from trytond.pool import PoolMeta
from trytond.model import fields
from trytond.pyson import Eval, If


class Address(metaclass=PoolMeta):
    __name__ = 'party.address'

    campus = fields.Boolean("Campus")
    party_related = fields.Many2One('party.party', "Party Related",
                                    states ={ 'invisible': (~Eval("campus"))})