namespace impressionable model module class methods with 'impressionist_'

lib/impressionist/models/active_record/impression.rb

@@ -10,7 +10,7 @@ class Impression < ActiveRecord::Base
   def update_impressions_counter_cache
     impressionable_class = self.impressionable_type.constantize
 
-    if impressionable_class.counter_cache_options
+    if impressionable_class.impressionist_counter_cache_options
       resouce = impressionable_class.find(self.impressionable_id)
       resouce.try(:update_counter_cache)
     end

lib/impressionist/models/active_record/impressionist/impressionable.rb

@@ -5,7 +5,7 @@ module Impressionist
     module ClassMethods
       def is_impressionable(options={})
         has_many :impressions, :as => :impressionable, :dependent => :destroy
-        @cache_options = options[:counter_cache]
+        @impressionist_cache_options = options[:counter_cache]
       end
     end
   end