[web2py] Can a table field reference a list?

[lyn2py]

Hi guys,

db.define_table('activities', 
    Field('name', 'string',length=255,requires=IS_NOT_EMPTY()),
    Field('description','text'),
    format='%(name)s'

)

db.define_table('activity', 
    Field('user_id','reference auth_user',default=auth.user_id),
    Field('activity_id','reference activities'), 
)


Instead of the above code, can I have the second table reference a list / 
tuple instead of a table? How should I do it?

--