Store cookie from HTTP header

How do you store a cookie with basic info.

i.e. link is http://www.domain.com/index.html?ref=123

How would I store a cookie with 开发者_如何学Cname of "ref" and the value of "123"?

see http://api.rubyonrails.org/classes/ActionController/Cookies.html

use following code in your controller:

cookies[:ref] = 123

or

cookies[:ref] = params[:ref]