_with_matching_tax(tax_rates)
-        tax_rate_valid_for_order = tax_rates.first.andand.id
-
-        @tax_rate_id = tax_rate_with_matching_tax || tax_rate_valid_for_order
-
-        return unless tax_rate_with_matching_tax.nil?
-
-        @adjustment.errors.add :tax_rate_id, I18n.t(:adjustments_tax_rate_error)
-      end
-
-      def find_tax_rate_with_matching_tax(tax_rates)
-        tax_rates_yielding_matching_tax = tax_rates.select do |tr|
-          tr.compute_tax(@adjustment.amount) == @adjustment.included_tax
-        end
-        tax_rates_yielding_matching_tax.first.andand.id
-      end
-
       def set_included_tax
         included_tax = 0
         if params[:tax_rate_id].present?