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