#29981: invalid_choice error when changing InlineModel with a OneToOne relation
via
to_field
-----------------------------------------+------------------------
Reporter: Bernie | Owner: nobody
Type: Bug | Status: new
Component: contrib.admin | Version: 2.1
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-----------------------------------------+------------------------
**Code sample:**
models.py:
{{{
from django.db import models
class Entry(models.Model):
slug = models.SlugField(max_length=80, unique=True)
title = models.CharField(max_length=255, blank=True, null=True)
class Meta:
verbose_name_plural = 'Entries'
class EntryDetail(models.Model):
entry = models.OneToOneField(
Entry,
to_field='slug',
primary_key=True,
on_delete=models.CASCADE
)
description = models.TextField(blank=True, null=True)
class AnotherEntryDetail(models.Model):
entry = models.OneToOneField(
Entry,
primary_key=True,
on_delete=models.CASCADE
)
otherdescription = models.TextField(blank=True, null=True)
}}}
admin.py
{{{
from django.contrib import admin
from .models import Entry, EntryDetail, AnotherEntryDetail
class EntryDetailInline(admin.StackedInline):
model = EntryDetail
class AnotherEntryDetailInline(admin.StackedInline):
model = AnotherEntryDetail
@admin.register(Entry)
class EntryAdmin(admin.ModelAdmin):
inlines = [
EntryDetailInline,
AnotherEntryDetailInline
]
def get_readonly_fields(self, request, obj=None):
# Even with EntryDetail.entry_id ON UPDATE: CASCADE set on DB-
level
# changing Entry.slug through the admin-change-form with
EntryDetail-inline fails.
# Set slug readonly as workaround. Don't know if this is worth
fixing.
readonly_fields = super().get_readonly_fields(request, obj)
if hasattr(obj, 'entrydetail') and 'slug' not in readonly_fields:
readonly_fields += ('slug',)
return readonly_fields
}}}
**Expected behavior:**
In the admin:
* add an Entry
* fill slug and "Another entry detail" description
* save
* (change "Another entry detail" description)
* **save**
**Steps to reproduce the bug:**
In the admin:
* add an Entry
* fill slug and "Entry detail" description
* save
* (change "Entry detail" description)
* **save**
* Error message in admin: "Please correct the error below."
**Workaround:**
in models.py replace
{{{
class EntryDetailInline(admin.StackedInline):
model = EntryDetail
}}}
with:
{{{
from django.forms import BaseInlineFormSet
class EntryDetailFormSet(BaseInlineFormSet):
def add_fields(self, form, index):
super().add_fields(form, index)
related_name = self._pk_field.remote_field.related_name or
self._pk_field.remote_field.name
if hasattr(self.instance, related_name):
form.fields[self._pk_field.name].to_field =
self._pk_field.remote_field.field_name
class EntryDetailInline(admin.StackedInline):
model = EntryDetail
formset = EntryDetailFormSet
}}}
''Sorry for the confusing ticket-title, i couldn't come up with something
better.''
--
Ticket URL: <https://code.djangoproject.com/ticket/29981>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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