#29981: "Please correct the error below." (with no errors displayed) when changing an inline that has a one-to-one relation to the parent that uses to_field -------------------------------+------------------------------------ Reporter: Bernie | Owner: nobody Type: Bug | Status: new Component: contrib.admin | Version: 2.1 Severity: Normal | Resolution: Keywords: | Triage Stage: Accepted Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 -------------------------------+------------------------------------ Changes (by Tim Graham):
* stage: Unreviewed => Accepted Old description: > **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.'' New description: **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 EntryDetail(models.Model): entry = models.OneToOneField( Entry, to_field='slug', primary_key=True, on_delete=models.CASCADE ) description = models.TextField(blank=True, null=True) }}} admin.py {{{ from django.contrib import admin from .models import Entry, EntryDetail class EntryDetailInline(admin.StackedInline): model = EntryDetail @admin.register(Entry) class EntryAdmin(admin.ModelAdmin): inlines = [EntryDetailInline] 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 }}} **Steps to reproduce the bug:** In the admin: * add an Entry * fill slug, title, and "Entry detail" description * save and continue editing * change "Entry detail" description * save * Error message in admin: "Please correct the error below." (with no errors listed). `formset[0].errors` is `[{'entry': ['The inline value did not match the parent instance.']}]` which comes from `InlineForeignKeyField` value is `aaa` and `orig` is `1`. **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 }}} -- Comment: I reproduced the issue on master (78fc64578a8715b9812075bbebc829c1251c07fa). I removed `AnotherEntryDetailInline` from the description as it doesn't seem required to reproduce the issue. -- Ticket URL: <https://code.djangoproject.com/ticket/29981#comment:1> Django <https://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 unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/066.70c218da030435ae5cdfabb769c08b91%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.