You could also conditionally define the virtual field only when you will
need it (define it before executing the select query).
Anthony
On Friday, October 18, 2013 9:07:34 AM UTC-4, Anthony wrote:
>
>
> db.define_table('tableaa', Field('afield', 'string', required=True ),
>> Field('bfield', 'string', required=True ),
>> )
>> db.tableaa.virtfield = Field.Virtual( lambda row: XML("<strong>" +
>> row.tableaa.afield + '</strong><br> ' + row.tableaa.bfield ))
>>
>> When this something is a virtual field, as is the case then the two
>> fields it concatenates need to be in every query I select from that table
>> or I get an error regardless of whether the virtual field is in the list of
>> selected fileds or not.
>>
>
> You could re-write the virtual field function so it doesn't fail when one
> or both of the required fields are missing:
>
> def virtfield(row):
> try:
> return CAT(STRONG(row.tableaa.afield), BR(), STRONG(row.tableaa.
> bfield))
> except:
> return ''
>
> db.tableaa.virtfield = Field.Virtual(virtfield)
>
> Anthony
>
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