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from decimal import Decimal
import pytest
import sqlalchemy as sa
from sqlalchemy_utils import NumericRangeType
from sqlalchemy_utils.compat import _select_args
intervals = None
inf = 0
try:
import intervals
from infinity import inf
except ImportError:
pass
@pytest.fixture
def create_car(session, Car):
def create_car(number_range):
car = Car(
price_range=number_range
)
session.add(car)
session.commit()
return session.query(Car).first()
return create_car
@pytest.mark.skipif('intervals is None')
class NumericRangeTestCase:
@pytest.fixture
def Car(self, Base):
class Car(Base):
__tablename__ = 'car'
id = sa.Column(sa.Integer, primary_key=True)
price_range = sa.Column(NumericRangeType)
return Car
@pytest.fixture
def init_models(self, Car):
pass
def test_nullify_range(self, create_car):
car = create_car(None)
assert car.price_range is None
@pytest.mark.parametrize(
'number_range',
(
[1, 3],
(1, 3)
)
)
def test_save_number_range(self, create_car, number_range):
car = create_car(number_range)
assert car.price_range.lower == 1
assert car.price_range.upper == 3
def test_infinite_upper_bound(self, create_car):
car = create_car([1, inf])
assert car.price_range.lower == 1
assert car.price_range.upper == inf
def test_infinite_lower_bound(self, create_car):
car = create_car([-inf, 1])
assert car.price_range.lower == -inf
assert car.price_range.upper == 1
def test_nullify_number_range(self, session, Car):
car = Car(
price_range=intervals.DecimalInterval([1, 3])
)
session.add(car)
session.commit()
car = session.query(Car).first()
car.price_range = None
session.commit()
car = session.query(Car).first()
assert car.price_range is None
def test_integer_coercion(self, Car):
car = Car(price_range=15)
assert car.price_range.lower == 15
assert car.price_range.upper == 15
def test_compilation(self, session, Car):
query = sa.select(*_select_args(Car.price_range))
# the type should be cacheable and not throw exception
session.execute(query)
@pytest.mark.usefixtures('postgresql_dsn')
class TestNumericRangeOnPostgres(NumericRangeTestCase):
@pytest.mark.parametrize(
('number_range', 'length'),
(
([1, 3], 2),
([1, 1], 0),
([-1, 1], 2),
([-inf, 1], None),
([0, inf], None),
([0, 0], 0),
([-3, -1], 2)
)
)
def test_length(self, session, Car, create_car, number_range, length):
create_car(number_range)
query = (
session.query(Car.price_range.length)
)
assert query.scalar() == length
def test_literal_param(self, session, Car):
clause = Car.price_range == [1, 3]
compiled = str(clause.compile(compile_kwargs={'literal_binds': True}))
assert compiled == "car.price_range = '[1, 3]'"
@pytest.mark.skipif('intervals is None')
class TestNumericRangeWithStep:
@pytest.fixture
def Car(self, Base):
class Car(Base):
__tablename__ = 'car'
id = sa.Column(sa.Integer, primary_key=True)
price_range = sa.Column(NumericRangeType(step=Decimal('0.5')))
return Car
@pytest.fixture
def init_models(self, Car):
pass
def test_passes_step_argument_to_interval_object(self, create_car):
car = create_car([Decimal('0.2'), Decimal('0.8')])
assert car.price_range.lower == Decimal('0')
assert car.price_range.upper == Decimal('1')
assert car.price_range.step == Decimal('0.5')
def test_passes_step_fetched_objects(self, session, Car, create_car):
create_car([Decimal('0.2'), Decimal('0.8')])
session.expunge_all()
car = session.query(Car).first()
assert car.price_range.lower == Decimal('0')
assert car.price_range.upper == Decimal('1')
assert car.price_range.step == Decimal('0.5')
|
