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import sqlalchemy as sa
from sqlalchemy_utils.observer import observes
from tests import TestCase
class TestObservesForColumn(TestCase):
dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
def create_models(self):
class Product(self.Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
price = sa.Column(sa.Integer)
@observes('price')
def product_price_observer(self, price):
self.price = price * 2
self.Product = Product
def test_simple_insert(self):
product = self.Product(price=100)
self.session.add(product)
self.session.flush()
assert product.price == 200
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