Question

I need to create an enumeration that I will need to initialize from a value from the querystring.

Example of what I have and what I need to do:

class UserType
   NONE = 0
   MEMBER = 1
   ADMIN = 2
   SUPER = 3
end

Now in my querystring I will have:

/users/load_by_type?type=2

Now in my controller I will get the value 2 from the querystring, I then need to have a UserType object which has the value ‘MEMBER’.

How can I do this?

If my class isn’t really a good enumeration hack, please advise.

Answer 1

I think I’d rather use hashes for this kind of thing, but just for fun:

class Foo
  BAR = 1
  STAN = 2

  class << self
    def [](digit)
      constants.find { |const| const_get(const) == digit }
    end
  end
end

puts Foo[1] # BAR
puts Foo[2] # STAN