| 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")) |
|
|
