Rails - Jul 2012 - Rails3-default_scope throws exception: undefined method abstract_class? for Object:Class

I would like to apply logical delete in my application(Instead of 
permanently deleting a record just have been marked as deleted). I have 
Added *available* column to all tables with default value *true*. Now I 
want common place to write the following code for all models.


   1. 
   
   Write the instance method which make ''available'' column
value false when user clicks on destroy link.
   
   2. 
   
   Merge the ''available=true'' condition to all
ActiveRecord''s queries while fetching the records.
   
   
With reference Rails extending
ActiveRecord::Base<http://stackoverflow.com/questions/2328984/rails-extending-activerecordbase>,
I decided to use monkey patch to do above. Created monkey patch file in 
config/initializer/active_record_patch.rb:

class ActiveRecord::Base
   def inactive
      update_attribute(:available, false)
   end

   default_scope :available => true
end

Getting following error when add the default_scope

*/gems/ruby-1.9.2-p290/gems/activerecord-3.0.9/lib/active_record/base.rb:1212:in
class_of_active_record_descendant'': undefined
methodabstract_class?'' for
Object:Class (NoMethodError)*


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