#21955: Formset save_as_new=True causes "This QueryDict instance is immutable"
error
----------------------------+--------------------
Reporter: robin | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 1.6
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------
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 = '''
<form method="POST">
{{ formset }}
<input type="hidden" name="csrfmiddlewaretoken" value="{{ csrf
}}" />
<input type="submit" />
</form>
'''
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)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/21955>
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