Find properties of items sold by a shop

app/models/spree/property_decorator.rb

@@ -6,6 +6,13 @@ module Spree
         where('spree_product_properties.product_id IN (?)', enterprise.supplied_product_ids)
     }
 
+    scope :sold_by, ->(shop) {
+      joins(products: {variants: {exchanges: :order_cycle}}).
+        merge(Exchange.outgoing).
+        merge(Exchange.to_enterprise(shop)).
+        merge(OrderCycle.active)
+    }
+
     after_save :refresh_products_cache
 
     # When a Property is destroyed, dependent-destroy will destroy all ProductProperties,

spec/models/spree/property_spec.rb

@@ -30,6 +30,45 @@ module Spree
           expect(Spree::Property.applied_by(producer).to_a.count).to eq 1
         end
       end
+
+      describe ".sold_by" do
+        let!(:shop) { create(:distributor_enterprise) }
+        let!(:shop_other) { create(:distributor_enterprise) }
+        let!(:product) { create(:simple_product) }
+        let!(:product_other_ex) { create(:simple_product) }
+        let!(:product_no_oc) { create(:simple_product) }
+        let!(:product_closed_oc) { create(:simple_product) }
+        let!(:oc) { create(:simple_order_cycle, distributors: [shop], variants: [product.variants.first]) }
+        let!(:oc_closed) { create(:closed_order_cycle, distributors: [shop], variants: [product_closed_oc.variants.first]) }
+        let!(:exchange_other_shop) { create(:exchange, order_cycle: oc, sender: oc.coordinator, receiver: shop_other, variants: [product_other_ex.variants.first]) }
+        let(:property) { product.properties.last }
+        let(:property_other_ex) { product_other_ex.properties.last }
+        let(:property_no_oc) { product_no_oc.properties.last }
+        let(:property_closed_oc) { product_closed_oc.properties.last }
+
+        before do
+          product.set_property 'Organic', 'NASAA 12345'
+          product_other_ex.set_property 'Biodynamic', 'ASDF 12345'
+          product_no_oc.set_property 'Shiny', 'Very'
+          product_closed_oc.set_property 'Spiffy', 'Ooh yeah'
+        end
+
+        it "returns the property" do
+          expect(Property.sold_by(shop)).to eq [property]
+        end
+
+        it "doesn't return the property from another exchange" do
+          expect(Property.sold_by(shop)).not_to include property_other_ex
+        end
+
+        it "doesn't return the property with no order cycle" do
+          expect(Property.sold_by(shop)).not_to include property_no_oc
+        end
+
+        it "doesn't return the property from a closed order cycle" do
+          expect(Property.sold_by(shop)).not_to include property_closed_oc
+        end
+      end
     end
 
     describe "callbacks" do