The safest way is probably to redefine the whole table.

*models/dp.py:*

tA_args = dict(format='%(f1)s', ...)
db.define_table('tA',
    Field('f1', 'string'),
    **tA_args)

*controler/default.py:*

    db.define_table('tA', db.tA,
        Field('newfield'),
        redefine=True, **tA_args)

Anthony

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