url_helper.rb

require 'rack'
require 'uri'

module UrlHelper
  def self.merge_url_with_params(url, params = {}) 
    uri = URI.parse(url)
    query = Rack::Utils.parse_query(uri.query || '') 
    params.each do |key, value|
      query[key.to_s] = value
    end 
    uri.query = Rack::Utils.build_query(query)                                                                                                                                                   
    uri.to_s
  end 
end