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