#3482: MultipleChoiceField validation against a list with a single null element
-------------------------------------+-------------------------------------
Reporter: Jeff Bauer | Owner: nobody
<jbauer@…> |
Type: Bug | Status: closed
Component: Forms | Version: dev
Severity: Normal | Resolution: wontfix
Keywords: MultipleChoiceField | 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: => wontfix
Comment:
So, it's hard to say about the dark-history here, as bootstrapping a very
old environment is somewhat fiddly these days but
[https://github.com/django/django/blob/d0ea01af2814e276c4a090e599d5fd11c6ce4bf8/django/forms/fields.py#L884-L890
the logic here] is virtually unchanged from the
[https://github.com/django/django/commit/6645d1fe48868814e4c73056b68be5c3861ed2d0
#diff-
19fae1b4e3786d4af8cdf8db08d18d687caeae43859b35c769deb96d3aacf05cR256-R260
earliest days of the MultipleChoiceField implementation]. It's certainly
unchanged as far back as Django 1.8. Without a serious case being made,
the backwards compatibility concerns preclude changing this now.
However, for me, this is expected behaviour: `''` is **not** a valid
choice. If I want filtering of empty values then I'm expecting to use a
widget to filter this in `value_from_datadict`, or else a field subclass,
if I want the behaviour there. The default implementation is doing the
right thing here rejecting the incorrect value.
--
Ticket URL: <https://code.djangoproject.com/ticket/3482#comment:7>
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