In many models I have the following field definitions:

...
    Field('created_by',db.auth_user,default=me,writable=False),
    Field('created_on','datetime',default=request.now,writable=False),
    Field('modified_by',db.auth_user, default=me),
    Field('modified_on','datetime',default=request.now,writable=False))

When creating forms based on these tables, I've been using SQLFORM in
order to update the modified_on and the modified_by columns:

    if form.accepts(request.vars, session, keepvalues=True):
        opportunity.update_record(modified_by=1)
        opportunity.update_record(modified_on=request.now)
        response.flash='record updated'

This is the only reason for using SQLFORM on these controllers and
I've been wondering if there is some pattern to achieve the same using
crud. That is how could the modified_by and the modified_on fields be
updated

Txs,
Miguel
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