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import math
from decimal import Decimal
from django.db.models import DecimalField
from django.db.models.functions import Sin
from django.test import TestCase
from ..models import DecimalModel, FloatModel, IntegerModel
class SinTests(TestCase):
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal('-12.9'), n2=Decimal('0.6'))
obj = DecimalModel.objects.annotate(n1_sin=Sin('n1'), n2_sin=Sin('n2')).first()
self.assertIsInstance(obj.n1_sin, Decimal)
self.assertIsInstance(obj.n2_sin, Decimal)
self.assertAlmostEqual(obj.n1_sin, Decimal(math.sin(obj.n1)))
self.assertAlmostEqual(obj.n2_sin, Decimal(math.sin(obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-27.5, f2=0.33)
obj = FloatModel.objects.annotate(f1_sin=Sin('f1'), f2_sin=Sin('f2')).first()
self.assertIsInstance(obj.f1_sin, float)
self.assertIsInstance(obj.f2_sin, float)
self.assertAlmostEqual(obj.f1_sin, math.sin(obj.f1))
self.assertAlmostEqual(obj.f2_sin, math.sin(obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=-20, normal=15, big=-1)
obj = IntegerModel.objects.annotate(
small_sin=Sin('small'),
normal_sin=Sin('normal'),
big_sin=Sin('big'),
).first()
self.assertIsInstance(obj.small_sin, float)
self.assertIsInstance(obj.normal_sin, float)
self.assertIsInstance(obj.big_sin, float)
self.assertAlmostEqual(obj.small_sin, math.sin(obj.small))
self.assertAlmostEqual(obj.normal_sin, math.sin(obj.normal))
self.assertAlmostEqual(obj.big_sin, math.sin(obj.big))
def test_transform(self):
try:
DecimalField.register_lookup(Sin)
DecimalModel.objects.create(n1=Decimal('5.4'), n2=Decimal('0'))
DecimalModel.objects.create(n1=Decimal('0.1'), n2=Decimal('0'))
objs = DecimalModel.objects.filter(n1__sin__lt=0)
self.assertQuerysetEqual(objs, [Decimal('5.4')], lambda a: a.n1)
finally:
DecimalField._unregister_lookup(Sin)
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