| import unittest |
| from decimal import Decimal |
|
|
| from django.db import connection |
| from django.db.models import DecimalField |
| from django.db.models.functions import Pi, Round |
| from django.test import TestCase |
| from django.test.utils import register_lookup |
|
|
| from ..models import DecimalModel, FloatModel, IntegerModel |
|
|
|
|
| class RoundTests(TestCase): |
| def test_null(self): |
| IntegerModel.objects.create() |
| obj = IntegerModel.objects.annotate(null_round=Round("normal")).first() |
| self.assertIsNone(obj.null_round) |
|
|
| def test_null_with_precision(self): |
| IntegerModel.objects.create() |
| obj = IntegerModel.objects.annotate(null_round=Round("normal", 5)).first() |
| self.assertIsNone(obj.null_round) |
|
|
| def test_null_with_negative_precision(self): |
| IntegerModel.objects.create() |
| obj = IntegerModel.objects.annotate(null_round=Round("normal", -1)).first() |
| self.assertIsNone(obj.null_round) |
|
|
| def test_decimal(self): |
| DecimalModel.objects.create(n1=Decimal("-12.9"), n2=Decimal("0.6")) |
| obj = DecimalModel.objects.annotate( |
| n1_round=Round("n1"), n2_round=Round("n2") |
| ).first() |
| self.assertIsInstance(obj.n1_round, Decimal) |
| self.assertIsInstance(obj.n2_round, Decimal) |
| self.assertAlmostEqual(obj.n1_round, obj.n1, places=0) |
| self.assertAlmostEqual(obj.n2_round, obj.n2, places=0) |
|
|
| def test_decimal_with_precision(self): |
| DecimalModel.objects.create(n1=Decimal("-5.75"), n2=Pi()) |
| obj = DecimalModel.objects.annotate( |
| n1_round=Round("n1", 1), |
| n2_round=Round("n2", 5), |
| ).first() |
| self.assertIsInstance(obj.n1_round, Decimal) |
| self.assertIsInstance(obj.n2_round, Decimal) |
| self.assertAlmostEqual(obj.n1_round, obj.n1, places=1) |
| self.assertAlmostEqual(obj.n2_round, obj.n2, places=5) |
|
|
| def test_decimal_with_negative_precision(self): |
| DecimalModel.objects.create(n1=Decimal("365.25")) |
| obj = DecimalModel.objects.annotate(n1_round=Round("n1", -1)).first() |
| self.assertIsInstance(obj.n1_round, Decimal) |
| self.assertEqual(obj.n1_round, 370) |
|
|
| def test_float(self): |
| FloatModel.objects.create(f1=-27.55, f2=0.55) |
| obj = FloatModel.objects.annotate( |
| f1_round=Round("f1"), f2_round=Round("f2") |
| ).first() |
| self.assertIsInstance(obj.f1_round, float) |
| self.assertIsInstance(obj.f2_round, float) |
| self.assertAlmostEqual(obj.f1_round, obj.f1, places=0) |
| self.assertAlmostEqual(obj.f2_round, obj.f2, places=0) |
|
|
| def test_float_with_precision(self): |
| FloatModel.objects.create(f1=-5.75, f2=Pi()) |
| obj = FloatModel.objects.annotate( |
| f1_round=Round("f1", 1), |
| f2_round=Round("f2", 5), |
| ).first() |
| self.assertIsInstance(obj.f1_round, float) |
| self.assertIsInstance(obj.f2_round, float) |
| self.assertAlmostEqual(obj.f1_round, obj.f1, places=1) |
| self.assertAlmostEqual(obj.f2_round, obj.f2, places=5) |
|
|
| def test_float_with_negative_precision(self): |
| FloatModel.objects.create(f1=365.25) |
| obj = FloatModel.objects.annotate(f1_round=Round("f1", -1)).first() |
| self.assertIsInstance(obj.f1_round, float) |
| self.assertEqual(obj.f1_round, 370) |
|
|
| def test_integer(self): |
| IntegerModel.objects.create(small=-20, normal=15, big=-1) |
| obj = IntegerModel.objects.annotate( |
| small_round=Round("small"), |
| normal_round=Round("normal"), |
| big_round=Round("big"), |
| ).first() |
| self.assertIsInstance(obj.small_round, int) |
| self.assertIsInstance(obj.normal_round, int) |
| self.assertIsInstance(obj.big_round, int) |
| self.assertAlmostEqual(obj.small_round, obj.small, places=0) |
| self.assertAlmostEqual(obj.normal_round, obj.normal, places=0) |
| self.assertAlmostEqual(obj.big_round, obj.big, places=0) |
|
|
| def test_integer_with_precision(self): |
| IntegerModel.objects.create(small=-5, normal=3, big=-100) |
| obj = IntegerModel.objects.annotate( |
| small_round=Round("small", 1), |
| normal_round=Round("normal", 5), |
| big_round=Round("big", 2), |
| ).first() |
| self.assertIsInstance(obj.small_round, int) |
| self.assertIsInstance(obj.normal_round, int) |
| self.assertIsInstance(obj.big_round, int) |
| self.assertAlmostEqual(obj.small_round, obj.small, places=1) |
| self.assertAlmostEqual(obj.normal_round, obj.normal, places=5) |
| self.assertAlmostEqual(obj.big_round, obj.big, places=2) |
|
|
| def test_integer_with_negative_precision(self): |
| IntegerModel.objects.create(normal=365) |
| obj = IntegerModel.objects.annotate(normal_round=Round("normal", -1)).first() |
| self.assertIsInstance(obj.normal_round, int) |
| self.assertEqual(obj.normal_round, 370) |
|
|
| def test_transform(self): |
| with register_lookup(DecimalField, Round): |
| DecimalModel.objects.create(n1=Decimal("2.0"), n2=Decimal("0")) |
| DecimalModel.objects.create(n1=Decimal("-1.0"), n2=Decimal("0")) |
| obj = DecimalModel.objects.filter(n1__round__gt=0).get() |
| self.assertEqual(obj.n1, Decimal("2.0")) |
|
|
| @unittest.skipUnless( |
| connection.vendor == "sqlite", |
| "SQLite doesn't support negative precision.", |
| ) |
| def test_unsupported_negative_precision(self): |
| FloatModel.objects.create(f1=123.45) |
| msg = "SQLite does not support negative precision." |
| with self.assertRaisesMessage(ValueError, msg): |
| FloatModel.objects.annotate(value=Round("f1", -1)).first() |
|
|
