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Fixed #34606 -- Fixed Right() function with zero length on Oracle and SQLite.

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Kacper Wolkiewicz 2023-05-31 12:57:40 +02:00 committed by GitHub
parent b0a6cc7f57
commit 91be6e1818
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3 changed files with 21 additions and 2 deletions
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1
AUTHORS
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@ -545,6 +545,7 @@ answer newbie questions, and generally made Django that much better:
Justin Michalicek <jmichalicek@gmail.com>
Justin Myles Holmes <justin@slashrootcafe.com>
Jyrki Pulliainen <jyrki.pulliainen@gmail.com>
Kacper Wolkiewicz <kac.wolkiewicz@gmail.com>
Kadesarin Sanjek
Kapil Bansal <kapilbansal.gbpecdelhi@gmail.com>
Karderio <karderio@gmail.com>

4
django/db/models/functions/text.py
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@ -276,7 +276,9 @@ class Right(Left):
def get_substr(self):
return Substr(
self.source_expressions[0], self.source_expressions[1] * Value(-1)
self.source_expressions[0],
self.source_expressions[1] * Value(-1),
self.source_expressions[1],
)

18
tests/db_functions/text/test_right.py
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@ -1,5 +1,6 @@
from django.db import connection
from django.db.models import IntegerField, Value
from django.db.models.functions import Lower, Right
from django.db.models.functions import Length, Lower, Right
from django.test import TestCase
from ..models import Author
@ -26,6 +27,21 @@ class RightTests(TestCase):
with self.assertRaisesMessage(ValueError, "'length' must be greater than 0"):
Author.objects.annotate(raises=Right("name", 0))
def test_zero_length(self):
Author.objects.create(name="Tom", alias="tom")
authors = Author.objects.annotate(
name_part=Right("name", Length("name") - Length("alias"))
)
self.assertQuerySetEqual(
authors.order_by("name"),
[
"mith",
"" if connection.features.interprets_empty_strings_as_nulls else None,
"",
],
lambda a: a.name_part,
)
def test_expressions(self):
authors = Author.objects.annotate(
name_part=Right("name", Value(3, output_field=IntegerField()))