Refresh cache when option type changed

app/models/spree/option_type_decorator.rb

@@ -0,0 +1,13 @@
+module Spree
+  OptionType.class_eval do
+    has_many :products, through: :product_option_types
+    after_save :refresh_products_cache
+
+
+    private
+
+    def refresh_products_cache
+      products(:reload).each &:refresh_products_cache
+    end
+  end
+end

spec/models/spree/option_type_spec.rb

@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+module Spree
+  describe OptionType do
+    describe "products cache" do
+      let!(:product) { create(:simple_product, option_types: [option_type]) }
+      let(:option_type) { create(:option_type) }
+
+      before { option_type.reload }
+
+      it "refreshes the products cache on change, via product" do
+        expect(OpenFoodNetwork::ProductsCache).to receive(:product_changed).with(product)
+        option_type.name = 'foo'
+        option_type.save!
+      end
+
+      # When a OptionType is destroyed, the destruction of the OptionValues refreshes the cache
+    end
+  end
+end