| 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): |
| |
| 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, |
| ) |
|
|
