[Django] #29411: Pickling of a form fails after a form was used in a template
Django
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Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 2.0
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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The following view function fails from its second invocation on:
{{{
def main(request):
import django.forms as forms
import pickle
pickle.dump(forms.Form(), open("/dev/null", "wb")) # This fails, but
not at the very first invocation.
return render(request, "main.html", {"example_form": ExampleForm()})
}}}
Steps to reproduce:
1. `django-admin startproject pickle_problem`
2. `cd pickle_problem`
3. Apply the attached patch with `-p1`.
4. Apply migrations, start testserver.
5. Open the URL “/” on the testserver. You should see a bogus form with
one boolean field.
6. Reload the page.
What happens:
The pickling of `form.Form()` fails. See the attached traceback.
I observe this problem since Django 1.11. Up to Django 1.10, it has
worked fine for me.
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Ticket URL: <https://code.djangoproject.com/ticket/29411>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
Django
Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 2.0
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by Torsten Bronger):
* Attachment "minimal_example.diff" added.
Patch to create a minimal example.
Django
Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 2.0
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by Torsten Bronger):
* Attachment "testserver_output.log" added.
Output of Django's testserver, including the traceback.
Django
Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 2.0
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by Torsten Bronger):
* Attachment "minimal_example.diff" added.
Patch to create a minimal example.
--
Django
Reporter: Torsten Bronger | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 2.0
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Comment (by Torsten Bronger):
With the following view function, the error can be reproduced without
reloading the page, which may be easier for automatic reproducing:
{{{
def main(request):
pickle.dump(forms.Form(), open("/dev/null", "wb"))
result = render(request, "main.html", {"example_form": ExampleForm()})
pickle.dump(forms.Form(), open("/dev/null", "wb"))
return result
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/29411#comment:1>
Django
Reporter: Torsten Bronger | Owner: nobody
Component: Forms | Version: 2.0
Severity: Normal | Resolution: duplicate
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
Changes (by Carlton Gibson):
* status: new => closed
* resolution: => duplicate
Comment:
This looks like a duplicate of #28223. (The traceback error is the same as
reported there.)
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Ticket URL: <https://code.djangoproject.com/ticket/29411#comment:2>