73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
|
from django.db.models import TextField
|
||
|
|
from django.db.models.functions import Coalesce, Lower
|
||
|
|
from django.test import TestCase
|
||
|
|
from django.utils import timezone
|
||
|
|
|
||
|
|
from ..models import Article, Author
|
||
|
|
|
||
|
|
lorem_ipsum = """
|
||
|
|
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
|
||
|
|
tempor incididunt ut labore et dolore magna aliqua."""
|
||
|
|
|
||
|
|
|
||
|
|
class CoalesceTests(TestCase):
|
||
|
|
|
||
|
|
def test_basic(self):
|
||
|
|
Author.objects.create(name='John Smith', alias='smithj')
|
||
|
|
Author.objects.create(name='Rhonda')
|
||
|
|
authors = Author.objects.annotate(display_name=Coalesce('alias', 'name'))
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
authors.order_by('name'), ['smithj', 'Rhonda'],
|
||
|
|
lambda a: a.display_name
|
||
|
|
)
|
||
|
|
|
||
|
|
def test_gt_two_expressions(self):
|
||
|
|
with self.assertRaisesMessage(ValueError, 'Coalesce must take at least two expressions'):
|
||
|
|
Author.objects.annotate(display_name=Coalesce('alias'))
|
||
|
|
|
||
|
|
def test_mixed_values(self):
|
||
|
|
a1 = Author.objects.create(name='John Smith', alias='smithj')
|
||
|
|
a2 = Author.objects.create(name='Rhonda')
|
||
|
|
ar1 = Article.objects.create(
|
||
|
|
title='How to Django',
|
||
|
|
text=lorem_ipsum,
|
||
|
|
written=timezone.now(),
|
||
|
|
)
|
||
|
|
ar1.authors.add(a1)
|
||
|
|
ar1.authors.add(a2)
|
||
|
|
# mixed Text and Char
|
||
|
|
article = Article.objects.annotate(
|
||
|
|
headline=Coalesce('summary', 'text', output_field=TextField()),
|
||
|
|
)
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
article.order_by('title'), [lorem_ipsum],
|
||
|
|
lambda a: a.headline
|
||
|
|
)
|
||
|
|
# mixed Text and Char wrapped
|
||
|
|
article = Article.objects.annotate(
|
||
|
|
headline=Coalesce(Lower('summary'), Lower('text'), output_field=TextField()),
|
||
|
|
)
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
article.order_by('title'), [lorem_ipsum.lower()],
|
||
|
|
lambda a: a.headline
|
||
|
|
)
|
||
|
|
|
||
|
|
def test_ordering(self):
|
||
|
|
Author.objects.create(name='John Smith', alias='smithj')
|
||
|
|
Author.objects.create(name='Rhonda')
|
||
|
|
authors = Author.objects.order_by(Coalesce('alias', 'name'))
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
authors, ['Rhonda', 'John Smith'],
|
||
|
|
lambda a: a.name
|
||
|
|
)
|
||
|
|
authors = Author.objects.order_by(Coalesce('alias', 'name').asc())
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
authors, ['Rhonda', 'John Smith'],
|
||
|
|
lambda a: a.name
|
||
|
|
)
|
||
|
|
authors = Author.objects.order_by(Coalesce('alias', 'name').desc())
|
||
|
|
self.assertQuerysetEqual(
|
||
|
|
authors, ['John Smith', 'Rhonda'],
|
||
|
|
lambda a: a.name
|
||
|
|
)
|