1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
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'),
).first()
self.assertIsNone(obj.null_log_small)
self.assertIsNone(obj.null_log_normal)
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))
|
