Rails - Nov 2007 - Trouble overriding default accessor/mutator

I have a database column storing a duration value as a number of
seconds, but I''d like users to be able to see it and edit it as a time
value. I am trying to override the default accessor/mutator for the
attribute and do the conversions there, using something that looks
like:

	def duration
		Time.at(self[:duration].to_i).getutc
	end

	def duration=(value)
		self[:duration] = value.to_i
	end

Everything seems OK, but when I go to save the record, I get the
following:

 ActiveRecord::MultiparameterAssignmentErrors in
AdminController#update

1 error(s) on assignment of multiparameter attributes

What am I missing?
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