That's great. Thanks - I simply hadn't thought that I could switch which
table the IS_IN_DB 'table.value_field' argument was pointing to in order to
shift which fields were available.
To give the specific answer for my case:
db.datasets.project_id.requires = IS_IN_DB(query,
'project_details.project_id',
'(%(project_id)s) %(title)s',
zero='Select project.')
Cheers,
David
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