Opened 13 years ago
Closed 13 years ago
#16316 closed Bug (duplicate)
Error with GenericRelation applied to a subclass
Reported by: | Owned by: | nobody | |
---|---|---|---|
Component: | Database layer (models, ORM) | Version: | 1.3 |
Severity: | Normal | Keywords: | |
Cc: | Triage Stage: | Unreviewed | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
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'") >>>
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Duplicate of #9899 (GenericRelation of a childmodel can't be used in lookup) and #12885 (GenericRelation fails to join the related table from a inherited model)