| import math |
| from decimal import Decimal |
|
|
| from django.db.models.functions import Log |
| from django.test import TestCase |
|
|
| from ..models import DecimalModel, FloatModel, IntegerModel |
|
|
|
|
| class LogTests(TestCase): |
| def test_null(self): |
| IntegerModel.objects.create(big=100) |
| obj = IntegerModel.objects.annotate( |
| null_log_small=Log("small", "normal"), |
| null_log_normal=Log("normal", "big"), |
| null_log_big=Log("big", "normal"), |
| ).first() |
| self.assertIsNone(obj.null_log_small) |
| self.assertIsNone(obj.null_log_normal) |
| self.assertIsNone(obj.null_log_big) |
|
|
| def test_decimal(self): |
| DecimalModel.objects.create(n1=Decimal("12.9"), n2=Decimal("3.6")) |
| obj = DecimalModel.objects.annotate(n_log=Log("n1", "n2")).first() |
| self.assertIsInstance(obj.n_log, Decimal) |
| self.assertAlmostEqual(obj.n_log, Decimal(math.log(obj.n2, obj.n1))) |
|
|
| def test_float(self): |
| FloatModel.objects.create(f1=2.0, f2=4.0) |
| obj = FloatModel.objects.annotate(f_log=Log("f1", "f2")).first() |
| self.assertIsInstance(obj.f_log, float) |
| self.assertAlmostEqual(obj.f_log, math.log(obj.f2, obj.f1)) |
|
|
| def test_integer(self): |
| IntegerModel.objects.create(small=4, normal=8, big=2) |
| obj = IntegerModel.objects.annotate( |
| small_log=Log("small", "big"), |
| normal_log=Log("normal", "big"), |
| big_log=Log("big", "big"), |
| ).first() |
| self.assertIsInstance(obj.small_log, float) |
| self.assertIsInstance(obj.normal_log, float) |
| self.assertIsInstance(obj.big_log, float) |
| self.assertAlmostEqual(obj.small_log, math.log(obj.big, obj.small)) |
| self.assertAlmostEqual(obj.normal_log, math.log(obj.big, obj.normal)) |
| self.assertAlmostEqual(obj.big_log, math.log(obj.big, obj.big)) |
|
|
