314 lines
10 KiB
Python
314 lines
10 KiB
Python
from __future__ import unicode_literals
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from django.db.models import TextField, CharField, Value as V
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from django.db.models.functions import (
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Coalesce, Concat, Lower, Upper, Length, Substr,
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)
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from django.test import TestCase
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from django.utils import six, timezone
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from .models import Author, Article
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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 FunctionTests(TestCase):
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def test_coalesce(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(display_name=Coalesce('alias', 'name'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'smithj',
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'Rhonda',
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],
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lambda a: a.display_name
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)
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with self.assertRaisesMessage(ValueError, 'Coalesce must take at least two expressions'):
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Author.objects.annotate(display_name=Coalesce('alias'))
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def test_coalesce_mixed_values(self):
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a1 = Author.objects.create(name='John Smith', alias='smithj')
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a2 = Author.objects.create(name='Rhonda')
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ar1 = Article.objects.create(
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title="How to Django",
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text=lorem_ipsum,
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written=timezone.now(),
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)
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ar1.authors.add(a1)
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ar1.authors.add(a2)
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# mixed Text and Char
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article = Article.objects.annotate(
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headline=Coalesce('summary', 'text', output_field=TextField()),
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)
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self.assertQuerysetEqual(
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article.order_by('title'), [
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lorem_ipsum,
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],
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lambda a: a.headline
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)
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# mixed Text and Char wrapped
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article = Article.objects.annotate(
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headline=Coalesce(Lower('summary'), Lower('text'), output_field=TextField()),
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)
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self.assertQuerysetEqual(
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article.order_by('title'), [
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lorem_ipsum.lower(),
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],
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lambda a: a.headline
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)
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def test_coalesce_ordering(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.order_by(Coalesce('alias', 'name'))
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self.assertQuerysetEqual(
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authors, [
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'Rhonda',
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'John Smith',
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],
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lambda a: a.name
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)
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authors = Author.objects.order_by(Coalesce('alias', 'name').asc())
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self.assertQuerysetEqual(
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authors, [
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'Rhonda',
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'John Smith',
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],
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lambda a: a.name
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)
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authors = Author.objects.order_by(Coalesce('alias', 'name').desc())
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self.assertQuerysetEqual(
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authors, [
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'John Smith',
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'Rhonda',
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],
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lambda a: a.name
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)
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def test_concat(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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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_concat_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_concat_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 we're still
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# getting text 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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def test_lower(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(lower_name=Lower('name'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'john smith',
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'rhonda',
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],
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lambda a: a.lower_name
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)
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Author.objects.update(name=Lower('name'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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('john smith', 'john smith'),
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('rhonda', 'rhonda'),
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],
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lambda a: (a.lower_name, a.name)
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)
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def test_upper(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(upper_name=Upper('name'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'JOHN SMITH',
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'RHONDA',
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],
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lambda a: a.upper_name
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)
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Author.objects.update(name=Upper('name'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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('JOHN SMITH', 'JOHN SMITH'),
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('RHONDA', 'RHONDA'),
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],
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lambda a: (a.upper_name, a.name)
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)
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def test_length(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(
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name_length=Length('name'),
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alias_length=Length('alias'))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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(10, 6),
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(6, None),
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],
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lambda a: (a.name_length, a.alias_length)
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)
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self.assertEqual(authors.filter(alias_length__lte=Length('name')).count(), 1)
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def test_length_ordering(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='John Smith', alias='smithj1')
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Author.objects.create(name='Rhonda', alias='ronny')
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authors = Author.objects.order_by(Length('name'), Length('alias'))
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self.assertQuerysetEqual(
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authors, [
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('Rhonda', 'ronny'),
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('John Smith', 'smithj'),
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('John Smith', 'smithj1'),
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],
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lambda a: (a.name, a.alias)
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)
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def test_substr(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(name_part=Substr('name', 5, 3))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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' Sm',
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'da',
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],
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lambda a: a.name_part
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)
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authors = Author.objects.annotate(name_part=Substr('name', 2))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'ohn Smith',
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'honda',
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],
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lambda a: a.name_part
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)
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# if alias is null, set to first 5 lower characters of the name
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Author.objects.filter(alias__isnull=True).update(
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alias=Lower(Substr('name', 1, 5)),
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)
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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'smithj',
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'rhond',
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],
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lambda a: a.alias
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)
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def test_substr_start(self):
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Author.objects.create(name='John Smith', alias='smithj')
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a = Author.objects.annotate(
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name_part_1=Substr('name', 1),
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name_part_2=Substr('name', 2),
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).get(alias='smithj')
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self.assertEqual(a.name_part_1[1:], a.name_part_2)
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with six.assertRaisesRegex(self, ValueError, "'pos' must be greater than 0"):
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Author.objects.annotate(raises=Substr('name', 0))
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def test_substr_with_expressions(self):
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Author.objects.create(name='John Smith', alias='smithj')
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Author.objects.create(name='Rhonda')
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authors = Author.objects.annotate(name_part=Substr('name', V(5), V(3)))
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self.assertQuerysetEqual(
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authors.order_by('name'), [
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' Sm',
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'da',
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],
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lambda a: a.name_part
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)
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def test_nested_function_ordering(self):
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Author.objects.create(name='John Smith')
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Author.objects.create(name='Rhonda Simpson', alias='ronny')
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authors = Author.objects.order_by(Length(Coalesce('alias', 'name')))
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self.assertQuerysetEqual(
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authors, [
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'Rhonda Simpson',
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'John Smith',
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],
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lambda a: a.name
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)
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authors = Author.objects.order_by(Length(Coalesce('alias', 'name')).desc())
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self.assertQuerysetEqual(
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authors, [
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'John Smith',
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'Rhonda Simpson',
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],
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lambda a: a.name
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)
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