#27993: Impossible to clear an ArrayField with a forms.MultipleChoiceField
-------------------------------------+-------------------------------------
Reporter: olivierd | Owner: nobody
Type: Bug | Status: new
Component: Forms | Version: 1.10
Severity: Normal | Keywords: ArrayField
Triage Stage: | postgresql MultipleChoiceField
Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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While using a {{{forms.MultipleChoiceField}}} to represent an
{{{ArrayField}}}, there is no way to clear the {{{ArrayField}}}.
Unselecting all items from the rendred {{{<select mutiple="multiple">}}}
correctly leads to an empty list showing up in the form's
{{{cleaned_data}}} but the value is ignored. The problem is that
{{{django.forms.models.construct_instance}}} ignores the value due to
{{{django.forms.widgets.SelectMultiple}}} (correctly) returning {{{True}}}
from {{{value_omitted_from_data(...)}}}.
The following small code example will demonstrate the issue by failing on
the last assert.
{{{
from django.db import models
from django import forms
from django.contrib.postgres.fields import ArrayField
class TestModel(models.Model):
array = ArrayField(models.CharField(max_length=10), default=list,
blank=True)
class Meta:
app_label = 'test'
class TestForm(forms.ModelForm):
array = forms.MultipleChoiceField(choices=(('one', 'One'), ('two',
'Two')), required=False)
class Meta:
model = TestModel
fields = '__all__'
test_instance = TestModel(array=['one'])
assert test_instance.array == ['one']
test_form = TestForm(instance=test_instance)
test_form = TestForm(data=[], instance=test_instance)
assert test_form.is_valid()
assert test_form.cleaned_data == {'array': []}
updated_instance = test_form.save(commit=False)
assert updated_instance.array == []
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/27993>
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