ruby-on-rails - Order products by distance with geocoder gem

Question

I have two models : Product and Location, and Location belongs_to Product.

I use the geocoder gem, and I want to do just as in this railscast but I can't figure it out...

Part of my app/views/products/index.html.erb

<% @products.each do |p| %>
   <%= p.name %>
   <%= @current_location.distance_to(p.location) %>
<% end %>

Part of my app/controllers/products_controller.rb

def index
  @current_location = params[:search]
  if @current_location
    @products = Product.with(:location).near(@current_location, order: :distance).paginate(page: params[:page])
  else
    @products = Product.paginate(page: params[:page])
  end
end   

But it renders this :

undefined method `with' for ....

Can you help me order my product by distance with geocoder ?