Fix for not being able to read a cookie set mid-request

Koz asked me to post this here:

Doing this within an action won't return the expected result:

cookies[:abc] = "123"
render :text => cookies[:abc]

The reason has nothing to do with strings/symbols as cookie keys but
is due to the fact that ActionController's cookies method gets a fresh
CookieJar every time it's called.

The fix (monkeypatched here in an initializer) is simply:

module ActionController #:nodoc:
module Cookies

def cookies
  @cookies ||= CookieJar.new(self)
end

end end

The current code in actionpack/lib/action_controller/cookies.rb looks like this:

def cookies
  CookieJar.new(self)
end

I even note that the []= method seems to call super as if this functionality is expected to work.

I know everyone's probably focussed on 3.0, but this is a real doozy of an issue if you hit it (for example, see the blog post at - http://www.40withegg.com/articles/rails-cookies-mangles-the-hash-in... - not mine!).