this answer doesn’t pollutes the class space, example.. if i do mine.my_number 4 then the other instances of Mine will not get the my_4 method.. this happens because we use the singleton class of the object instead of the class. class Mine def my_number num singleton_class.class_eval { attr_accessor “my_#{num}” } send(“my_#{num}=”, num) end end a … Read more
Rails has attr_accessor_with_default so you could write class Like attr_accessor_with_default :politics,false end i = Like.new i.politics #=> false and thats all UPDATE attr_accessor_with_default has been deprecated in Rails 3.2.. you could do this instead with pure Ruby class Like attr_writer :politics def politics @politics || false end end i = Like.new i.politics #=> false
You may use the different accessors to communicate your intent to someone reading your code, and make it easier to write classes which will work correctly no matter how their public API is called. class Person attr_accessor :age … end Here, I can see that I may both read and write the age. class Person … Read more