Better

Author: bf4

lib/active_model_serializers/model.rb

@@ -17,21 +17,22 @@ def self.attributes(*names)
       self.attribute_names = attribute_names | names.map(&:to_sym)
     end
 
-    attributes :id, :cache_key, :updated_at
+    attributes :id
+    attr_accessor :updated_at, :cache_key
 
     # Defaults to the downcased model name.
     def id
-      (@id ||= nil) || self.id = self.class.name.downcase
+      (@id ||= nil) || self.class.name.downcase
     end
 
     # Defaults to the downcased model name and updated_at
     def cache_key
-      (@cache_key ||= nil) || self.cache_key = "#{self.class.name.downcase}/#{id}-#{updated_at.strftime('%Y%m%d%H%M%S%9N')}"
+      (@cache_key ||= nil) || "#{self.class.name.downcase}/#{id}-#{updated_at.strftime('%Y%m%d%H%M%S%9N')}"
     end
 
     # Defaults to the time the serializer file was modified.
     def updated_at
-      (@updated_at ||= nil) || self.updated_at = File.mtime(__FILE__)
+      (@updated_at ||= nil) || File.mtime(__FILE__)
     end
 
     attr_reader :errors