While moving some applications to Rails 2.3 recently, I stumbled across some problems with testing cookies. E.g. this blog uses cookies to remember your name, email address and web url if you leave a comment. This way, you don’t need to re-enter these information the next time you leave a comment. These cookies are set by the controller action that creates new comments (in CommentsController#create):

1 cookies['blog_visitor_name'] = { :value => @comment.name, :expires => 1.year.from_now }

This is the extended form of setting a cookie (a hash is used to not only set the cookies value but also the expiration time. There are several more hash options available which are described in the ActionController#cookies documentation. The basic form (which only sets a simple session cookie that is valid until the visitor closes the browser) uses a simple string: