Refresh products cache when taxons or classifications are changed or destroyed

app/models/spree/classification_decorator.rb

@@ -1,6 +1,15 @@
 Spree::Classification.class_eval do
   belongs_to :product, :class_name => "Spree::Product", touch: true
+  after_save :refresh_products_cache
   before_destroy :dont_destroy_if_primary_taxon
+  after_destroy :refresh_products_cache
+
+
+  private
+
+  def refresh_products_cache
+    product.refresh_products_cache
+  end
 
   def dont_destroy_if_primary_taxon
     if product.primary_taxon == taxon

app/models/spree/taxon_decorator.rb

@@ -1,7 +1,12 @@
 Spree::Taxon.class_eval do
+  has_many :classifications, :dependent => :destroy
+
+
   self.attachment_definitions[:icon][:path] = 'public/images/spree/taxons/:id/:style/:basename.:extension'
   self.attachment_definitions[:icon][:url] = '/images/spree/taxons/:id/:style/:basename.:extension'
 
+  after_save :refresh_products_cache
+
 
   # Indicate which filters should be used for this taxon
   def applicable_filters
@@ -45,4 +50,11 @@ Spree::Taxon.class_eval do
 
     taxons
   end
+
+
+  private
+
+  def refresh_products_cache
+    products(:reload).each &:refresh_products_cache
+  end
 end