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from django.db import connection
from django.db.models import 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')
none_value = '' if connection.features.interprets_empty_strings_as_nulls else None
tests = (
(Repeat('name', 0), ''),
(Repeat('name', 2), 'JohnJohn'),
(Repeat('name', Length('alias')), 'JohnJohnJohn'),
(Repeat(Value('x'), 3), 'xxx'),
(Repeat('name', None), none_value),
(Repeat(Value(None), 4), none_value),
(Repeat('goes_by', 1), none_value),
)
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)
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