Rails - Sep 2012 - Validating an association as a whole rather than per entry

I have, `Transaction.has_many :splits` and Split has an amount:integer 
attribute. I''d like to ensure `transaction.splits = [split1, split2,
...]`
the sum of split1.amount + split2.amount + ... == 0. It seems that 
:before_add deals with the splits one by one whereas what I''d like is
to
check the array that''s being assigned (`[split1, ..]`) beforehand. Is
such
a thing possible?


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