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from django.test import TestCase
from .models import SlugPage
class RestrictedConditionsTests(TestCase):
@classmethod
def setUpTestData(cls):
slugs = [
'a',
'a/a',
'a/b',
'a/b/a',
'x',
'x/y/z',
]
SlugPage.objects.bulk_create([SlugPage(slug=slug) for slug in slugs])
def test_restrictions_with_no_joining_columns(self):
"""
It's possible to create a working related field that doesn't
use any joining columns, as long as an extra restriction is supplied.
"""
a = SlugPage.objects.get(slug='a')
self.assertEqual(
[p.slug for p in SlugPage.objects.filter(ascendants=a)],
['a', 'a/a', 'a/b', 'a/b/a'],
)
self.assertEqual(
[p.slug for p in a.descendants.all()],
['a', 'a/a', 'a/b', 'a/b/a'],
)
aba = SlugPage.objects.get(slug='a/b/a')
self.assertEqual(
[p.slug for p in SlugPage.objects.filter(descendants__in=[aba])],
['a', 'a/b', 'a/b/a'],
)
self.assertEqual(
[p.slug for p in aba.ascendants.all()],
['a', 'a/b', 'a/b/a'],
)
def test_empty_join_conditions(self):
x = SlugPage.objects.get(slug='x')
message = "Join generated an empty ON clause."
with self.assertRaisesMessage(ValueError, message):
list(SlugPage.objects.filter(containers=x))
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