From: Rick DeNatale <rick.denatale@...>
Date: 2009-05-12T20:31:06+09:00
Subject: Re: inheritance in ruby

On Tue, May 12, 2009 at 6:47 AM, jarodzz <jarodzz@gmail.com> wrote:
> Hi, all.
> I'm really new to Ruby. Got this error:
>
> class Page
>    @url=""
>
>    def initialize
>        puts "going to "+@url
>    end
> end
>
> class MainPage < Page
>    @url = "Main"
> end
>
> class LoginPage < Page
>    @url = "Login"
> end
>
> every time a page is created, I want it to go to its own url.
>
> m = MainPage.new()
> # should print going to Main
> l = LoginPage.new()
> # should print going to Login
>
> But I tried @@, @ and found neither of them works.
>
> Anyone knows what kind of method or variable I could use?

It the url is fixed for all instances of each class I wouldn't use a
variable at all:

class Page
   def initialize
       puts "going to "+ url
   end
end

class MainPage < Page
   def url
     "Main"
   end
end

class LoginPage < Page
   def url
     "Login"
   end
end


-- 
Rick DeNatale

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