Rails - Sep 2009 - calling partials from a layout - once nil, once not nil

Hi,

Rails 2.3.3 + restful_authentication.

current_user is a method from lib/authenticated_system.rb through
"include AuthenticatedSystem" in application_controller.rb

-------- home/_current_user.pl.html.erb  :   --------
<% if current_user %>
  NOT NIL
<% else %>
  NIL
<% end %>

-------- home/_user_box.pl.html.erb  :   --------
<% if current_user %>
  NOT NIL
<% else %>
  NIL
<% end %>

-------- layouts/layout.html.erb  :   --------
<%= render :partial => ''/home/current_user'' -%>
<%= render :partial => ''/home/user_box'' %>

----- OUTPUT: -------
NIL
NOT NIL

---- LOGS: -------
[INFO : 0925 13:43:58 #9238] Rendering template within layouts/layout
[INFO : 0925 13:43:58 #9238] Rendering home/index
[DEBUG: 0925 13:43:58 #9238] Rendered home/_current_user.pl (0.2ms)
[DEBUG: 0925 13:43:58 #9238]   User Columns (1.9ms)   SHOW FIELDS FROM
`users`
[DEBUG: 0925 13:43:58 #9238]   User Load (0.2ms)   SELECT * FROM `users`
WHERE (`users`.`id` = 1) LIMIT 1
[DEBUG: 0925 13:43:58 #9238] Rendered home/_user_box.pl (6.9ms)
[INFO : 0925 13:43:58 #9238] Completed in 16ms (View: 8, DB: 2) | 200 OK
[http://localhost/]


Why is that so? Why one time it is nil and the other time it is not nil?

Any help appreciated.

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

Michal Burak wrote:
> 
> -------- home/_current_user.pl.html.erb  :   --------
> <% if current_user %>
>   NOT NIL
> <% else %>
>   NIL
> <% end %>
> 
> -------- home/_user_box.pl.html.erb  :   --------
> <% if current_user %>
>   NOT NIL
> <% else %>
>   NIL
> <% end %>
> 
> -------- layouts/layout.html.erb  :   --------
> <%= render :partial => ''/home/current_user'' -%>
> <%= render :partial => ''/home/user_box'' %>
> 
> 
> Why is that so? Why one time it is nil and the other time it is not nil?
> 
> Any help appreciated.
> 
> Regards.
It has to do with the name of the partial, Rails does some magic by 
looking at the name of the partial and then making a local variable 
(with the same name as the partial) accessible to that partial.

i.e.  a partial entitled "_current_user"  will have current_user as a 
local whereas a partial entitled "_user_box" will have user_box as a 
local.

This was new functionality introduced with rails 2 I believe..

Don''t forget that the render() can have :object and :locals passed into
it..

hth

ilan



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