#25290: Inconsistency between database and object instances when using
setUpTestData with related objects
---------------------------------------------+------------------------
Reporter: MarkusH | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
---------------------------------------------+------------------------
Given the following models:
{{{#!python
from django.db import models
class RelObj(models.Model):
def __repr__(self):
return '<RelObj %d at id %x>' % (self.pk, id(self))
class Obj(models.Model):
relobj = models.OneToOneField(RelObj)
name = models.CharField(max_length=10, unique=True)
val = models.IntegerField()
def __repr__(self):
return '<Obj %d at id %x>' % (self.pk, id(self))
}}}
And these tests:
{{{#!python
from django.db.utils import IntegrityError
from django.test import TestCase
from .models import Obj, RelObj
class ModelTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.relobj = RelObj.objects.create()
cls.obj = Obj.objects.create(relobj=cls.relobj, name='foo', val=1)
def test_1(self):
self.assertEqual(self.obj.relobj, self.relobj)
self.assertEqual(self.relobj.obj, self.obj)
self.assertEqual(self.obj.name, 'foo')
self.assertEqual(self.obj.val, 1)
def test_2(self):
with self.assertRaisesRegex(IntegrityError, 'app_obj_name_key'):
Obj.objects.create(relobj=self.relobj, name='foo', val=2)
def test_3(self):
self.assertEqual(self.obj.relobj, self.relobj)
self.assertEqual(self.relobj.obj, self.obj)
self.assertEqual(self.obj.name, 'foo')
self.assertEqual(self.obj.val, 1)
}}}
I get the following traceback on PostgreSQL
{{{#!python
Creating test database for alias 'default'...
..F
======================================================================
FAIL: test_3 (app.tests.ModelTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/markus/Coding/django-test-app/app/tests.py", line 26, in
test_3
self.assertEqual(self.relobj.obj, self.obj)
AssertionError: <app.models.Obj object at 0x7f579e2afe10> != <Obj 1 at id
7f579e2afc18>
----------------------------------------------------------------------
Ran 3 tests in 0.004s
FAILED (failures=1)
Destroying test database for alias 'default'...
}}}
The problem seems to be within the `Obj` creation in `test_2` which
assigns `self.relobj` / `cls.relobj` the instance of the newly created
object that couldn't be saved.
I'm on Django 1.9.dev20150818235245.
I know that I could use `refresh_from_db()`, but that seems counter
productive, given the intention of `setUpTestData()`. Using `setUp()`
instead of `setUpTestData()` also works.
--
Ticket URL: <https://code.djangoproject.com/ticket/25290>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/050.e5c256ef8addf36dbf0bd45b895ef338%40djangoproject.com.
For more options, visit https://groups.google.com/d/optout.
