Thanks,  I got what I wanted this morning.   Adding it here to improve my 
question as well.

I originally used this from the literature:
   Field('modified_by', 'reference auth_user',
          default=auth.user_id, update=auth.user_id, writable=False),

This is what I needed:
   Field('modified_by', 'string',
          default=auth.user.email, update=auth.user.email, writable=False),

1. I don't think I need the 'reference'  as no code other than the model is 
every going to be updating the field because it has a default and update 
and is not writable.
2. Once without the reference, I can set the field to text type and copy 
what I want.
3. Note to corporate types: I'll be using this with active directory, so I 
expect auth.user.username would be the better field.  I used 
auth.user.email in the example because that is available out of the box.



On Friday, December 13, 2013 8:36:24 PM UTC-5, Massimo Di Pierro wrote:
>
> Should not be default=auth.user but default=auth.user_id (same for 
> update=...) Anyway you will get Null when user_id is None.
>
>

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