Variables visible in all actions in a controller

Rails
1

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”

2

Jaikishan J. wrote:

  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.

3

On Mon, Sep 22, 2008 at 9:05 AM, Jaikishan J. [email protected]
wrote:

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.