mirror of
https://github.com/django/django.git
synced 2025-10-31 09:41:08 +00:00
80 lines
3.2 KiB
Python
80 lines
3.2 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
|
|
|
|
|
|
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.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_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()))
|
|
self.assertEqual(dates.get().cast_datetime, now)
|
|
|
|
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')
|