gist: 125595


  
      ddd.rb
    
    
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              class PersistenceLayer
  # methods that make saving happen
end
 
class Gadget
  # domain behavior
end
 
g = Gadget.new
g.persistance_proxy = PersistenceLayer.new
 
g.persistance_proxy.write
 
# or class level
 
PersistenceLayer.write(g)
 
            
      modular.rb
    
    
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              module PersistenceLayer
  # methods that make saving happen
end
 
class Gadget
  # domain behavior
  include PersistenceLayer
end
 
g = Gadget.new
g.write