gistfile1.rb

# In my Image Bank Rails App 
class Payment < ActiveRecord::Base
  default_scope :conditions => { :application => 'ImageBank' }
  before_save { |p| p.application="ImageBank"  }
end

# In my Live Performances Rails App 
class Payment < ActiveRecord::Base
  default_scope :conditions => { :application => 'LivePerformances' }
  before_save { |p| p.application="LivePerformances"  }
end