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Refs #28643 -- Added Repeat database function.

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Thanks Tim Graham and Nick Pope for reviews.
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Mariusz Felisiak 2018-04-03 19:36:12 +02:00 • committed by GitHub
parent 6141c752fe
commit 55cc26941a
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6 changed files with 64 additions and 4 deletions
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tests/db_functions/test_repeat.py Normal file
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from django.db.models import CharField, Value
from django.db.models.functions import Length, Repeat
from django.test import TestCase
from .models import Author
class RepeatTests(TestCase):
def test_basic(self):
Author.objects.create(name='John', alias='xyz')
tests = (
(Repeat('name', 0), ''),
(Repeat('name', 2), 'JohnJohn'),
(Repeat('name', Length('alias'), output_field=CharField()), 'JohnJohnJohn'),
(Repeat(Value('x'), 3, output_field=CharField()), 'xxx'),
)
for function, repeated_text in tests:
with self.subTest(function=function):
authors = Author.objects.annotate(repeated_text=function)
self.assertQuerysetEqual(authors, [repeated_text], lambda a: a.repeated_text, ordered=False)
def test_negative_number(self):
with self.assertRaisesMessage(ValueError, "'number' must be greater or equal to 0."):
Repeat('name', -1)