db.define_table('tab',
    Field('exchg_id', 'reference exchgs', required=True),
    Field('xcurr_id', 'reference xcurrs', required=True),
    Field('key1', 
        compute=lambda r: "%s:%s" % (r['exchg_id'], r['xcurr_id']),
        length=55, unique=True, required=True),
)
not work ((

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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