I have run into the following regression bug when upgrading my app to
2.2 and created a patch to fix it:
It includes the tests written by the ticket author.
date_select and datetime_select helpers blow up (calling a method on
nil) when you have a date/datetime attribute that is nil and you try
to show it in a helper that hides the day selection and includes
<%= form.date_select 'end_date',
:discard_day => true,
:include_blank => true %>
Please give the patch some reviewing love and apply it ASAP, if
possible. It is a stupid but hard to debug error that will give people
lots of headaches.