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 21955 "Formset save_as_new=True causes ""This QueryDict instance is immutable"" error" Robin nobody "Basically if you post a properly setup inline formset with '''save_as_new=True''' argument: {{{ FormSet = inlineformset_factory(Model, SubModel) formset = FormSet(request.POST, save_as_new=True) }}} You will get {{{ AttributeError at / This QueryDict instance is immutable }}} '''Some demo code below:''' views.py {{{#!python from django.forms.models import inlineformset_factory from django.middleware.csrf import get_token from django.http import HttpResponse from django.template.base import Template, Context from app.models import App, SubApp def home(request): FormSet = inlineformset_factory(App, SubApp) if request.method == 'POST': formset = FormSet(request.POST, save_as_new=True) else: formset = FormSet() csrf = get_token(request) t = '''
''' c = { 'formset': formset, 'csrf': csrf, } s = Template(t).render(Context(c)) return HttpResponse(s) }}} models.py {{{#!python from django.db import models class App(models.Model): pass class SubApp(models.Model): app = models.ForeignKey(App) }}}" Bug closed Forms 1.6 Normal invalid Unreviewed 0 0 0 0 0 0