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Ruby Metaprogramming - Subclass a Method with Before/After Callbacks and alias_method

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  1. require 'rubygems'
  2. require 'active_model'
  3.  
  4. class BaseModel
  5.   extend ActiveModel::Callbacks
  6.  
  7.   define_model_callbacks :save
  8.   before_save { puts "[save:before]"}
  9.   after_save { puts "[save:after]"}
  10.  
  11.   def do_save; end
  12.   def save
  13.     _run_save_callbacks do
  14.       do_save
  15.     end
  16.   end
  17.   alias_method :superclass_save, :save
  18. end
  19.  
  20. class SomeModel < BaseModel
  21.   def save
  22.     puts "[saving...]"
  23.     true
  24.   end
  25. end
  26.  
  27. SomeModel.class_eval do
  28.   alias_method :subclass_save, :save
  29.   alias_method :do_save, :subclass_save
  30.   alias_method :save, :superclass_save
  31. end
  32.  
  33. model = SomeModel.new
  34. model.save

URL: ruby-metaprogramming-subclass-a-method-with-before-after-callbacks-and-alias-method

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