first version of tag cloud.

app/models/tag.rb

@@ -1,10 +1,28 @@
 class Tag
-  
   include Mongoid::Document
   include Mongoid::Timestamps
+  include Impressionist::Impressionable
   
+  is_impressionable :counter_cache => { :column_name => :view_count }
   field :key
-
+  #field :cloud_amper,:type: Integer,:default=> 0 
   belongs_to :module_app
   
+  def cloud_amper
+    for_now = {:start_at=>20.days.ago,:end_at=>Time.now}
+    for_yesterday = {:start_at=>19.days.ago,:end_at=>1.days.ago}
+
+    range = self.class.all.collect{ |tag|
+      get_impressionist_diff(tag)
+    }
+    (get_impressionist_diff - range.min).abs
+  end
+
+protected
+  def get_impressionist_diff(item_tag = self)
+      for_now = item_tag.impressionist_count(:start_date=>20.days.ago,:end_date=>Time.now)
+      for_yesterday = item_tag.impressionist_count(:start_date=>21.days.ago,:end_date=>1.days.ago)
+      for_now - for_yesterday
+  end
+
 end