Rails - Aug 2005 - Session and Controller: undefined local variable or method

Hello List,

i am newby to rails and i am stuck with a problem concerning rails session and 
controllers.

I tried to write a class which should be used as a before_filter.


-------------------------
class AuthorizeFilter < ActionController::Base

def self.filter(controller)
	user_id = session[:user_id]
	@perm = User.find(user_id).perm_strings
	unless @perm.include?(controller.action_name) 
		flash[:notice] = "You do not have the permissions to access 
this functionality"
		jumpto = session[:jumpto] || { :action => "index" }
		session[:jumpto] = nil
		redirect_to(jumpto) and return false
	end
end

end

-----------------------------

After invoking it as 

before_filter AuthorizeFilter

I get the following error message:

undefined local variable or method `flash'' for AuthorizeFilter:Class
/app/controllers/authorize_filter.rb:14:in `filter''
script/server:49
Show framework trace 
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/filters.rb:321:in `call_filters''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/filters.rb:313:in `each''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/filters.rb:313:in `call_filters''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/filters.rb:302:in `before_action''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/filters.rb:294:in
`perform_action_without_benchmark''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/benchmarking.rb:41:in 
`perform_action_without_rescue''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/benchmarking.rb:41:in `measure''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/benchmarking.rb:41:in 
`perform_action_without_rescue''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/rescue.rb:80:in `perform_action''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/base.rb:356:in `send''
c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
1.9.1/lib/action_controller/base.rb:356:in `process''
c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-0.13.1/lib/dispatcher.rb:32:in 
`dispatch''
c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
0.13.1/lib/webrick_server.rb:105:in `handle_dispatch''
c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
0.13.1/lib/webrick_server.rb:71:in `service''
c:/programme/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service''
c:/programme/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:155:in `start_thread''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start_thread''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:94:in `start''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:89:in `each''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:89:in `start''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''
c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''
c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
0.13.1/lib/webrick_server.rb:57:in `dispatch''

--------------------------------------------------------------

I tried other szenarios with diffrent controllers using the same session 
variable and everything worked.

What is wrong?

Govinda

On Aug 1, 2005, at 5:18 AM, Govinda wrote:
> Hello List,
>
> i am newby to rails and i am stuck with a problem concerning rails  
> session and
> controllers.
>
> I tried to write a class which should be used as a before_filter.
>
>
> -------------------------
> class AuthorizeFilter < ActionController::Base
>
> def self.filter(controller)
>     user_id = session[:user_id]
>     @perm = User.find(user_id).perm_strings
>     unless @perm.include?(controller.action_name)
>         flash[:notice] = "You do not have the permissions to access
> this functionality"
>         jumpto = session[:jumpto] || { :action => "index" }
>         session[:jumpto] = nil
>         redirect_to(jumpto) and return false
>     end
> end
>
> end
The problem is that ''filter'' is being defined at the class
level, but
''flash'' (and ''session'', and
''redirect_to'') are all defined at the
instance level. What you probably want, instead, is:

   controller.session[...]
   controller.flash[...]
   controller.redirect_to(...)

Although some (or all) of those may be protected methods, so you''d  
actually have to do:

   controller.send(:session)[...]
   controller.send(:flash)[...]
   controller.send(:redirect_to, ...)

(And in case you''re wondering, you didn''t get an error on the
#session call because there just happens to be a "session" method at  
the class level, but it is used for controlling the session  
configuration, not for accessing the session.)

- Jamis
>
> -----------------------------
>
> After invoking it as
>
> before_filter AuthorizeFilter
>
> I get the following error message:
>
> undefined local variable or method `flash'' for
AuthorizeFilter:Class
> /app/controllers/authorize_filter.rb:14:in `filter''
> script/server:49
> Show framework trace
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/filters.rb:321:in `call_filters''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/filters.rb:313:in `each''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/filters.rb:313:in `call_filters''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/filters.rb:302:in `before_action''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/filters.rb:294:in  
> `perform_action_without_benchmark''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/benchmarking.rb:41:in
> `perform_action_without_rescue''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/benchmarking.rb:41:in `measure''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/benchmarking.rb:41:in
> `perform_action_without_rescue''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/rescue.rb:80:in `perform_action''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/base.rb:356:in `send''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/actionpack-
> 1.9.1/lib/action_controller/base.rb:356:in `process''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-0.13.1/lib/ 
> dispatcher.rb:32:in
> `dispatch''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
> 0.13.1/lib/webrick_server.rb:105:in `handle_dispatch''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
> 0.13.1/lib/webrick_server.rb:71:in `service''
> c:/programme/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in
`service''
> c:/programme/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:155:in
`start_thread''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:144:in `start''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:144:in
`start_thread''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:94:in `start''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:89:in `each''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:89:in `start''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''
> c:/programme/ruby/lib/ruby/1.8/webrick/server.rb:79:in `start''
> c:/programme/ruby/lib/ruby/gems/1.8/gems/rails-
> 0.13.1/lib/webrick_server.rb:57:in `dispatch''
>
> --------------------------------------------------------------
>
> I tried other szenarios with diffrent controllers using the same  
> session
> variable and everything worked.
>
> What is wrong?
>
> Govinda
>
>
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