mirror of https://github.com/django/django.git
52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
|
import math
|
||
|
|
from decimal import Decimal
|
||
|
|
|
||
|
|
from django.db.models import DecimalField
|
||
|
|
from django.db.models.functions import Ln
|
||
|
|
from django.test import TestCase
|
||
|
|
|
||
|
|
from ..models import DecimalModel, FloatModel, IntegerModel
|
||
|
|
|
||
|
|
|
||
|
|
class LnTests(TestCase):
|
||
|
|
|
||
|
|
def test_decimal(self):
|
||
|
|
DecimalModel.objects.create(n1=Decimal('12.9'), n2=Decimal('0.6'))
|
||
|
|
obj = DecimalModel.objects.annotate(n1_ln=Ln('n1'), n2_ln=Ln('n2')).first()
|
||
|
|
self.assertIsInstance(obj.n1_ln, Decimal)
|
||
|
|
self.assertIsInstance(obj.n2_ln, Decimal)
|
||
|
|
self.assertAlmostEqual(obj.n1_ln, Decimal(math.log(obj.n1)))
|
||
|
|
self.assertAlmostEqual(obj.n2_ln, Decimal(math.log(obj.n2)))
|
||
|
|
|
||
|
|
def test_float(self):
|
||
|
|
FloatModel.objects.create(f1=27.5, f2=0.33)
|
||
|
|
obj = FloatModel.objects.annotate(f1_ln=Ln('f1'), f2_ln=Ln('f2')).first()
|
||
|
|
self.assertIsInstance(obj.f1_ln, float)
|
||
|
|
self.assertIsInstance(obj.f2_ln, float)
|
||
|
|
self.assertAlmostEqual(obj.f1_ln, math.log(obj.f1))
|
||
|
|
self.assertAlmostEqual(obj.f2_ln, math.log(obj.f2))
|
||
|
|
|
||
|
|
def test_integer(self):
|
||
|
|
IntegerModel.objects.create(small=20, normal=15, big=1)
|
||
|
|
obj = IntegerModel.objects.annotate(
|
||
|
|
small_ln=Ln('small'),
|
||
|
|
normal_ln=Ln('normal'),
|
||
|
|
big_ln=Ln('big'),
|
||
|
|
).first()
|
||
|
|
self.assertIsInstance(obj.small_ln, float)
|
||
|
|
self.assertIsInstance(obj.normal_ln, float)
|
||
|
|
self.assertIsInstance(obj.big_ln, float)
|
||
|
|
self.assertAlmostEqual(obj.small_ln, math.log(obj.small))
|
||
|
|
self.assertAlmostEqual(obj.normal_ln, math.log(obj.normal))
|
||
|
|
self.assertAlmostEqual(obj.big_ln, math.log(obj.big))
|
||
|
|
|
||
|
|
def test_transform(self):
|
||
|
|
try:
|
||
|
|
DecimalField.register_lookup(Ln)
|
||
|
|
DecimalModel.objects.create(n1=Decimal('12.0'), n2=Decimal('0'))
|
||
|
|
DecimalModel.objects.create(n1=Decimal('1.0'), n2=Decimal('0'))
|
||
|
|
objs = DecimalModel.objects.filter(n1__ln__gt=0)
|
||
|
|
self.assertQuerysetEqual(objs, [Decimal('12.0')], lambda a: a.n1)
|
||
|
|
finally:
|
||
|
|
DecimalField._unregister_lookup(Ln)
|