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import math
from decimal import Decimal
from django.db.models import DecimalField
from django.db.models.functions import ATan
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import DecimalModel, FloatModel, IntegerModel
class ATanTests(TestCase):
def test_null(self):
IntegerModel.objects.create()
obj = IntegerModel.objects.annotate(null_atan=ATan('normal')).first()
self.assertIsNone(obj.null_atan)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal('-12.9'), n2=Decimal('0.6'))
obj = DecimalModel.objects.annotate(n1_atan=ATan('n1'), n2_atan=ATan('n2')).first()
self.assertIsInstance(obj.n1_atan, Decimal)
self.assertIsInstance(obj.n2_atan, Decimal)
self.assertAlmostEqual(obj.n1_atan, Decimal(math.atan(obj.n1)))
self.assertAlmostEqual(obj.n2_atan, Decimal(math.atan(obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-27.5, f2=0.33)
obj = FloatModel.objects.annotate(f1_atan=ATan('f1'), f2_atan=ATan('f2')).first()
self.assertIsInstance(obj.f1_atan, float)
self.assertIsInstance(obj.f2_atan, float)
self.assertAlmostEqual(obj.f1_atan, math.atan(obj.f1))
self.assertAlmostEqual(obj.f2_atan, math.atan(obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=-20, normal=15, big=-1)
obj = IntegerModel.objects.annotate(
small_atan=ATan('small'),
normal_atan=ATan('normal'),
big_atan=ATan('big'),
).first()
self.assertIsInstance(obj.small_atan, float)
self.assertIsInstance(obj.normal_atan, float)
self.assertIsInstance(obj.big_atan, float)
self.assertAlmostEqual(obj.small_atan, math.atan(obj.small))
self.assertAlmostEqual(obj.normal_atan, math.atan(obj.normal))
self.assertAlmostEqual(obj.big_atan, math.atan(obj.big))
def test_transform(self):
with register_lookup(DecimalField, ATan):
DecimalModel.objects.create(n1=Decimal('3.12'), n2=Decimal('0'))
DecimalModel.objects.create(n1=Decimal('-5'), n2=Decimal('0'))
obj = DecimalModel.objects.filter(n1__atan__gt=0).get()
self.assertEqual(obj.n1, Decimal('3.12'))
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