>
> db.define_table('shipment',
>     Field('shipment_id', represent=lambda value,row: \
>         A(value, _href=(row.carrier.url + value, ))),
>

Why is your href a tuple? How about:

A(value, _href=row.carrier.url + value)

That should produce http://www.bing.com/search?q=trumpet as long as 
row.carrier.url is the string "http://www.bing.com/search?q="; (assuming the 
shipment_id value is "trumpet").

Anthony

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