Generalise fix for missing EnterpriseFee::Calculator to any use of calculated_adjustments

app/models/enterprise_fee.rb

@@ -16,9 +16,6 @@ class EnterpriseFee < ActiveRecord::Base
 
   calculated_adjustments
 
-  # Class name is mis-inferred outside of Spree namespace
-  has_one   :calculator, as: :calculable, dependent: :destroy, class_name: 'Spree::Calculator'
-
 
   attr_accessible :enterprise_id, :fee_type, :name, :tax_category_id, :calculator_type, :inherits_tax_category
 

config/initializers/spree.rb

@@ -8,6 +8,7 @@
 
 
 require 'spree/product_filters'
+require 'spree/core/calculated_adjustments_decorator'
 
 require "#{Rails.root}/app/models/spree/payment_method_decorator"
 require "#{Rails.root}/app/models/spree/gateway_decorator"

lib/spree/core/calculated_adjustments_decorator.rb

@@ -0,0 +1,14 @@
+module Spree
+  module Core
+    module CalculatedAdjustments
+      module ClassMethods
+        def calculated_adjustments_with_explicit_class_name
+          calculated_adjustments_without_explicit_class_name
+          # Class name is mis-inferred outside of Spree namespace
+          has_one :calculator, as: :calculable, dependent: :destroy, class_name: 'Spree::Calculator'
+        end
+        alias_method_chain :calculated_adjustments, :explicit_class_name
+      end
+    end
+  end
+end

spec/lib/open_food_network/enterprise_fee_applicator_spec.rb

@@ -1,3 +1,4 @@
+require 'spec_helper'
 require 'open_food_network/enterprise_fee_applicator'
 
 module OpenFoodNetwork