#32432: ModelForm does not respect ModelChoiceField's to_field_name attribute
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Reporter: gopackgo90 | Owner: nobody
Type: Uncategorized | Status: new
Component: Forms | Version: 3.1
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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This is the same issue mentioned in #17657 but for ModelChoiceField
instead of ModelMultipleChoiceField. This bug is present in Django 2.2.18
and Django 3.1.6. The first two tests were taken directly from #17657 just
to show that ModelMultipleChoiceField still works as expected and the
equivalent ModelChoiceField tests are added after, the last of which
fails:
{{{
# models.py
from django.db import models
class Foo(models.Model):
slug = models.CharField(max_length=40, unique=True)
title = models.CharField(max_length=40, unique=True)
def __str__(self):
return self.title
class Bar(models.Model):
foos = models.ManyToManyField(Foo)
class Baz(models.Model):
foo = models.ForeignKey(Foo, on_delete=models.CASCADE)
}}}
{{{
# tests.py
from django.test.testcases import TestCase
from django import forms
from .models import Foo, Bar, Baz
class TestModelRelationshipChoiceWithFieldName(TestCase):
@classmethod
def setUpTestData(cls):
spam = Foo.objects.create(title="Spam", slug="spam")
ham = Foo.objects.create(title="Ham", slug="ham")
eggs = Foo.objects.create(title="Eggs", slug="eggs")
cls.m2m_instance = Bar.objects.create()
cls.m2m_instance.foos.add(spam)
cls.m2m_instance.foos.add(ham)
cls.m2m_instance.foos.add(eggs)
cls.fk_instance = Baz.objects.create(foo=eggs)
def test_multiple_without_field_name(self):
class Form(forms.ModelForm):
foos = forms.ModelMultipleChoiceField(Foo.objects.all())
class Meta:
model = Bar
fields = '__all__'
form = Form(instance=self.m2m_instance)
self.assertEquals(
str(form["foos"]),
'<select name="foos" required id="id_foos" multiple>\n'
' <option value="1" selected>Spam</option>\n\n'
' <option value="2" selected>Ham</option>\n\n'
' <option value="3" selected>Eggs</option>\n\n'
'</select>'
)
def test_multiple_with_field_name(self):
class Form(forms.ModelForm):
foos = forms.ModelMultipleChoiceField(Foo.objects.all(),
to_field_name="slug")
class Meta:
model = Bar
fields = '__all__'
form = Form(instance=self.m2m_instance)
# Fixed in #17657, options weren't selected.
self.assertEquals(
str(form["foos"]),
'<select name="foos" required id="id_foos" multiple>\n'
' <option value="spam" selected>Spam</option>\n\n'
' <option value="ham" selected>Ham</option>\n\n'
' <option value="eggs" selected>Eggs</option>\n\n'
'</select>'
)
def test_one_without_field_name(self):
class Form(forms.ModelForm):
foo = forms.ModelChoiceField(Foo.objects.all())
class Meta:
model = Baz
fields = '__all__'
form = Form(instance=self.fk_instance)
self.assertEquals(
str(form["foo"]),
'<select name="foo" required id="id_foo">\n'
' <option value="">---------</option>\n\n'
' <option value="1">Spam</option>\n\n'
' <option value="2">Ham</option>\n\n'
' <option value="3" selected>Eggs</option>\n\n'
'</select>'
)
def test_one_with_field_name(self):
class Form(forms.ModelForm):
foo = forms.ModelChoiceField(Foo.objects.all(),
to_field_name="slug")
class Meta:
model = Baz
fields = '__all__'
form = Form(instance=self.fk_instance)
# Fails! Option isn't selected.
self.assertEquals(
str(form["foo"]),
'<select name="foo" required id="id_foo">\n'
' <option value="">---------</option>\n\n'
' <option value="spam">Spam</option>\n\n'
' <option value="ham">Ham</option>\n\n'
' <option value="eggs" selected>Eggs</option>\n\n'
'</select>'
)
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/32432>
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