#25987: Creating new object on adminsite with child model inlines and
unique_together raises IntegrityError
----------------------------+--------------------
Reporter: MrYoda | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version:
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I'm getting an IntegrityError when trying to create a model (ParentModel)
with inlines for ChildModel which have unique_together constraint on
(ParentModel, some_field).
When ParentModel object already exists and I try to add duplicates for
ChildModel, BaseModelFormSet.validate_unique() nicely prevents me to save
data and prints the standard django adminsite error "Please correct the
duplicate values below" with concrete message for duplicate inline rows
"'Please correct the duplicate data for some_field".
models.py:
{{{#!python
from django.db import models
class ParentModel(models.Model):
title = models.CharField(max_length=100, verbose_name='Title')
class ChildModel(models.Model):
parent = models.ForeignKey(ParentModel, verbose_name='Link to parent')
some_field = models.IntegerField(verbose_name='Some numeric field for
unique_together')
class Meta:
unique_together = (('parent', 'some_field'), )
}}}
admin.py:
{{{#!python
from django.contrib import admin
from .models import *
class ChildModelFormInline(admin.TabularInline):
model = ChildModel
class ParentModelAdmin(admin.ModelAdmin):
inlines = (ChildModelFormInline, )
class ChildModelAdmin(admin.ModelAdmin):
pass
admin.site.register(ParentModel, ParentModelAdmin)
admin.site.register(ChildModel, ChildModelAdmin)
}}}
I think it's important issue. If our "ParentModel" has many "ChildModels"
with many fields and inlines, people don't want lose their data on http
500 due to IntegriryError. Googling gives me workarounds only.
Done this on Django 1.7.11, 1.8.7 and 1.9 with SQLite (3.8.2 2013-12-06)
and PostgreSQL (9.4.3)
--
Ticket URL: <https://code.djangoproject.com/ticket/25987>
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