Opened 7 years ago

Closed 7 years ago

Last modified 7 years ago

#27967 closed Bug (fixed)

The autogenerated OneToOneField on multi table inheritance breaks the InlineAdminForm given UUID pk

Reported by: Robin Anupol Owned by: Paulo
Component: contrib.admin Version: 1.10
Severity: Normal Keywords: admin
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no


I'm receiving MultiValueDictKeyError given the following setup:

class A(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    name = models.CharField(max_length=32)

class B(A):
    s = models.ForeignKey('S', models.PROTECT)

class S(models.Model):
    name = models.CharField(max_length=32)

class BInline(admin.StackedInline):
    model = B

class SAdmin(admin.ModelAdmin):
    inlines = [BInline]

To get the error:

  1. On admin page, create an S instance.
  2. On S instance, create 1 B inline instance then save.
  3. Still on S instance, create another B inline instance then save.

Here's the trace:

Traceback (most recent call last):
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/core/handlers/", line 42, in inner
    response = get_response(request)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/core/handlers/", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/core/handlers/", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/", line 544, in wrapper
    return self.admin_site.admin_view(view)(*args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 149, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/views/decorators/", line 57, in _wrapped_view_func
    response = view_func(request, *args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/", line 211, in inner
    return view(request, *args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/", line 1512, in change_view
    return self.changeform_view(request, object_id, form_url, extra_context)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 67, in _wrapper
    return bound_func(*args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 149, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 63, in bound_func
    return func.__get__(self, type(self))(*args2, **kwargs2)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 185, in inner
    return func(*args, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/", line 1448, in changeform_view
    if all_valid(formsets) and form_validated:
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 456, in all_valid
    if not formset.is_valid():
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 321, in is_valid
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 295, in errors
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 343, in full_clean
    form = self.forms[i]
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 35, in __get__
    res = instance.__dict__[] = self.func(instance)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 144, in forms
    for i in range(self.total_form_count())]
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 896, in _construct_form
    form = super(BaseInlineFormSet, self)._construct_form(i, **kwargs)
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/", line 593, in _construct_form
    pk =[pk_key]
  File "/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/", line 85, in __getitem__
    raise MultiValueDictKeyError(repr(key))
MultiValueDictKeyError: "u'b_set-0-a_ptr'"

More info:
The error presents itself under both SQLite and PostgreSQL.
If the id of the parent A is the default AutoField, there's no error.
I specified InlineAdminForm because there's a relevant check there (method: needs_explicit_pk_field) that might be the issue.

Change History (11)

comment:1 by Robin Anupol, 7 years ago

Type: UncategorizedBug

comment:2 by Vedran Karačić, 7 years ago

Cc: vedran@… added
Owner: changed from nobody to Vedran Karačić
Status: newassigned

comment:3 by Tim Graham, 7 years ago

Easy pickings: unset
Triage Stage: UnreviewedAccepted

comment:4 by Vedran Karačić, 7 years ago

Cc: vedran@… removed
Owner: Vedran Karačić removed
Status: assignednew

comment:5 by Robin Anupol, 7 years ago

As a workaround, on the app's, I have this prepended:

from django.contrib.admin.helpers import InlineAdminForm

 def needs_explicit_pk_field(self):
    # original definition goes here
    # place this conditional right before the end of the function
        return True
    return False

InlineAdminForm.needs_explicit_pk_field = needs_explicit_pk_field

from django.contrib import admin
# the rest of goes here. 

This works for me but I'm not sure of any edge cases associated with the auto_created attribute.

comment:6 by Marco Silva, 7 years ago

added a test that reproduces the error, I think....

wip here

comment:7 by oyooyo, 7 years ago

I wonder if this bug is somehow related to #27595
The description reads different, it is said to occur in both PostgreSQL and SQLite - but just like #27595, the issue seems to somehow be related to multi-table inheritance with UUIDFields as primary keys.

comment:8 by Paulo, 7 years ago

Owner: set to Paulo
Status: newassigned

comment:10 by Tim Graham <timograham@…>, 7 years ago

Resolution: fixed
Status: assignedclosed

In 9dc83c35:

Fixed #27967 -- Fixed KeyError in admin's inline form with inherited non-editable pk.

Thanks Robin Anupol for the initial report and workaround.

comment:11 by Tim Graham <timograham@…>, 7 years ago

In 927d9b51:

[1.11.x] Fixed #27967 -- Fixed KeyError in admin's inline form with inherited non-editable pk.

Thanks Robin Anupol for the initial report and workaround.

Backport of 9dc83c356d363c090f3351c908cad6f823aeb7bf from master

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