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92 lines
3.5 KiB
Python
92 lines
3.5 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
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from django.db.models import 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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"",
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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(
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ValueError, "Concat must take at least two expressions"
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):
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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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[
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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(
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title="The Title", text=lorem_ipsum, written=timezone.now()
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)
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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(
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Concat("title", V(" - "), "text", output_field=TextField())
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),
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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(
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len(list(pair.coalesce().flatten())), 7
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) # + 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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