just an idea, if you just have 2 or under 10 option why not is_in_set 
validators instead?
e.g.
db.define_table('room',
    Field('name'), 
    Field('status') )
    
room.status.requires = IS_IN_SET([('Busy', T('Busy') ), ('Empty', 
T('Empty') ) ] )

best regards,
stifan

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