mirror of
https://github.com/django/django.git
synced 2024-12-23 09:36:06 +00:00
48 lines
1.9 KiB
Python
48 lines
1.9 KiB
Python
from django.db import models
|
|
from django.db.models.expressions import Value
|
|
from django.db.models.functions import Cast
|
|
from django.test import TestCase, ignore_warnings, 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(self):
|
|
numbers = Author.objects.annotate(cast_float=Cast(0, models.FloatField()))
|
|
self.assertEqual(numbers.get().cast_float, 0.0)
|