#25972: Filtering a ForeignObject with 'isnull' lookup fails in Django 1.9
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Reporter: tomo-otsuka | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.9
Severity: Normal | Keywords: ForeignObject
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Introduced by this PR: https://github.com/django/django/pull/4036
For example, with the following models:
{{{
from django.db import models
class Author(models.Model):
id = models.IntegerField()
name = models.CharField()
class Meta:
app_label = 'foo'
class Book(models.Model):
author_id = models.IntegerField()
author_name = models.CharField()
author = models.ForeignObject(Author, models.CASCADE, ['author_id',
'author_name'], ['id', 'name'])
class Meta:
app_label = 'foo'
}}}
Running the following filter:
`Book.objects.filter(author__isnull=True).query.__str__()`
Will result in:
{{{
AttributeError: 'MultiColSource' object has no attribute 'as_sql'
> .../django/db/models/sql/compiler.py(366)compile()
365 else:
--> 366 sql, params = node.as_sql(self, self.connection)
367 if select_format and not self.subquery:
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/25972>
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