mechanize create google alert in ruby on rails

Question

I am trying to create google alerts in ruby. I am using mechanize.

@web_agent = Mechanize.new
page = @web_agent.get 'https://www.google.com/alerts'
form = page.form_with :name => 'f1'

form.q = "search keyword"

I am getting nil form value.

I am getting error:

undefined method `q= for nil:NilClass`

Google has changed html, so I need some hack.