#16316: Error with GenericRelation applied to a subclass
----------------------------+----------------------------------------------
Reporter: jordanreiter@… | Owner: nobody
Type: Bug | Status: new
Milestone: | Component: Database layer (models, ORM)
Version: 1.3 | Severity: Normal
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Easy pickings: 0
UI/UX: 0 |
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I noticed this when using the django-threadedcomments app and trying to
add a `GenericRelation` pointing to the `ThreadedComment` model. I would
assume this holds true for any model that subclasses a model with generic
foreign keys.
{{{
class Discussion(models.Model):
title = models.CharField(max_length=100, help_text='Enter a
descriptive title for this discussion.')
content = models.TextField(null=True, blank=True)
date = models.DateTimeField()
comments = generic.GenericRelation(ThreadedComment)
}}}
And then
{{{
>>> Discussion.objects.filter(comments__isnull=False)
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/path/to/django/db/models/query.py", line 69, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/path/to/django/db/models/query.py", line 84, in __len__
self._result_cache.extend(self._iter)
File "/path/to/django/db/models/query.py", line 273, in iterator
for row in compiler.results_iter():
File "/path/to/django/db/models/sql/compiler.py", line 680, in
results_iter
for rows in self.execute_sql(MULTI):
File "/path/to/django/db/models/sql/compiler.py", line 735, in
execute_sql
cursor.execute(sql, params)
File "/path/to/django/db/backends/mysql/base.py", line 86, in execute
return self.cursor.execute(query, args)
File "/srv/python-environments/academicexperts/lib/python2.7/site-
packages/MySQLdb/cursors.py", line 174, in execute
self.errorhandler(self, exc, value)
File "/srv/python-environments/academicexperts/lib/python2.7/site-
packages/MySQLdb/connections.py", line 36, in defaulterrorhandler
raise errorclass, errorvalue
OperationalError: (1054, "Unknown column
'threadedcomments_comment.object_id' in 'on clause'")
>>>
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/16316>
Django <https://code.djangoproject.com/>
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