1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
from decimal import Decimal
import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
from tests import TestCase
class TestLazyEvaluatedSelectExpressionsForAggregates(TestCase):
dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
def create_models(self):
class Catalog(self.Base):
__tablename__ = 'catalog'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@aggregated('products', sa.Column(sa.Numeric, default=0))
def net_worth(self):
return sa.func.sum(Product.price)
products = sa.orm.relationship('Product', backref='catalog')
class Product(self.Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
price = sa.Column(sa.Numeric)
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
self.Catalog = Catalog
self.Product = Product
def test_assigns_aggregates_on_insert(self):
catalog = self.Catalog(
name=u'Some catalog'
)
self.session.add(catalog)
self.session.commit()
product = self.Product(
name=u'Some product',
price=Decimal('1000'),
catalog=catalog
)
self.session.add(product)
self.session.commit()
self.session.refresh(catalog)
assert catalog.net_worth == Decimal('1000')
def test_assigns_aggregates_on_update(self):
catalog = self.Catalog(
name=u'Some catalog'
)
self.session.add(catalog)
self.session.commit()
product = self.Product(
name=u'Some product',
price=Decimal('1000'),
catalog=catalog
)
self.session.add(product)
self.session.commit()
product.price = Decimal('500')
self.session.commit()
self.session.refresh(catalog)
assert catalog.net_worth == Decimal('500')
|
