Ruby, How to add a param to an URL that you don't know if it has any other param already

Question

I have to add a new param to an indeterminate URL, let\'s say param=value.

In case the actual URL has already params like this

http://url.co         


        

Answer 1

require 'uri'

uri = URI("http://url.com?p1=v1&p2=2")
ar = URI.decode_www_form(uri.query) << ["param","value"]
uri.query = URI.encode_www_form(ar)
p uri #=> #

uri = URI("http://url.com")
uri.query = "param=value" if uri.query.nil?
p uri #=> #

EDIT:(by fguillen, to merge all the good propositions and also to make it compatible with his question test suite.)

require 'uri'

def add_param(url, param_name, param_value)
  uri = URI(url)
  params = URI.decode_www_form(uri.query || "") << [param_name, param_value]
  uri.query = URI.encode_www_form(params)
  uri.to_s
end