Exclude canceled orders in promotion #usage_count

This allows for a more accurate count of promotion/promotion_code usage.

The exclusion was kept as an optional boolean within`Adjustment`
`#in_completed_orders` to keep backward compatibility and allow
 for canceled orders to be excluded within a single query when required.

core/app/models/spree/adjustment.rb

@@ -55,11 +55,12 @@ class Adjustment < Spree::Base
     #
     # @param excluded_orders [Array<Spree::Order>] Orders to exclude from query
     # @return [ActiveRecord::Relation] Scoped Adjustments
-    def self.in_completed_orders(excluded_orders: [])
-      joins(:order).
-      merge(Spree::Order.complete).
-      where.not(spree_orders: { id: excluded_orders }).
-      distinct
+    def self.in_completed_orders(excluded_orders: [], exclude_canceled: false)
+      result = joins(:order)
+               .merge(Spree::Order.complete)
+               .where.not(spree_orders: { id: excluded_orders })
+               .distinct
+      exclude_canceled ? result.merge(Spree::Order.not_canceled) : result
     end
 
     def finalize!

core/app/models/spree/promotion.rb

@@ -192,7 +192,7 @@ def usage_limit_exceeded?(excluded_orders: [])
     def usage_count(excluded_orders: [])
       Spree::Adjustment.promotion.
         eligible.
-        in_completed_orders(excluded_orders: excluded_orders).
+        in_completed_orders(excluded_orders: excluded_orders, exclude_canceled: true).
         where(source_id: actions).
         count(:order_id)
     end

core/app/models/spree/promotion_code.rb

@@ -30,7 +30,7 @@ def usage_limit_exceeded?(excluded_orders: [])
   def usage_count(excluded_orders: [])
     adjustments.
     eligible.
-    in_completed_orders(excluded_orders: excluded_orders).
+    in_completed_orders(excluded_orders: excluded_orders, exclude_canceled: true).
     count(:order_id)
   end
 

core/spec/models/spree/promotion_code_spec.rb

@@ -147,6 +147,11 @@
         before { order.adjustments.promotion.update_all(eligible: false) }
         it { is_expected.to eq 0 }
       end
+      context "and the order is canceled" do
+        before { order.cancel! }
+        it { is_expected.to eq 0 }
+        it { expect(order.state).to eq 'canceled' }
+      end
     end
   end
 

core/spec/models/spree/promotion_spec.rb

@@ -386,6 +386,11 @@
         before { order.adjustments.promotion.update_all(eligible: false) }
         it { is_expected.to eq 0 }
       end
+      context "and the order is canceled" do
+        before { order.cancel! }
+        it { is_expected.to eq 0 }
+        it { expect(order.state).to eq 'canceled' }
+      end
     end
   end