ruby on rails - Allow users to edit/destroy their own profiles only from the index -

how grant permission edit/ destroy links on by-user basis in user index of rails?

i'm using rails3, devise , cancan define role based abilities.

i'd current user able see , access link edit/delete profile in user index page. should not able see or access these links other users.

i've set following in index view:

<% if can? :update, @user %>      <%= link_to 'edit', edit_user_registration_path(@user) %> |  <% end %> 

and in abilities.rb

def initialize(user)      can :update, user, :id => user.id     if user.role? :super_admin        can :manage, :all     end end 

my superadmin can see , edit links users in index.

my user can see links no one, not themselves.

the more read around more confused get, devise, cancan , user model playing role.

i'd appreciate confirmation i'm on right track, , grateful pointers towards useful information me understand this.

many thanks

in abilities.rb

can :manage, user |u|   u.id == user.id end 

if want go id.

your view looks me.