I've made a database table in this format,
db.define_table('user',
    Field('country', requires=IS_IN_DB(db, 'country.id', '%(name)s')),
    Field('school', requires=IS_IN_DB(db, 'school.id', '%(name)s')),
)

db.define_table('country',
    Field('name'),
)

db.define_table('school',
    Field('name'),
)

how can i ensure that, when a user selects a certain country, only certain 
schools are shown in the school dropdown menu? and different schools are 
shown for a different country?

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