Rails - Jun 2006 - validating embedded form parameters

For controller action filters, I cannot seem to find the syntax for 
validating nested request parameters. For example, let''s say I had an 
input field named "person[name]"

  verify :only => :create,
    :params => :person,
    :redirect_to => {:action => ''new''}

What is the syntax for verifying the name property? I have tried out 
every possibility I can think of, and nothing seems to work

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Similarly, how do you access variables on the right side of your 
parameter hash? For example, if you were redirecting from an update to 
an edit page, it would be very useful to send the user back to the same 
model object ID.

  verify :only => :update,
    :params => :body,
    :redirect_to => {:action => ''edit'', :id => ???}


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