#7791: len() on queryset with distinct ordered by child's field crashes
------------------------------+---------------------------------------------
Reporter: isagalaev | Owner: mtredinnick
Status: new | Milestone:
Component: Database wrapper | Version: SVN
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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Given this model:
{{{
#!python
class Restaurant(models.Model):
title = models.CharField(max_length=50)
class Pizza(models.Model):
restaurant = models.ForeignKey(Restaurant)
title = models.CharField(max_length=50)
}}}
and this data (one test record for each model):
{{{
[
{
"pk": 1,
"model": "main.restaurant",
"fields": {
"title": "Karlo"
}
},
{
"pk": 1,
"model": "main.pizza",
"fields": {
"title": "Margherita",
"restaurant": 1
}
}
]
}}}
calling len() on a queryset with distinct ordered by child's field:
{{{
#!python
len(Restaurant.objects.order_by('pizza__title').distinct())
}}}
gives this traceback:
{{{
Traceback (most recent call last):
File "./manage.py", line 13, in <module>
len(Restaurant.objects.order_by('pizza__title').distinct())
File "/home/isagalaev/py/django/db/models/query.py", line 153, in
__len__
self._result_cache = list(self.iterator())
File "/home/isagalaev/py/django/db/models/query.py", line 273, in
iterator
obj = self.model(*row[index_start:])
File "/home/isagalaev/py/django/db/models/base.py", line 184, in
__init__
raise IndexError("Number of args exceeds number of fields")
IndexError: Number of args exceeds number of fields
}}}
--
Ticket URL: <http://code.djangoproject.com/ticket/7791>
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