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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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