You still need _path. So in your case, since it is the login which I'm 
assuming is new_admin_session, it would be

<%= render “sidebar” unless current_page?(new_admin_session_path) %>

On Wednesday, August 13, 2014 1:20:26 PM UTC-6, Roelof Wobben wrote:
>
> Rake routes : 
>
>
>   Prefix Verb       URI Pattern                Controller#Action              
>                                                                               
>                                                                               
>                           
>
>         new_admin_session GET    /admins/sign_in(.:format)  
> devise/sessions#new                                                           
>                                                                               
>                                                          
>
>             admin_session POST   /admins/sign_in(.:format)  
> devise/sessions#create                                                        
>                                                                               
>                                                          
>
>     destroy_admin_session DELETE /admins/sign_out(.:format) 
> devise/sessions#destroy                                                       
>                                                                               
>                                                          
>
> cancel_admin_registration GET    /admins/cancel(.:format)   
> devise/registrations#cancel                                                   
>                                                                               
>                                                          
>
>        admin_registration POST   /admins(.:format)          
> devise/registrations#create                                                   
>                                                                               
>                                                          
>
>    new_admin_registration GET    /admins/sign_up(.:format)  
> devise/registrations#new                                                      
>                                                                               
>                                                          
>
>   edit_admin_registration GET    /admins/edit(.:format)     
> devise/registrations#edit                                                     
>                                                                               
>                                                          
>
>                           PATCH  /admins(.:format)          
> devise/registrations#update                                                   
>                                                                               
>                                                          
>
>                           PUT    /admins(.:format)          
> devise/registrations#update                                                   
>                                                                               
>                                                          
>
>                           DELETE /admins(.:format)          
> devise/registrations#destroy                                                  
>                                                                               
>                                                          
>
>            dashboard_show GET    /dashboard/show(.:format)  dashboard#show    
>                                                                               
>                                                                               
>                                        
>
>                      root GET    /                          dashboard#show    
>   
>
> I tried already  new_admin_registration but then I see the same error 
> message.
>
> Roelof
>
>
> Op woensdag 13 augustus 2014 21:09:30 UTC+2 schreef Germano Teixeira:
>
>> run "rake routes" in cosole to see your login path.
>>
>>
>> 2014-08-13 16:08 GMT-03:00 Germano Teixeira <[email protected]>:
>>
>>> You have to look in your routes file what is your login_path. 
>>> login_path is just a example.
>>>
>>>
>>> 2014-08-13 15:24 GMT-03:00 Roelof Wobben <[email protected]>:
>>>
>>> Sorry but I do not work.  I see a message that login_path is not known. 
>>>> I think that devise is messing things  up. 
>>>>
>>>> Roelof
>>>>
>>>> Op woensdag 13 augustus 2014 17:56:23 UTC+2 schreef Eric Saupe:
>>>>
>>>>> No, the render command goes in your layout in this case since it is 
>>>>> something that a lot of your views are using.
>>>>>
>>>>> <%= render “sidebar” unless current_page?(login_path) %>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Wednesday, August 13, 2014 12:32:48 AM UTC-6, Roelof Wobben wrote:
>>>>>>
>>>>>> oke , and put this in the controller ??
>>>>>>
>>>>>> Roelof
>>>>>>
>>>>>>
>>>>>> Op woensdag 13 augustus 2014 08:26:52 UTC+2 schreef matt:
>>>>>>
>>>>>>> you could use current_page with route to check the page.  Ex:
>>>>>>> render “sidebar” unless current_page?(login_path)
>>>>>>>
>>>>>>> Matt
>>>>>>> On Aug 13, 2014, at 2:20 AM, Roelof Wobben <[email protected]> 
>>>>>>> wrote:
>>>>>>>
>>>>>>> Hello, 
>>>>>>>
>>>>>>> Allmost all pages have the same layout except the login page.
>>>>>>> There the sidebar with menu is not visible. 
>>>>>>>
>>>>>>> Is there a way to tell rails that when im on the login page the 
>>>>>>> sidebar must not be visible. 
>>>>>>>
>>>>>>> Roelof
>>>>>>>
>>>>>>>
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