link_to(:controller=>“something”) helper + Devise doesn't work properly

all! Maybe someone knows why this:

def index_link(object, content = t("#{object.to_s.pluralize}.index"))
  #link_to(content, {:controller=>object.to_s.pluralize}, :scope=>"") if can?(:read, p(object)) #this doesn't work too
  link_to(content, :controller=>"trademarks")
  #link_to(content, trademarks_path) #this do work, but I need to set path from object
end

makes an exception like this:

No route matches {:controller=>"devise/trademarks"}

stack:

actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:424:in `raise_routing_error'
actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:406:in `generate'
actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:453:in `generate'
actionpack (3.0.3) lib/action_dispatch/routing/route_set.rb:481:in `url_for'
actionpack (3.0.3) lib/action_dispatch/routing/url_for.rb:131:in `url_for'
actionpack (3.0.3) lib/action_view/helpers/url_helper.rb:99:in `url_for'
actionpack (3.0.3) lib/action_view/helpers/url_helper.rb:236:in `link_to'
app/helpers/application_helper.rb:53:in `index_link'
app/views/layouts/application.html.erb:20:in `_app_views_layouts_application_html_erb___741328535__615736668_0'
actionpack (3.0.3) lib/action_view/template.rb:135:in `send'
actionpack (3.0.3) lib/action_view/template.rb:135:in `render'

and how to make it work?