diff --git a/app/models/post.rb b/app/models/post.rb
index 36b36e2..e3ada41 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -75,10 +75,21 @@ class Post < OpenStruct
     'posts/' + uuid.value
   end
 
+  def cache_version
+    updated_at.utc.to_s(:usec)
+  end
+
+  # Agregar el timestamp para saber si cambió, siguiendo el módulo
+  # ActiveRecord::Integration
+  def cache_key_with_version
+    cache_key + '-' + cache_version
+  end
+
   # TODO: Convertir a UUID?
   def id
     path.basename
   end
+  alias to_param id
 
   def updated_at
     File.mtime(path.absolute)