#7853: django admin problem used model inheritance
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Reporter: [EMAIL PROTECTED] | Owner: nobody
Status: reopened | Milestone:
Component: Database wrapper | Version: SVN
Resolution: | Keywords: model inheritance
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by Sanha):
* keywords: model inheritance, django admin => model inheritance
* resolution: duplicate =>
* status: closed => reopened
* component: django-admin.py => Database wrapper
Comment:
I think that second issue is valid.
when parent model has foreign key to self, delete child (or parent) object
was failed because finding parent's foreign key.
see below.
{{{
class Parent(models.Model):
s = models.ForeignKey('self', null=True, blank=True)
# or same: s = models.ForeignKey('Parent', null=True, blank=True)
a = models.TextField()
class Child(Parent):
b = models.TextField()
}}}
python shell
{{{
>>> child = Child.objects.create(a='parent field', b='child field')
>>> child.delete()
Traceback (most recent call last):
File "<console>", line 1, in <module>
File "/usr/lib64/python2.5/site-packages/django/db/models/base.py", line
423, in delete
delete_objects(seen_objs)
File "/usr/lib64/python2.5/site-packages/django/db/models/query.py",
line 836, in delete_objects
update_query.clear_related(field, pk_list)
File "/usr/lib64/python2.5/site-
packages/django/db/models/sql/subqueries.py", line 211, in clear_related
self.execute_sql(None)
File "/usr/lib64/python2.5/site-
packages/django/db/models/sql/subqueries.py", line 112, in execute_sql
super(UpdateQuery, self).execute_sql(result_type)
File "/usr/lib64/python2.5/site-packages/django/db/models/sql/query.py",
line 1608, in execute_sql
cursor.execute(sql, params)
File "/usr/lib64/python2.5/site-packages/django/db/backends/util.py",
line 18, in execute
return self.cursor.execute(sql, params)
ProgrammingError: "s_id" column is not exist at "forums_child" relation.
}}}
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Ticket URL: <http://code.djangoproject.com/ticket/7853#comment:3>
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