Rails - Jul 2006 - Class variables in templates/layouts

I''m having problems with class variables.. I have a class:

class Content::ApplicantsController < ApplicationController
  layout "mylayout"
  @@tab = "mystring"
  [... the rest is standard scaffold-created stuff ...]


and a layout (mylayout.rhtml):

[...]
<title><%= @@tab.capitalize %></title>
[...]


And I keep getting this error:


uninitialized class variable @@tab in
ActionView::Base::CompiledTemplates

I''ve searched the net and come up dry. Ruby docs say I''m
supposed to
initialize class variables before I can use them but I''d assume that
the
`` = "mystring" `` would count as initializing it...

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i think it is deep in the language, that you actually have to initialize 
it via the initialize(arg/args) definition, although i am not definately 
sure...

what about if you do this inside the class -

def initialize(str)
  @str = str
end

@@tab =  Classinstancevar.new("mystring")

will this work?

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Posted via http://www.ruby-forum.com/.

Gabriel wrote:
>I''m having problems with class variables.. I have a class:
>
>class Content::ApplicantsController < ApplicationController
>  layout "mylayout"
>  @@tab = "mystring"
>  [... the rest is standard scaffold-created stuff ...]
>
>
>and a layout (mylayout.rhtml):
>
>[...]
><title><%= @@tab.capitalize %></title>
>[...]
>
>
>And I keep getting this error:
>
>
>uninitialized class variable @@tab in
>ActionView::Base::CompiledTemplates
>
>I''ve searched the net and come up dry. Ruby docs say I''m
supposed to
>initialize class variables before I can use them but I''d assume
that the
>`` = "mystring" `` would count as initializing it...
>
>  
>
I think rails only copies instance variables from the controller objects 
to the view objects.

-- 
Jack Christensen
jackc@hylesanderson.edu

shai wrote:
> what about if you do this inside the class -
> def initialize(str)
>   @str = str
> end
> @@tab =  Classinstancevar.new("mystring")
> will this work?

I''m not sure... I don''t think I get the chance to initialize a
Controller manually....


Jack Christensen wrote:
> I think rails only copies instance variables from the controller objects
> to the view objects.

Hm... What''s the best way to get a variable to the view for all actions
if you can''t do it with a class variable?

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I''m using a DATE field, for my primary key table.

but When 

@mymodel = Feeding.new(@params[''mymodel''])   

@mymodel.save

it ignores the param "ID" and try to put the default value of the
empty
field, wicht is "0000-00-00"

what is wrong?

tks

cooperg-YSGFQ8SKJZVDPfheJLI6IQ@public.gmane.org escreveu:

shai wrote:

what about if you do this inside the class -
def initialize(str)
  @str = str
end
@@tab =  Classinstancevar.new("mystring")
will this work?

I''m not sure... I don''t think I get the chance to initialize a
Controller manually....

Jack Christensen wrote:

I think rails only copies instance variables from the controller objects
to the view objects.

Hm... What''s the best way to get a variable to the view for all actions
if you can''t do it with a class variable?


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Hi --

On Thu, 6 Jul 2006, cooperg@myrealbox.com wrote:
> shai wrote:
>> what about if you do this inside the class -
>> def initialize(str)
>>   @str = str
>> end
>> @@tab =  Classinstancevar.new("mystring")
>> will this work?
>
>
> I''m not sure... I don''t think I get the chance to
initialize a
> Controller manually....
>
>
> Jack Christensen wrote:
>> I think rails only copies instance variables from the controller
objects
>> to the view objects.
>
>
> Hm... What''s the best way to get a variable to the view for all
actions
> if you can''t do it with a class variable?
Put it in an instance variable that you initialize in a before_filter
in application.rb.


David

-- 
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take
    the time to fully understand Ruby--and with "Ruby for Rails" David
       has provided just what you need to help you achieve that goal."
       -- DAVID HEINEMEIER HANSSON, in the foreword to RUBY FOR RAILS.
  Complete foreword & sample chapters at http://www.manning.com/black!

> Put it in an instance variable that you initialize in a before_filter
> in application.rb.
> 
Yeah I just came to that conclusion... I''d rather have a class
variable.
;)

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