Rails - Jul 2006 - record validation based on controller method

i have an app i''m working on right now that has "jobs" that
need to be
created in a queue. then there is another form for a user to go in and 
complete these jobs. when it is completed, i want the users to be 
required to add notes to the job before it is completed.

is there any easy way to perform validations on a record just from one 
controller action or method?

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Posted via http://www.ruby-forum.com/.

just as i was posting this, i saw something in the api:

class Person < ActiveRecord::Base
    validates_numericality_of :value, :on => :create
end

is the :on what i''m looking for? can it be used for all of the 
validation methods? and can i pass more than one action to it?

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