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import math
from decimal import Decimal
from django.db.models import DecimalField
from django.db.models.functions import Exp
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import DecimalModel, FloatModel, IntegerModel
class ExpTests(TestCase):
def test_null(self):
IntegerModel.objects.create()
obj = IntegerModel.objects.annotate(null_exp=Exp('normal')).first()
self.assertIsNone(obj.null_exp)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal('-12.9'), n2=Decimal('0.6'))
obj = DecimalModel.objects.annotate(n1_exp=Exp('n1'), n2_exp=Exp('n2')).first()
self.assertIsInstance(obj.n1_exp, Decimal)
self.assertIsInstance(obj.n2_exp, Decimal)
self.assertAlmostEqual(obj.n1_exp, Decimal(math.exp(obj.n1)))
self.assertAlmostEqual(obj.n2_exp, Decimal(math.exp(obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-27.5, f2=0.33)
obj = FloatModel.objects.annotate(f1_exp=Exp('f1'), f2_exp=Exp('f2')).first()
self.assertIsInstance(obj.f1_exp, float)
self.assertIsInstance(obj.f2_exp, float)
self.assertAlmostEqual(obj.f1_exp, math.exp(obj.f1))
self.assertAlmostEqual(obj.f2_exp, math.exp(obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=-20, normal=15, big=-1)
obj = IntegerModel.objects.annotate(
small_exp=Exp('small'),
normal_exp=Exp('normal'),
big_exp=Exp('big'),
).first()
self.assertIsInstance(obj.small_exp, float)
self.assertIsInstance(obj.normal_exp, float)
self.assertIsInstance(obj.big_exp, float)
self.assertAlmostEqual(obj.small_exp, math.exp(obj.small))
self.assertAlmostEqual(obj.normal_exp, math.exp(obj.normal))
self.assertAlmostEqual(obj.big_exp, math.exp(obj.big))
def test_transform(self):
with register_lookup(DecimalField, Exp):
DecimalModel.objects.create(n1=Decimal('12.0'), n2=Decimal('0'))
DecimalModel.objects.create(n1=Decimal('-1.0'), n2=Decimal('0'))
obj = DecimalModel.objects.filter(n1__exp__gt=10).get()
self.assertEqual(obj.n1, Decimal('12.0'))
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