link_to using smart API

Trying to use the "smart" API for link_to

def create_link(object, label = nil)
   label ||= auth_labels[:new]
   link = link_to(label, [:new, object]) if can?(:create, object)
   link.sub /new\./, 'new/'
end

But this generates a link like /projects/new.1 , instead of /projects/
new
I would assume it would make sense to pass it the class instead, like
this, sense in this case the class itself should carry enough
information to generate the path?

def create_link(object, label = nil)
   label ||= auth_labels[:new]
   link = link_to(label, [:new, object.class]) if can?(:create,
object)
end

But then I get:

undefined method `new_projects_path' for #<#<Class:0x000001017f0ad8>:
0x000001017eebe8>

If I substitute the key with :create it tries with
create_projects_path which doesn't exist.

What am I doing wrong here? Or is it a bug in edge rails?

See the other thread for Yehuda’s suggestion.