Rails - Sep 2008 - Variables visible in all actions in a controller

Hello,
I want make a variable visible to all actions in a controller. Everytime
user submits a parameter "school_class_id" on the basis of which I
assign a
variable which I want to make available to all the actions in controller.

I used before_filter: set_class_id where set_class_id is defined as

def set_class_id
   @currentClassid = session[:currentclassid]
   if !params[:class_list].nil?
      if !params[:class_list][:class_id].nil?
            @currentClassid = params[:class_list][:class_id]
     end
end
end

In this case, value of @currentClassid changes in index action. However in
other actions, it remains the same as the value it is assigned intially for
the first time ( In this case , the value in the session ). I am clueless
why this is happening. If in index action, the value of @currentClassid is
changing, then why not in other actions?

-- 
Thanks,
Jaikishan

"Enjoying the rights of being intelligent ignorant"

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Jaikishan Jalan wrote:
> Hello,
> I want make a variable visible to all actions in a controller. Everytime
> user submits a parameter "school_class_id" on the basis of which
I assign a
> variable which I want to make available to all the actions in controller.
>
> I used before_filter: set_class_id where set_class_id is defined as
>
> def set_class_id
>    @currentClassid = session[:currentclassid]
>    if !params[:class_list].nil?
>       if !params[:class_list][:class_id].nil?
>             @currentClassid = params[:class_list][:class_id]
>      end
> end
> end
>
> In this case, value of @currentClassid changes in index action. However in
> other actions, it remains the same as the value it is assigned intially for
> the first time ( In this case , the value in the session ). I am clueless
> why this is happening. If in index action, the value of @currentClassid is
> changing, then why not in other actions?
How could it change? Instance variables (by definition) are restricted
to an instance of a class. When you view another action the filter
runs again and @currentClassid is set to session[:currentclassid]. If
you do want it to persist across actions you could put in back in the
session after setting it.
>
> --
> Thanks,
> Jaikishan
>
> "Enjoying the rights of being intelligent ignorant"
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On Mon, Sep 22, 2008 at 9:05 AM, Jaikishan Jalan
<jai.ism-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I want make a variable visible to all actions in a controller. Everytime
> user submits a parameter "school_class_id" on the basis of which
I assign a
> variable which I want to make available to all the actions in controller.
> I used before_filter: set_class_id where set_class_id is defined as
> def set_class_id
>    @currentClassid = session[:currentclassid]
>    if !params[:class_list].nil?
>       if !params[:class_list][:class_id].nil?
>             @currentClassid = params[:class_list][:class_id]
>      end
> end
> end
> In this case, value of @currentClassid changes in index action. However in
> other actions, it remains the same as the value it is assigned intially for
> the first time ( In this case , the value in the session ). I am clueless
> why this is happening. If in index action, the value of @currentClassid is
> changing, then why not in other actions?

If that filter runs in all actions, and the params are received, the
instance variable should store what''s in params. I guess in actions
other than index the params are not being sent.

A note on conventions: in Ruby instance variables use snake case:
@current_class_id.

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