How to delete slug from history

# slug_controller.rb

class SlugsController < ApplicationController 
def destroy 
@slug = FriendlyId::Slug.find(params[:id]) 
@slug.destroy 
redirect_to :back, :notice => "The URL <strong>/#{@slug.slug}</strong> has been removed" 
end 
end 

<br>

# routes.rb

resources :slugs, :only => :destroy 

# in a view

<%= link_to 'Delete slug', slug_path(slug.id), :method => :delete %>