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Refs #32858, Refs #32392 -- Restored using :: shortcut syntax in Cast() on PostgreSQL.

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This partly reverts commit fdfbc66331
unnecessary since b69b0c3fe8.
This commit is contained in:
Mariusz Felisiak 2021-06-22 06:10:54 +02:00
parent b69b0c3fe8
commit e07609a0d1
3 changed files with 24 additions and 1 deletions
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17
tests/db_functions/comparison/test_cast.py
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@ -1,9 +1,11 @@
import datetime
import decimal
import unittest
from django.db import connection, models
from django.db.models.functions import Cast
from django.test import TestCase, ignore_warnings, skipUnlessDBFeature
from django.test.utils import CaptureQueriesContext
from ..models import Author, DTModel, Fan, FloatModel
@ -125,5 +127,20 @@ class CastTests(TestCase):
self.assertIsInstance(cast_float, float)
self.assertEqual(cast_float, 0.125)
@unittest.skipUnless(connection.vendor == 'postgresql', 'PostgreSQL test')
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.
"""
with CaptureQueriesContext(connection) as captured_queries:
list(Author.objects.annotate(
cast_float=Cast(models.Avg('age'), models.FloatField()),
))
self.assertIn(
'(AVG("db_functions_author"."age"))::double precision',
captured_queries[0]['sql'],
)
def test_cast_to_text_field(self):
self.assertEqual(Author.objects.values_list(Cast('age', models.TextField()), flat=True).get(), '1')