mirror of
https://github.com/django/django.git
synced 2024-12-26 11:06:07 +00:00
119 lines
5.3 KiB
Python
119 lines
5.3 KiB
Python
import datetime
|
|
import decimal
|
|
import unittest
|
|
|
|
from django.db import connection, models
|
|
from django.db.models import Avg
|
|
from django.db.models.expressions import Value
|
|
from django.db.models.functions import Cast
|
|
from django.test import (
|
|
TestCase, ignore_warnings, override_settings, skipUnlessDBFeature,
|
|
)
|
|
|
|
from ..models import Author, DTModel, Fan
|
|
|
|
|
|
class CastTests(TestCase):
|
|
@classmethod
|
|
def setUpTestData(self):
|
|
Author.objects.create(name='Bob', age=1, alias='1')
|
|
|
|
def test_cast_from_value(self):
|
|
numbers = Author.objects.annotate(cast_integer=Cast(Value('0'), models.IntegerField()))
|
|
self.assertEqual(numbers.get().cast_integer, 0)
|
|
|
|
def test_cast_from_field(self):
|
|
numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField(max_length=255)),)
|
|
self.assertEqual(numbers.get().cast_string, '1')
|
|
|
|
def test_cast_to_char_field_without_max_length(self):
|
|
numbers = Author.objects.annotate(cast_string=Cast('age', models.CharField()))
|
|
self.assertEqual(numbers.get().cast_string, '1')
|
|
|
|
# Silence "Truncated incorrect CHAR(1) value: 'Bob'".
|
|
@ignore_warnings(module='django.db.backends.mysql.base')
|
|
@skipUnlessDBFeature('supports_cast_with_precision')
|
|
def test_cast_to_char_field_with_max_length(self):
|
|
names = Author.objects.annotate(cast_string=Cast('name', models.CharField(max_length=1)))
|
|
self.assertEqual(names.get().cast_string, 'B')
|
|
|
|
def test_cast_to_integer(self):
|
|
for field_class in (
|
|
models.AutoField,
|
|
models.BigAutoField,
|
|
models.IntegerField,
|
|
models.BigIntegerField,
|
|
models.SmallIntegerField,
|
|
models.PositiveIntegerField,
|
|
models.PositiveSmallIntegerField,
|
|
):
|
|
with self.subTest(field_class=field_class):
|
|
numbers = Author.objects.annotate(cast_int=Cast('alias', field_class()))
|
|
self.assertEqual(numbers.get().cast_int, 1)
|
|
|
|
def test_cast_from_db_datetime_to_date(self):
|
|
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
|
|
DTModel.objects.create(start_datetime=dt_value)
|
|
dtm = DTModel.objects.annotate(
|
|
start_datetime_as_date=Cast('start_datetime', models.DateField())
|
|
).first()
|
|
self.assertEqual(dtm.start_datetime_as_date, datetime.date(2018, 9, 28))
|
|
|
|
def test_cast_from_db_datetime_to_time(self):
|
|
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
|
|
DTModel.objects.create(start_datetime=dt_value)
|
|
dtm = DTModel.objects.annotate(
|
|
start_datetime_as_time=Cast('start_datetime', models.TimeField())
|
|
).first()
|
|
rounded_ms = int(round(.234567, connection.features.time_cast_precision) * 10**6)
|
|
self.assertEqual(dtm.start_datetime_as_time, datetime.time(12, 42, 10, rounded_ms))
|
|
|
|
def test_cast_from_db_date_to_datetime(self):
|
|
dt_value = datetime.date(2018, 9, 28)
|
|
DTModel.objects.create(start_date=dt_value)
|
|
dtm = DTModel.objects.annotate(start_as_datetime=Cast('start_date', models.DateTimeField())).first()
|
|
self.assertEqual(dtm.start_as_datetime, datetime.datetime(2018, 9, 28, 0, 0, 0, 0))
|
|
|
|
def test_cast_from_db_datetime_to_date_group_by(self):
|
|
author = Author.objects.create(name='John Smith', age=45)
|
|
dt_value = datetime.datetime(2018, 9, 28, 12, 42, 10, 234567)
|
|
Fan.objects.create(name='Margaret', age=50, author=author, fan_since=dt_value)
|
|
fans = Fan.objects.values('author').annotate(
|
|
fan_for_day=Cast('fan_since', models.DateField()),
|
|
fans=models.Count('*')
|
|
).values()
|
|
self.assertEqual(fans[0]['fan_for_day'], datetime.date(2018, 9, 28))
|
|
self.assertEqual(fans[0]['fans'], 1)
|
|
|
|
def test_cast_from_python_to_date(self):
|
|
today = datetime.date.today()
|
|
dates = Author.objects.annotate(cast_date=Cast(today, models.DateField()))
|
|
self.assertEqual(dates.get().cast_date, today)
|
|
|
|
def test_cast_from_python_to_datetime(self):
|
|
now = datetime.datetime.now()
|
|
dates = Author.objects.annotate(cast_datetime=Cast(now, models.DateTimeField()))
|
|
time_precision = datetime.timedelta(
|
|
microseconds=10**(6 - connection.features.time_cast_precision)
|
|
)
|
|
self.assertAlmostEqual(dates.get().cast_datetime, now, delta=time_precision)
|
|
|
|
def test_cast_from_python(self):
|
|
numbers = Author.objects.annotate(cast_float=Cast(decimal.Decimal(0.125), models.FloatField()))
|
|
cast_float = numbers.get().cast_float
|
|
self.assertIsInstance(cast_float, float)
|
|
self.assertEqual(cast_float, 0.125)
|
|
|
|
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL test')
|
|
@override_settings(DEBUG=True)
|
|
def test_expression_wrapped_with_parentheses_on_postgresql(self):
|
|
"""
|
|
The SQL for the Cast expression is wrapped with parentheses in case
|
|
it's a complex expression.
|
|
"""
|
|
list(Author.objects.annotate(cast_float=Cast(Avg('age'), models.FloatField())))
|
|
self.assertIn('(AVG("db_functions_author"."age"))::double precision', connection.queries[-1]['sql'])
|
|
|
|
def test_cast_to_text_field(self):
|
|
self.assertEqual(Author.objects.values_list(Cast('age', models.TextField()), flat=True).get(), '1')
|