id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27967	The autogenerated OneToOneField on multi table inheritance breaks the InlineAdminForm given UUID pk	Robin Anupol	Paulo	"I'm receiving MultiValueDictKeyError given the following setup:
{{{
# models.py
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)

# admin.py
class BInline(admin.StackedInline):
    model = B

@admin.register(S)
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/exception.py"", line 42, in inner
    response = get_response(request)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/core/handlers/base.py"", 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/base.py"", 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/options.py"", 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/decorators.py"", 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/cache.py"", 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/sites.py"", line 211, in inner
    return view(request, *args, **kwargs)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/options.py"", 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/decorators.py"", line 67, in _wrapper
    return bound_func(*args, **kwargs)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/decorators.py"", line 149, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/decorators.py"", 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/decorators.py"", line 185, in inner
    return func(*args, **kwargs)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/contrib/admin/options.py"", 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/formsets.py"", line 456, in all_valid
    if not formset.is_valid():
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/formsets.py"", line 321, in is_valid
    self.errors
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/formsets.py"", line 295, in errors
    self.full_clean()
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/formsets.py"", line 343, in full_clean
    form = self.forms[i]
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/functional.py"", line 35, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/forms/formsets.py"", 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/models.py"", 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/models.py"", line 593, in _construct_form
    pk = self.data[pk_key]
  File ""/home/rnddev/.virtualenvs/vulcan/local/lib/python2.7/site-packages/django/utils/datastructures.py"", 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."	Bug	closed	contrib.admin	1.10	Normal	fixed	admin		Accepted	1	0	0	0	0	0