#27990: QuerySet.count() raises ValueError when QuerySet.union() is used
-------------------------------------+-------------------------------------
Reporter: kapil | Owner: nobody
garg |
Type: Bug | Status: new
Component: Database | Version: 1.10
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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When we get objects from a model and do union then the resulted
QuerySet.count() raises ValueError due to the presence of Non-Numeric
first Field.
Eg.
{{{
class SomeModel(models.Model):
name = models.CharField(max_length=10, default='example')
>>> from bug.models import SomeModel
>>> e1 = SomeModel(name='current')
>>> e1.save()
>>> e2 = SomeModel()
>>> e2.save()
>>> qs1 = SomeModel.objects.filter(name__startswith='ex').only('name')
>>> qs2 = SomeModel.objects.filter(name__startswith='cu').only('name')
>>> qs = qs1.union(qs2)
>>> print(qs.count())
>>> #raises ValueError : invalid literal for int() with base 10
}}}
If the first field contained in queryset is numeric then this error is not
raised.
Eg. remove .only() method above on both querysets and then .count() with
return correct result.
--
Ticket URL: <https://code.djangoproject.com/ticket/27990>
Django <https://code.djangoproject.com/>
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