db.define_table('x',
db.Field('y_id',db.y,requires=IS_IN_DB(db,'y.id','%(name)s'),
db.Field('name','string',requires=[
IS_NOT_EMPTY(),
IS_NOT_IN_DB(???????,'x.name')
]
),
)
The question is this: How to write the requires clause such that the
x.name field is unique within the scope of the x.y_id? In other words,
for a given x.y_id, all x.names must be unique. However, x.name may be
repeated as long as the x.y_id is different for each occurrence of
x.name.
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