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from django.db.models import F, Value
from django.db.models.functions import Concat, Replace
from django.test import TestCase
from ..models import Author
class ReplaceTests(TestCase):
@classmethod
def setUpTestData(cls):
Author.objects.create(name='George R. R. Martin')
Author.objects.create(name='J. R. R. Tolkien')
def test_replace_with_empty_string(self):
qs = Author.objects.annotate(
without_middlename=Replace(F('name'), Value('R. R. '), Value('')),
)
self.assertQuerysetEqual(qs, [
('George R. R. Martin', 'George Martin'),
('J. R. R. Tolkien', 'J. Tolkien'),
], transform=lambda x: (x.name, x.without_middlename), ordered=False)
def test_case_sensitive(self):
qs = Author.objects.annotate(same_name=Replace(F('name'), Value('r. r.'), Value('')))
self.assertQuerysetEqual(qs, [
('George R. R. Martin', 'George R. R. Martin'),
('J. R. R. Tolkien', 'J. R. R. Tolkien'),
], transform=lambda x: (x.name, x.same_name), ordered=False)
def test_replace_expression(self):
qs = Author.objects.annotate(same_name=Replace(
Concat(Value('Author: '), F('name')), Value('Author: '), Value('')),
)
self.assertQuerysetEqual(qs, [
('George R. R. Martin', 'George R. R. Martin'),
('J. R. R. Tolkien', 'J. R. R. Tolkien'),
], transform=lambda x: (x.name, x.same_name), ordered=False)
def test_update(self):
Author.objects.update(
name=Replace(F('name'), Value('R. R. '), Value('')),
)
self.assertQuerysetEqual(Author.objects.all(), [
('George Martin'),
('J. Tolkien'),
], transform=lambda x: x.name, ordered=False)
def test_replace_with_default_arg(self):
# The default replacement is an empty string.
qs = Author.objects.annotate(same_name=Replace(F('name'), Value('R. R. ')))
self.assertQuerysetEqual(qs, [
('George R. R. Martin', 'George Martin'),
('J. R. R. Tolkien', 'J. Tolkien'),
], transform=lambda x: (x.name, x.same_name), ordered=False)
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