def url(page)
      @base_url_params ||= begin
                             url_params = merge_get_params(default_url_params)
                             merge_optional_params(url_params)
                           end

      url_params = @base_url_params.dup
      add_current_page_param(url_params, page)

      # Add optional url_builder support
      (@options[:url_builder] || @template).url_for(url_params)
    end
def url(page)
      @base_url_params ||= begin
                             url_params = merge_get_params(default_url_params)
                             merge_optional_params(url_params)
                           end

      url_params = @base_url_params.dup
      add_current_page_param(url_params, page)

      # Add optional url_builder support
      (@options[:url_builder] || @template).url_for(url_params)
    end
This method adds the `url_builder` option so we can pass in the
 mounted Rails engine's scope for will_paginate