helper.rb

def more_products_link
  object = @store || @tag || @collection
  link_to 'Load More Products', [object, :view], :class => 'load-more-products', :remote => true if @products.next_page
end

products_controller.rb

def tile

  # /t/:tag     Show all by tag
  # /s/:store_slug    Show all by store
  # /c/:collection_slug   Show all by collection
  # Nothing passed    Show all by rank
  
  if params[:tag]
    # find by tag
    # to be implemented
    # @tag = Tag.friendly.find(params[:tag_slug])
  elsif params[:store_slug]
    @store = Store.friendly.find(params[:store_slug])
    @products = @store.products
  elsif params[:collection_slug]
    @collection = Collection.friendly.find(params[:collection_slug])
    @products = @collection.products
  else
    @products = Product
  end

  @products = @products.paginate(:page => params[:page]).order('rank DESC') 
  respond_to do |format|
    format.html
    format.json
  end
end