Issue with Observers and has_one association...

Hey Guys,

I'm getting a peculiar bug working with Observers and has_one
associations. When a has_one association is invoked by an Observer it
always returns null. I looked in the development.log file and the SQL
for the has_one association isn't even being executed. On the other
hand, when I replace the has_one association with just a hand crafted
method, it does get called correctly. So the following does not work:

class Task

  has_one :current_instance,
           :class_name => 'TaskInstance',
           :foreign_key => 'task_id',
           :order => 'start_at DESC',
           :conditions => 'end_at IS NULL'

but when replaced with the follwoing, it does work.

  def current_instance
                      :conditions=>"task_id=#{} AND end_at IS
                      :order=>'start_at DESC'

I'm working with Rails 2.0.2 and the problem doesn't affect the
belongs_to nor the has_many associations. I'd hate to replace my
lovely has_one associations with hand-crafted methods....