ruby - Empty item at end of .each loop because of rails cycle method -

i have list should show activities inside category, , sort of works last element displayed strange. there 4 activities in db particular category , @ end of list i'm getting item /categories/1/activities

%table.catlist   - @category.activities.each |activity|     %tr{:class => cycle('one','two')}       %td= link_to activity.name, [@category, activity]       %td   

i tried:

link_to activity.name, category_activity_path(:category_id => @category.id, :id => activity.id) 

but that's not working @ all, , giving me error:

no route matches {:category_id=>1, :action=>"show", :controller=>"activities", :id=>nil} 

the routes nested this:

  resources :categories     resources :activities       resources :records     end   end 

it's showing right, closes list strange element activity path, without id.

edit

i think happening because of cycle method supposed switch between css classes. ideas how empty row can avoided?

you building new activity in controller included in list of activities @category. if have following code in controller,

@activity = @category.activities.build 

try changing to

@activity = activity.new category_id: @category.id 

or add check in view show persisted activities.

- @category.activities.each |activity|   - next if activity.new_record?   %tr{:class => cycle('one','two')}     %td= link_to activity.name, [@category, activity]     %td