tourist_irb_session_1.rb

wesbailey@feynman:~> irb
ruby-1.9.2-p0 > class NeverWriteCodeLikeThis
ruby-1.9.2-p0 ?>    @@actions = ["create", "retrieve", "update"]
ruby-1.9.2-p0 ?>  
ruby-1.9.2-p0 >       def initialize(val)
ruby-1.9.2-p0 ?>        @@actions.each do |m|                                  # ["create", "retrieve", "update"].each do |m|
ruby-1.9.2-p0 >               instance_variable_set("@#{m}_process".to_sym, val)   #   instance_variable_set("@create_process".to_sym, val)
ruby-1.9.2-p0 ?>          end                                                    # end
ruby-1.9.2-p0 ?>      end
ruby-1.9.2-p0 ?>  end
 => nil 

tourist_irb_session_2.rb

ruby-1.9.2-p0 > c = NeverWriteCodeLikeThis.new 'slug'
 => #<NeverWriteCodeLikeThis:0x00000101813128 @create_process="slug", @retrieve_process="slug", @update_process="slug"> 

tourist_irb_session_3.rb

ruby-1.9.2-p0 > c.methods.sort
 => [:!, :!=, :!~, :<=>, :==, :===, :=~, :__id__, :__send__, :class, :clone, :define_singleton_method, :display, :dup, :enum_for, :eql?, :equal?, :extend, :freeze, :frozen?, :hash, :initialize_clone, :initialize_dup, :inspect, :instance_eval, :instance_exec, :instance_of?, :instance_variable_defined?, :instance_variable_get, :instance_variable_set, :instance_variables, :is_a?, :kind_of?, :method, :methods, :nil?, :object_id, :private_methods, :protected_methods, :public_method, :public_methods, :public_send, :respond_to?, :respond_to_missing?, :send, :singleton_class, :singleton_methods, :taint, :tainted?, :tap, :to_enum, :to_s, :trust, :untaint, :untrust, :untrusted?] 

tourist_irb_session_4.rb

ruby-1.9.2-p0 > c.instance_variables
 => [:@create_process, :@retrieve_process, :@update_process] 
ruby-1.9.2-p0 > c.instance_variable_get :@create_process
 => "slug"