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#29273 closed Bug (fixed)

MultipleChoiceField incorrectly selects the empty value for an empty form

Reported by:	Tim Kleinschmidt	Owned by:	nobody
Component:	Forms	Version:	1.11
Severity:	Release blocker	Keywords:
Cc:		Triage Stage:	Accepted
Has patch:	yes	Needs documentation:	no
Needs tests:	no	Patch needs improvement:	no
Easy pickings:	no	UI/UX:	no

Description

hi,

I upgraded Django from 1.8 to 1.11, in the last month and we have now a bug that the empty choice is always selected on initial page load and leads to confusion. If I deselect and select the value it work like intended.

It seems for me that there is no check if something was already selected or if it be a fresh form. Like it was in 1.8 in selected_choices

I think this report also apply to the ModelMultipleChoiceField

e.g.

Code highlighting:

choices = [(u'', '(no extra)'), (u'cheese', u'Cheese'), (u'Pepper', u'Pepper')]
extra_topics = forms.MultipleChoiceField(required=False, choices=choices)

Change History (8)

comment:1 by Tim Kleinschmidt, 7 years ago

Type:	Uncategorized → Bug

comment:2 by Tim Graham, 7 years ago

Can you please be more explicit about the steps to reproduce the issue?

comment:3 by Tim Graham, 7 years ago

Severity:	Normal → Release blocker
Summary:	MultipleChoiceField auto selects on initial load the empty value → MultipleChoiceField incorrectly selects the empty value for an empty form
Triage Stage:	Unreviewed → Accepted

The difference can be seen here:

from django import forms
choices = [('', '(no extra)'), ('cheese', 'Cheese'), ('Pepper', 'Pepper')]
class Form(forms.Form):
    extra_topics = forms.MultipleChoiceField(required=False, choices=choices)
    
form = Form()
print(form)

The first option renders as <option value="" selected>(no extra)</option> in Django 1.11+ but without selected in older versions.