How do i change link_to with renamed resources?

hi,

i want to re-use resource under different scopes (same views etc…):

scope 'admin' , :myscope=>’'admin do
resources :photos , as: 'admin_photos'
end

resources :photos, :myscope=>’'normal

–> how do i change the link_to links dynamically?

i have tried via like this, but no joy …:
'default_url_options {
:scope = > params[:myscope]
}

pls advise

thx
tom