module Pagy::UrlHelpers

def pagy_url_for(pagy, page, absolute: false, fragment: nil, **_)

For non-rack environments you can use the standalone extra
It supports all Rack-based frameworks (Sinatra, Padrino, Rails, ...).
Return the URL for the page, relying on the params method and Rack by default. 
def pagy_url_for(pagy, page, absolute: false, fragment: nil, **_)
  vars         = pagy.vars
  query_params = request.GET.clone(freeze: false)
  query_params.merge!(vars[:params].transform_keys(&:to_s)) if vars[:params].is_a?(Hash)
  pagy_set_query_params(page, vars, query_params)
  query_params = vars[:params].(query_params) if vars[:params].is_a?(Proc)
  query_string = "?#{Rack::Utils.build_nested_query(query_params)}"
  "#{request.base_url if absolute}#{vars[:request_path] || request.path}#{query_string}#{fragment}"
end