diff --git a/app/controllers/spree/admin/adjustments_controller_decorator.rb b/app/controllers/spree/admin/adjustments_controller.rb
similarity index 57%
rename from app/controllers/spree/admin/adjustments_controller_decorator.rb
rename to app/controllers/spree/admin/adjustments_controller.rb
index a45e3b4859..07a9207c14 100644
--- a/app/controllers/spree/admin/adjustments_controller_decorator.rb
+++ b/app/controllers/spree/admin/adjustments_controller.rb
@@ -1,12 +1,23 @@
 module Spree
   module Admin
-    AdjustmentsController.class_eval do
+    class AdjustmentsController < ResourceController
+      belongs_to 'spree/order', find_by: :number
+      destroy.after :reload_order
+
       prepend_before_filter :set_included_tax, only: [:create, :update]
       before_filter :set_default_tax_rate, only: :edit
       before_filter :enable_updates, only: :update
 
       private
 
+      def reload_order
+        @order.reload
+      end
+
+      def collection
+        parent.adjustments.eligible
+      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:
@@ -15,28 +26,34 @@ module Spree
       # 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
-        if @adjustment.included_tax > 0
-          trs = TaxRate.match(@order)
-          tr_yielding_matching_tax = trs.select { |tr| tr.compute_tax(@adjustment.amount) == @adjustment.included_tax }.first.andand.id
-          tr_valid_for_order = TaxRate.match(@order).first.andand.id
+        return if @adjustment.included_tax <= 0
 
-          @tax_rate_id = tr_yielding_matching_tax || tr_valid_for_order
+        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
 
-          if tr_yielding_matching_tax.nil?
-            @adjustment.errors.add :tax_rate_id, I18n.t(:adjustments_tax_rate_error)
-          end
+        @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?
           tax_rate = TaxRate.find params[:tax_rate_id]
           amount = params[:adjustment][:amount].to_f
-          params[:adjustment][:included_tax] = tax_rate.compute_tax amount
-
-        else
-          params[:adjustment][:included_tax] = 0
+          included_tax = tax_rate.compute_tax amount
         end
+        params[:adjustment][:included_tax] = included_tax
       end
 
       # Spree 2.0 keeps shipping fee adjustments open unless they are manually
diff --git a/config/routes/spree.rb b/config/routes/spree.rb
index 72d43d90ec..bf06735bb7 100644
--- a/config/routes/spree.rb
+++ b/config/routes/spree.rb
@@ -74,6 +74,8 @@ Spree::Core::Engine.routes.prepend do
           get :poll
         end
       end
+
+      resources :adjustments
     end
 
     resources :users do