#14642: IndexError: list index out of range caused by inline formsets
------------------------------------+--------------------------------------
Reporter: simon@… | Owner: nobody
Status: new | Milestone: 1.3
Component: Forms | Version: 1.2
Resolution: | Keywords: save_as generic inline
Triage Stage: Accepted | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 |
------------------------------------+--------------------------------------
Changes (by poswald):
* cc: poswald (added)
Comment:
I believe I have a fully reproduceable version of this issue. For me it
comes when there is discrepancy between the form submitted and the
database. I was getting this error in my production system and I thought
it was my forms. Turns out I could eliminate my forms as a source of the
issue by using the admin. I've changed the summary to match. I reduced it
down to this test case in Django 1.2.4:
models.py:
{{{
class Thingy(models.Model):
description = models.CharField(max_length=256)
class ThingyItem(models.Model):
thingy = models.ForeignKey(Thingy)
description = models.CharField(max_length=256)
}}}
admin.py:
{{{
class ThingyItemInline(admin.TabularInline):
model = ThingyItem
extra = 0
class ThingyAdmin(admin.ModelAdmin):
inlines = [ThingyItemInline,]
admin.site.register(Thingy, ThingyAdmin)
admin.site.register(ThingyItem)
}}}
Now do the following:
* Create a new Thingy with several ThingyItems in the admin and save it.
* Open the edit page.
* Open the edit page for the same thingy in a second browser window.
* Check the "Delete" button on the last ThingyItem and save it in the
second window.
* Now go back to the first form and save it
When I do this, I get:
{{{
Traceback:
File "/Users/poswald/.virtualenvs/hats/lib/python2.6/site-
packages/django/core/handlers/base.py" in get_response
100. response = callback(request, *callback_args,
**callback_kwargs)
... snipped because it's the same as above ...
File "/Users/poswald/.virtualenvs/hats/lib/python2.6/site-
packages/django/db/models/query.py" in __getitem__
171. return self._result_cache[k]
Exception Type: IndexError at /admin/exampletest/thingy/1/unhandled
Exception Value: list index out of range
}}}
It seems that the inline formset code is a bit brittle. An error is thrown
when the data submitted in the management form is not in agreement with
the state of the database. I'd like to make an automated test case for
this but I'm not sure how to do that sequence of steps in the test client.
If anyone can shed some light onto what the formset code is *supposed* to
do in this situation it would be useful. I imagine the options are the
second form overrides the first or something like a form validation error
is raised that indicates the form is stale.
--
Ticket URL: <http://code.djangoproject.com/ticket/14642#comment:9>
Django <http://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/django-updates?hl=en.
