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119 lines
5.3 KiB
Python
119 lines
5.3 KiB
Python
import datetime
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import decimal
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import unittest
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from django.db import connection, models
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from django.db.models import Avg
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from django.db.models.expressions import Value
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from django.db.models.functions import Cast
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from django.test import (
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TestCase, ignore_warnings, override_settings, skipUnlessDBFeature,
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)
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from ..models import Author, DTModel, Fan
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class CastTests(TestCase):
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@classmethod
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def setUpTestData(self):
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Author.objects.create(name='Bob', age=1, alias='1')
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def test_cast_from_value(self):
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numbers = Author.objects.annotate(cast_integer=Cast(Value('0'), models.IntegerField()))
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self.assertEqual(numbers.get().cast_integer, 0)
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def test_cast_from_field(self):
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numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField(max_length=255)),)
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self.assertEqual(numbers.get().cast_string, '1')
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def test_cast_to_char_field_without_max_length(self):
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numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField()))
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self.assertEqual(numbers.get().cast_string, '1')
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# Silence "Truncated incorrect CHAR(1) value: 'Bob'".
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@ignore_warnings(module='django.db.backends.mysql.base')
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@skipUnlessDBFeature('supports_cast_with_precision')
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def test_cast_to_char_field_with_max_length(self):
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names = Author.objects.annotate(cast_string=Cast('name', models.CharField(max_length=1)))
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self.assertEqual(names.get().cast_string, 'B')
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def test_cast_to_integer(self):
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for field_class in (
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models.AutoField,
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models.BigAutoField,
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models.IntegerField,
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models.BigIntegerField,
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models.SmallIntegerField,
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models.PositiveIntegerField,
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models.PositiveSmallIntegerField,
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):
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with self.subTest(field_class=field_class):
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numbers = Author.objects.annotate(cast_int=Cast('alias', field_class()))
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self.assertEqual(numbers.get().cast_int, 1)
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def test_cast_from_db_datetime_to_date(self):
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dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
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DTModel.objects.create(start_datetime=dt_value)
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dtm = DTModel.objects.annotate(
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start_datetime_as_date=Cast('start_datetime', models.DateField())
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).first()
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self.assertEqual(dtm.start_datetime_as_date, datetime.date(2018, 9, 28))
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def test_cast_from_db_datetime_to_time(self):
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dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
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DTModel.objects.create(start_datetime=dt_value)
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dtm = DTModel.objects.annotate(
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start_datetime_as_time=Cast('start_datetime', models.TimeField())
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).first()
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rounded_ms = int(round(.234567, connection.features.time_cast_precision) * 10**6)
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self.assertEqual(dtm.start_datetime_as_time, datetime.time(12, 42, 10, rounded_ms))
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def test_cast_from_db_date_to_datetime(self):
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dt_value = datetime.date(2018, 9, 28)
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DTModel.objects.create(start_date=dt_value)
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dtm = DTModel.objects.annotate(start_as_datetime=Cast('start_date', models.DateTimeField())).first()
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self.assertEqual(dtm.start_as_datetime, datetime.datetime(2018, 9, 28, 0, 0, 0, 0))
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def test_cast_from_db_datetime_to_date_group_by(self):
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author = Author.objects.create(name='John Smith', age=45)
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dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
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Fan.objects.create(name='Margaret', age=50, author=author, fan_since=dt_value)
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fans = Fan.objects.values('author').annotate(
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fan_for_day=Cast('fan_since', models.DateField()),
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fans=models.Count('*')
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).values()
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self.assertEqual(fans[0]['fan_for_day'], datetime.date(2018, 9, 28))
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self.assertEqual(fans[0]['fans'], 1)
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def test_cast_from_python_to_date(self):
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today = datetime.date.today()
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dates = Author.objects.annotate(cast_date=Cast(today, models.DateField()))
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self.assertEqual(dates.get().cast_date, today)
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def test_cast_from_python_to_datetime(self):
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now = datetime.datetime.now()
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dates = Author.objects.annotate(cast_datetime=Cast(now, models.DateTimeField()))
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time_precision = datetime.timedelta(
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microseconds=10**(6 - connection.features.time_cast_precision)
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)
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self.assertAlmostEqual(dates.get().cast_datetime, now, delta=time_precision)
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def test_cast_from_python(self):
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numbers = Author.objects.annotate(cast_float=Cast(decimal.Decimal(0.125), models.FloatField()))
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cast_float = numbers.get().cast_float
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self.assertIsInstance(cast_float, float)
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self.assertEqual(cast_float, 0.125)
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@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL test')
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@override_settings(DEBUG=True)
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def test_expression_wrapped_with_parentheses_on_postgresql(self):
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"""
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The SQL for the Cast expression is wrapped with parentheses in case
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it's a complex expression.
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"""
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list(Author.objects.annotate(cast_float=Cast(Avg('age'), models.FloatField())))
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self.assertIn('(AVG("db_functions_author"."age"))::double precision', connection.queries[-1]['sql'])
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def test_cast_to_text_field(self):
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self.assertEqual(Author.objects.values_list(Cast('age', models.TextField()), flat=True).get(), '1')
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