some real models

app/main/models/blocks_model.rb

@@ -0,0 +1,8 @@
+class BlocksModel < Volt::ArrayModel
+
+  def instruction_changed old , ins
+    self.last._class_name = "" if( page._blocks.length > 0)
+    self << { :name => ins.to_s , :class_name => "active" }
+  end
+
+end