Rails - May 2007 - Assigning default values to attributes in a has_one association

Hi List,

I''ve a little  problem here, for which I can''t find a
solution:

I have two models, person and event. Event is a polymorphic association 
(timeable). In my person model I would like to define an association with 
Events:

class Person < ActiveRecord::Base

    has_one birthday, 
        :dependent => :destroy, 
        :as => :timeable, 
        :class_name => "Event", 
        :foreign_key => :timeable_id, 
        :conditions => "category = ''birthday''"

end

As you can see, there''s a category field in the event table, which
should
contain the category of the Event. In this case, is should 
contain "birthday". 

I would like this category attribute to get set automatically to
"birthday"
whenever I create a new association.

So, calling simething like 

@client.build_birthday(params[:birthday])

in my controller should set the category attribute to "birthday". I
was trying
something like:

    has_one birthday, 
        :dependent => :destroy, 
        :as => :timeable, 
        :class_name => "Event", 
        :foreign_key => :timeable_id, 
        :conditions => [''category = ?'', name.to_s] do
            self.category = "birthday"
        end

But this seems not to work. 

Also there are callbacks for collection associations (i.e. before_add and 
after_add), but this does not work with has_one associations. 

So, what would be the best way of doing womthing like this (I sure there is at 
least _one_ way...)

Regards,
Timo

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