Refresh cache when option value changed or destroyed

app/models/spree/option_value_decorator.rb

@@ -0,0 +1,20 @@
+module Spree
+  OptionValue.class_eval do
+    after_save :refresh_products_cache
+    around_destroy :refresh_products_cache_from_destroy
+
+
+    private
+
+    def refresh_products_cache
+      variants(:reload).each &:refresh_products_cache
+    end
+
+    def refresh_products_cache_from_destroy
+      vs = variants(:reload).to_a
+      yield
+      vs.each &:refresh_products_cache
+    end
+
+  end
+end

spec/models/spree/option_value_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+module Spree
+  describe OptionValue do
+    describe "products cache" do
+      let(:variant) { create(:variant) }
+      let(:option_value) { create(:option_value) }
+
+      before do
+        variant.option_values << option_value
+        option_value.reload
+      end
+
+      it "refreshes the products cache on change, via variant" do
+        expect(OpenFoodNetwork::ProductsCache).to receive(:variant_changed).with(variant)
+        option_value.name = 'foo'
+        option_value.save!
+      end
+
+      it "refreshes the products cache on destruction, via variant" do
+        expect(OpenFoodNetwork::ProductsCache).to receive(:variant_changed).with(variant)
+        option_value.destroy
+      end
+    end
+  end
+end