54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
import sqlalchemy as sa
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from sqlalchemy_utils.observer import observes
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from tests import TestCase
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class TestObservesForOneToManyToOneToMany(TestCase):
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dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
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def create_models(self):
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class Device(self.Base):
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__tablename__ = 'device'
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id = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.String)
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class Order(self.Base):
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__tablename__ = 'order'
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id = sa.Column(sa.Integer, primary_key=True)
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device_id = sa.Column(
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'device', sa.ForeignKey('device.id'), nullable=False
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)
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device = sa.orm.relationship('Device', backref='orders')
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class SalesInvoice(self.Base):
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__tablename__ = 'sales_invoice'
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id = sa.Column(sa.Integer, primary_key=True)
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order_id = sa.Column(
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'order',
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sa.ForeignKey('order.id'),
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nullable=False
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)
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order = sa.orm.relationship(
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'Order',
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backref=sa.orm.backref(
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'invoice',
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uselist=False
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)
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)
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device_name = sa.Column(sa.String)
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@observes('order.device')
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def process_device(self, device):
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self.device_name = device.name
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self.Device = Device
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self.Order = Order
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self.SalesInvoice = SalesInvoice
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def test_observable_root_obj_is_none(self):
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order = self.Order(device=self.Device(name='Something'))
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self.session.add(order)
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self.session.flush()
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