Method deprecation using method_missing

methodMissingDeprecation.rb

class Myclass
  @@old_methods = { oldMethod1: :new_method1, oldMethod2: :new_method2 }
  
  def new_method1
    'Myclass#new_method1'
  end
  
  def new_method2
    'Myclass#new_method2'
  end
  
  def method_missing(name, *args, &block)
    super unless @@old_methods.keys.include?(name.to_sym)
    warn "WARNING : #{name} will be deprecated with next release dated 09/01/2017"
    send(@@old_methods[name.to_sym])
  end
  
end


obj = Myclass.new
# => #<Myclass:0x0000000271c288> 
obj.oldMethod1
#WARNING : oldMethod1 will be deprecated with next release dated 09/01/2017
# => "Myclass#new_method1" 
obj.new_method1
# =>"Myclass#new_method1" 
obj.oldMethod2
#WARNING : oldMethod2 will be deprecated with next release dated 09/01/2017
# => "Myclass#new_method2" 
obj.non_existant_method
#NoMethodError: undefined method `non_existant_method' for #<Myclass:0x0000000271c288>