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82 lines
3.3 KiB
Python
82 lines
3.3 KiB
Python
from unittest import skipUnless
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from django.db import connection
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from django.db.models import CharField, TextField, Value as V
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from django.db.models.functions import Concat, ConcatPair, Upper
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from django.test import TestCase
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from django.utils import timezone
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from ..models import Article, Author
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lorem_ipsum = """
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Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
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tempor incididunt ut labore et dolore magna aliqua."""
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class ConcatTests(TestCase):
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def test_basic(self):
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Author.objects.create(name='Jayden')
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Author.objects.create(name='John Smith', alias='smithj', goes_by='John')
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Author.objects.create(name='Margaret', goes_by='Maggie')
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Author.objects.create(name='Rhonda', alias='adnohR')
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authors = Author.objects.annotate(joined=Concat('alias', 'goes_by'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'',
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'smithjJohn',
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'Maggie',
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'adnohR',
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],
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lambda a: a.joined
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)
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def test_gt_two_expressions(self):
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with self.assertRaisesMessage(ValueError, 'Concat must take at least two expressions'):
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Author.objects.annotate(joined=Concat('alias'))
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def test_many(self):
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Author.objects.create(name='Jayden')
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Author.objects.create(name='John Smith', alias='smithj', goes_by='John')
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Author.objects.create(name='Margaret', goes_by='Maggie')
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Author.objects.create(name='Rhonda', alias='adnohR')
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authors = Author.objects.annotate(
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joined=Concat('name', V(' ('), 'goes_by', V(')'), output_field=CharField()),
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)
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'Jayden ()',
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'John Smith (John)',
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'Margaret (Maggie)',
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'Rhonda ()',
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],
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lambda a: a.joined
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)
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def test_mixed_char_text(self):
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Article.objects.create(title='The Title', text=lorem_ipsum, written=timezone.now())
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article = Article.objects.annotate(
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title_text=Concat('title', V(' - '), 'text', output_field=TextField()),
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).get(title='The Title')
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self.assertEqual(article.title + ' - ' + article.text, article.title_text)
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# Wrap the concat in something else to ensure that text is returned
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# rather than bytes.
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article = Article.objects.annotate(
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title_text=Upper(Concat('title', V(' - '), 'text', output_field=TextField())),
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).get(title='The Title')
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expected = article.title + ' - ' + article.text
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self.assertEqual(expected.upper(), article.title_text)
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@skipUnless(connection.vendor == 'sqlite', "sqlite specific implementation detail.")
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def test_coalesce_idempotent(self):
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pair = ConcatPair(V('a'), V('b'))
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# Check nodes counts
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self.assertEqual(len(list(pair.flatten())), 3)
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self.assertEqual(len(list(pair.coalesce().flatten())), 7) # + 2 Coalesce + 2 Value()
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self.assertEqual(len(list(pair.flatten())), 3)
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def test_sql_generation_idempotency(self):
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qs = Article.objects.annotate(description=Concat('title', V(': '), 'summary'))
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# Multiple compilations should not alter the generated query.
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self.assertEqual(str(qs.query), str(qs.all().query))
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