Hi there, I am new in Ruby.
I got a question, maybe it''s stupid.
There is controller named ''home'', and a action named
''test'' existed.
And I defined a class variable named ''@@total''
looks like this:
class HomeController < ApplicationController
@@total = 0
def test
@@total += 1
render :text => @@total.to_s
end
end
The logic is very clear and simple, I wanna increase the value of
@@total when I call it every time.
So I connect the url: http://localhost:3000/home/test to try it.
But it ALWAYS responses me "1", there is no accumulation.
What''s going
on???
I read the Ruby book and api document, they say the class variable
should act likes a static variable in Java or C++.
But I don''t get the result I espected. Could somebody tell me why?
Thanks!
firestoke
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Frederick Cheung
2008-Apr-23 15:16 UTC
Re: Why the class variable doesn''t work correctly?
On 23 Apr 2008, at 16:12, firestoke wrote:> > Hi there, I am new in Ruby. > I got a question, maybe it''s stupid. > There is controller named ''home'', and a action named ''test'' existed. > And I defined a class variable named ''@@total'' > looks like this: > > class HomeController < ApplicationController > @@total = 0 > > def test > @@total += 1 > render :text => @@total.to_s > end > end > > The logic is very clear and simple, I wanna increase the value of > @@total when I call it every time. > So I connect the url: http://localhost:3000/home/test to try it. > But it ALWAYS responses me "1", there is no accumulation. What''s going > on???Classes are reloaded between requests in development mode. Fred --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Yup, what Fred said. Switch to production mode and try it then. Or, perhaps use the session to store the accumulator. That would be per-user session, though. If you want to persistent, across-the-application accumulator, use a file or the DB. -Danimal --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Okay, I already tried it and the result is correct now. Thanks! One more question, can I turn off the class auto-reload mechanism in development mode? firestoke --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Apr 23, 2008, at 10:32 PM, FireStoke wrote:> > Okay, I already tried it and the result is correct now. Thanks!You shouldn''t depend on it. For instance, if you ever do any sort of load balancing your application will break. If you need a value to persist, either put it in the session or in the database. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Firestoke, I''m sure you could, but the question is: why? part of the whole power of development mode is the class reloading. That way, as you edit your code, you don''t have to constantly restart your server. If you want to fiddle without the reloading, why not just stay in production mode? -Danimal On Apr 23, 10:32 pm, FireStoke <davidhung...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> Okay, I already tried it and the result is correct now. Thanks! > One more question, can I turn off the class auto-reload mechanism in > development mode? > > firestoke--~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Ok, I see it. I will try to save my static data into db. Thanks! :^) --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---