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import math
from decimal import Decimal
from django.db.models import DecimalField
from django.db.models.functions import ASin
from django.test import TestCase
from django.test.utils import register_lookup
from ..models import DecimalModel, FloatModel, IntegerModel
class ASinTests(TestCase):
def test_null(self):
IntegerModel.objects.create()
obj = IntegerModel.objects.annotate(null_asin=ASin('normal')).first()
self.assertIsNone(obj.null_asin)
def test_decimal(self):
DecimalModel.objects.create(n1=Decimal('0.9'), n2=Decimal('0.6'))
obj = DecimalModel.objects.annotate(n1_asin=ASin('n1'), n2_asin=ASin('n2')).first()
self.assertIsInstance(obj.n1_asin, Decimal)
self.assertIsInstance(obj.n2_asin, Decimal)
self.assertAlmostEqual(obj.n1_asin, Decimal(math.asin(obj.n1)))
self.assertAlmostEqual(obj.n2_asin, Decimal(math.asin(obj.n2)))
def test_float(self):
FloatModel.objects.create(f1=-0.5, f2=0.87)
obj = FloatModel.objects.annotate(f1_asin=ASin('f1'), f2_asin=ASin('f2')).first()
self.assertIsInstance(obj.f1_asin, float)
self.assertIsInstance(obj.f2_asin, float)
self.assertAlmostEqual(obj.f1_asin, math.asin(obj.f1))
self.assertAlmostEqual(obj.f2_asin, math.asin(obj.f2))
def test_integer(self):
IntegerModel.objects.create(small=0, normal=1, big=-1)
obj = IntegerModel.objects.annotate(
small_asin=ASin('small'),
normal_asin=ASin('normal'),
big_asin=ASin('big'),
).first()
self.assertIsInstance(obj.small_asin, float)
self.assertIsInstance(obj.normal_asin, float)
self.assertIsInstance(obj.big_asin, float)
self.assertAlmostEqual(obj.small_asin, math.asin(obj.small))
self.assertAlmostEqual(obj.normal_asin, math.asin(obj.normal))
self.assertAlmostEqual(obj.big_asin, math.asin(obj.big))
def test_transform(self):
with register_lookup(DecimalField, ASin):
DecimalModel.objects.create(n1=Decimal('0.1'), n2=Decimal('0'))
DecimalModel.objects.create(n1=Decimal('1.0'), n2=Decimal('0'))
obj = DecimalModel.objects.filter(n1__asin__gt=1).get()
self.assertEqual(obj.n1, Decimal('1.0'))
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