#25559: Conditional admin inline causes ValidationError
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Reporter: zborboa-google | Owner: nobody
Type: Uncategorized | Status: new
Component: Uncategorized | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Attempting to save an object in the Django admin using a conditional to
show/hide an admin inline causes `ValidationError: ManagementForm data is
missing or has been tampered with`.
1. Add a new student. Specify a name ("Alice") and click the Save and
continue editing button.
2. Now click the + to add a Team. Specify a team name ("Team A") and click
the Save button.
3. Back on the student page with the team now selected, click the Save and
continue editing button.
Result: ValidationError
Expected: Student object to be saved and the inline to now be displayed.
{{{#!python
# myapp/models.py
from django.db import models
class Team(models.Model):
name = models.CharField(max_length=255)
def __unicode__(self):
return self.name
class Category(models.Model):
name = models.CharField(max_length=255)
class Student(models.Model):
name = models.CharField(max_length=255)
team = models.ForeignKey(Team, blank=True, null=True)
categories = models.ManyToManyField(Category, through='CategoryInfo')
class CategoryInfo(models.Model):
category = models.ForeignKey(Category)
student = models.ForeignKey(Student)
score = models.CharField(max_length=255)
}}}
{{{#!python
# myapp/admin.py
from django.contrib import admin
from models import Student
from models import Team
class CategoryInlineAdmin(admin.TabularInline):
model = Student.categories.through
class StudentAdmin(admin.ModelAdmin):
inlines = []
def get_inline_instances(self, request, obj=None):
inlines = self.inlines
# Display inline when the object has been saved and a team has
been selected.
if obj and obj.team:
inlines = [CategoryInlineAdmin,]
return [inline(self.model, self.admin_site) for inline in inlines]
class TeamAdmin(admin.ModelAdmin):
pass
admin.site.register(Student, StudentAdmin)
admin.site.register(Team, TeamAdmin)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/25559>
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