WIP: Delete ExchangeVariants when product is soft-deleted

app/models/spree/product_decorator.rb

@@ -147,6 +147,13 @@ Spree::Product.class_eval do
     end
   end
 
+  def delete_with_delete_from_order_cycles
+    delete_without_delete_from_order_cycles
+
+    ExchangeVariant.where('exchange_variants.variant_id IN (?)', self.variants_including_master_and_deleted).destroy_all
+  end
+  alias_method_chain :delete, :delete_from_order_cycles
+
 
   private
 

spec/models/spree/product_spec.rb

@@ -580,7 +580,7 @@ module Spree
       end
     end
 
-    describe "Taxons" do
+    describe "taxons" do
       let(:taxon1) { create(:taxon) }
       let(:taxon2) { create(:taxon) }
       let(:product) { create(:simple_product) }
@@ -589,5 +589,25 @@ module Spree
         product.taxons.should == [product.primary_taxon]
       end
     end
+
+    describe "deletion" do
+      let(:p) { create(:simple_product) }
+      let(:v) { create(:variant, product: p) }
+      let(:oc) { create(:simple_order_cycle) }
+      let(:s) { create(:supplier_enterprise) }
+      let(:e) { create(:exchange, order_cycle: oc, incoming: true, sender: s, receiver: oc.coordinator) }
+
+      it "removes the master variant from all order cycles" do
+        e.variants << p.master
+        p.delete
+        e.variants(true).should be_empty
+      end
+
+      it "removes all other variants from order cycles" do
+        e.variants << v
+        p.delete
+        e.variants(true).should be_empty
+      end
+    end
   end
 end