Querying for .count() on a result (len(results) will also trigger
the issue) that pulls in a FK table throws off the count. Sample
code, tests and results below:
foo/models.py
=============
from django.db import models
class Person(models.Model):
name = models.CharField(max_length=42)
# other fields
class Alias(models.Model):
person = models.ForeignKey(Person,
related_name="aliases",
)
alias = models.CharField(
max_length=40,
)
class Meta:
unique_together=(
("person", "alias"),
)
foo/tests.py
============
from django.test import TestCase
from django.db.models import Q
import foo.models as m
class SimpleTest(TestCase):
def test_basic_addition(self):
p = m.Person(name="William")
p.save()
aliases = ["Wil", "Will", "Bill", "Billy", "Willy", "Bubba"]
for alias in aliases:
a = m.Alias(person=p, alias=alias)
a.save()
for i, alias in enumerate(aliases + ["William"]):
results = m.Person.objects.filter(
Q(name__iexact=alias) |
Q(aliases__alias__iexact=alias)
)
self.assertEqual(1, results.count(),
"Failed #%i on %r" % (i, alias),)
#self.assertEqual(1, len(list(results)),
# "Failed #%i on %r" % (i, alias),)
running "./manage.py test foo" fails with this:
Creating test database for alias 'default'...
F
======================================================================
FAIL: test_basic_addition (prj.foo.tests.SimpleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/tim/code/dev/foo/tests.py", line 15, in
test_basic_addition
Q(aliases__alias__iexact="William")
AssertionError: 1 != 6 : Failed on #6 'William'
----------------------------------------------------------------------
Ran 1 test in 0.004s
FAILED (failures=1)
Destroying test database for alias 'default'...
I understand what it's doing at a SQL level, but not sure if this
is a "correct" behavior for .count() or the resulting list of
objects.
Any thoughts/suggestions?
-tkc
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