#31221: HStoreField returns str instead of dict during tests
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Reporter: Michael Mulholland | Owner: (none)
Type: Uncategorized | Status: new
Component: contrib.postgres | Version: 2.2
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 |
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It appears that while running tests on my app, the behavior of HStoreField
is not consistent. The TestCase I am trying to run is to test a script
(which normally runs fine as a management command) that crashes upon
trying to use metadata in an HStoreField. Model instances for testing are
loaded from a fixture.
While debugging the test, I've found that accessing an HStoreField on a
model instance will return a str type instead of the expected dict. What's
stranger is that this doesn't occur when the test database already exists
and --keepdb is used (the first run with --keepdb will fail, but the
second doesn't). This leads me to believe that the way fixtures are loaded
during testing is breaking HStoreField's to_python conversion or
something.
I found a similar issue #25454, where the same problem was solved, but it
looks like the problem is either occurring under different circumstances
or has been reintroduced.
My test runner is from this gist, where the test db is created with hstore
extension installed:
[https://gist.github.com/smcoll/bb2533e4b53ae570e11eb2ab011b887b]
Currently my knowledge of the django code base isn't extensive enough to
suggest a fix, but I have been able to reproduce this problem with the
following models/tests:
{{{
# models.py
class MyModel(models.Model):
name = models.CharField(max_length=66)
metadata = HStoreField(blank=True)
}}}
{{{
# tests.py
class TestMyApp(TestCase):
fixtures = ['i_myapp']
def test_mymodel(self):
for mymodel_instance in MyModel.objects.all():
self.assertEqual(type(mymodel_instance.metadata), dict)
}}}
{{{
# i_myapp.json
[
{
"model": "myapp.mymodel",
"pk": 4,
"fields": {
"name": "First",
"metadata": "{}"
}
},
{
"model": "myapp.mymodel",
"pk": 5,
"fields": {
"name": "Second",
"metadata": "{\"details\": \"this one isn't blank\"}"
}
}
]
}}}
The test test_mymodel fails with:
{{{
AssertionError: <class 'str'> != <class 'dict'>
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/31221>
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