Rails - Apr 2006 - parent.children not updated (has_many)

Hi guys!

class Parent < ActiveRecord::Base
   has_many :children
end

class Child < ActiveRecord::Base
   belongs_to :parent
end

I do:

parent = Parent.find(1, :include => :children)
parent.children.find(3).update_attribute(''name'',
''Tom'') (or
parent.children.find(3).name = ''Tom'')

parent.children.find(3).name
   => ''old value''

The database is updated correctly, SELECT name FROM children WHERE id=3 
AND parent_id=1
   => ''Tom''

Only the array parent.children doesn''t seem to get updated. I cannot 
force reloading (parent.cildren(true).find(3).name would do the trick) 
because I would possibly lose unsaved children.

How can I update the parent.children array?

- Christian