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307 lines
12 KiB
Python
307 lines
12 KiB
Python
import datetime
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from django import forms
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from django.core.validators import ValidationError
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from django.forms.models import ModelChoiceIterator
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from django.forms.widgets import CheckboxSelectMultiple
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from django.template import Context, Template
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from django.test import TestCase
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from .models import Article, Author, Book, Category, Writer
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class ModelChoiceFieldTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.c1 = Category.objects.create(name='Entertainment', slug='entertainment', url='entertainment')
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cls.c2 = Category.objects.create(name='A test', slug='test', url='test')
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cls.c3 = Category.objects.create(name='Third', slug='third-test', url='third')
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def test_basics(self):
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f = forms.ModelChoiceField(Category.objects.all())
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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(self.c3.pk, 'Third'),
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])
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with self.assertRaises(ValidationError):
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f.clean('')
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with self.assertRaises(ValidationError):
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f.clean(None)
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with self.assertRaises(ValidationError):
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f.clean(0)
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# Invalid types that require TypeError to be caught.
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with self.assertRaises(ValidationError):
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f.clean([['fail']])
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with self.assertRaises(ValidationError):
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f.clean([{'foo': 'bar'}])
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self.assertEqual(f.clean(self.c2.id).name, 'A test')
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self.assertEqual(f.clean(self.c3.id).name, 'Third')
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# Add a Category object *after* the ModelChoiceField has already been
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# instantiated. This proves clean() checks the database during clean()
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# rather than caching it at instantiation time.
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c4 = Category.objects.create(name='Fourth', url='4th')
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self.assertEqual(f.clean(c4.id).name, 'Fourth')
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# Delete a Category object *after* the ModelChoiceField has already been
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# instantiated. This proves clean() checks the database during clean()
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# rather than caching it at instantiation time.
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Category.objects.get(url='4th').delete()
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msg = "['Select a valid choice. That choice is not one of the available choices.']"
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with self.assertRaisesMessage(ValidationError, msg):
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f.clean(c4.id)
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def test_choices(self):
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f = forms.ModelChoiceField(Category.objects.filter(pk=self.c1.id), required=False)
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self.assertIsNone(f.clean(''))
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self.assertEqual(f.clean(str(self.c1.id)).name, 'Entertainment')
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with self.assertRaises(ValidationError):
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f.clean('100')
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# len() can be called on choices.
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self.assertEqual(len(f.choices), 2)
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# queryset can be changed after the field is created.
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f.queryset = Category.objects.exclude(name='Third')
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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])
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self.assertEqual(f.clean(self.c2.id).name, 'A test')
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with self.assertRaises(ValidationError):
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f.clean(self.c3.id)
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# Choices can be iterated repeatedly.
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gen_one = list(f.choices)
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gen_two = f.choices
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self.assertEqual(gen_one[2], (self.c2.pk, 'A test'))
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self.assertEqual(list(gen_two), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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])
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# Overriding label_from_instance() to print custom labels.
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f.queryset = Category.objects.all()
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f.label_from_instance = lambda obj: 'category ' + str(obj)
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'category Entertainment'),
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(self.c2.pk, 'category A test'),
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(self.c3.pk, 'category Third'),
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])
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def test_choices_freshness(self):
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f = forms.ModelChoiceField(Category.objects.all())
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self.assertEqual(len(f.choices), 4)
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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(self.c3.pk, 'Third'),
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])
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c4 = Category.objects.create(name='Fourth', slug='4th', url='4th')
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self.assertEqual(len(f.choices), 5)
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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(self.c3.pk, 'Third'),
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(c4.pk, 'Fourth'),
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])
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def test_choices_bool(self):
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f = forms.ModelChoiceField(Category.objects.all(), empty_label=None)
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self.assertIs(bool(f.choices), True)
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Category.objects.all().delete()
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self.assertIs(bool(f.choices), False)
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def test_choices_bool_empty_label(self):
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f = forms.ModelChoiceField(Category.objects.all(), empty_label='--------')
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Category.objects.all().delete()
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self.assertIs(bool(f.choices), True)
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def test_deepcopies_widget(self):
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class ModelChoiceForm(forms.Form):
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category = forms.ModelChoiceField(Category.objects.all())
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form1 = ModelChoiceForm()
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field1 = form1.fields['category']
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# To allow the widget to change the queryset of field1.widget.choices
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# without affecting other forms, the following must hold (#11183):
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self.assertIsNot(field1, ModelChoiceForm.base_fields['category'])
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self.assertIs(field1.widget.choices.field, field1)
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def test_result_cache_not_shared(self):
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class ModelChoiceForm(forms.Form):
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category = forms.ModelChoiceField(Category.objects.all())
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form1 = ModelChoiceForm()
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self.assertCountEqual(form1.fields['category'].queryset, [self.c1, self.c2, self.c3])
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form2 = ModelChoiceForm()
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self.assertIsNone(form2.fields['category'].queryset._result_cache)
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def test_queryset_none(self):
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class ModelChoiceForm(forms.Form):
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category = forms.ModelChoiceField(queryset=None)
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.fields['category'].queryset = Category.objects.filter(slug__contains='test')
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form = ModelChoiceForm()
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self.assertCountEqual(form.fields['category'].queryset, [self.c2, self.c3])
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def test_no_extra_query_when_accessing_attrs(self):
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"""
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ModelChoiceField with RadioSelect widget doesn't produce unnecessary
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db queries when accessing its BoundField's attrs.
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"""
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class ModelChoiceForm(forms.Form):
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category = forms.ModelChoiceField(Category.objects.all(), widget=forms.RadioSelect)
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form = ModelChoiceForm()
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field = form['category'] # BoundField
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template = Template('{{ field.name }}{{ field }}{{ field.help_text }}')
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with self.assertNumQueries(1):
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template.render(Context({'field': field}))
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def test_disabled_modelchoicefield(self):
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class ModelChoiceForm(forms.ModelForm):
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author = forms.ModelChoiceField(Author.objects.all(), disabled=True)
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class Meta:
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model = Book
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fields = ['author']
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book = Book.objects.create(author=Writer.objects.create(name='Test writer'))
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form = ModelChoiceForm({}, instance=book)
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self.assertEqual(
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form.errors['author'],
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['Select a valid choice. That choice is not one of the available choices.']
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)
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def test_disabled_modelchoicefield_has_changed(self):
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field = forms.ModelChoiceField(Author.objects.all(), disabled=True)
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self.assertIs(field.has_changed('x', 'y'), False)
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def test_disabled_multiplemodelchoicefield(self):
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class ArticleForm(forms.ModelForm):
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categories = forms.ModelMultipleChoiceField(Category.objects.all(), required=False)
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class Meta:
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model = Article
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fields = ['categories']
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category1 = Category.objects.create(name='cat1')
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category2 = Category.objects.create(name='cat2')
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article = Article.objects.create(
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pub_date=datetime.date(1988, 1, 4),
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writer=Writer.objects.create(name='Test writer'),
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)
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article.categories.set([category1.pk])
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form = ArticleForm(data={'categories': [category2.pk]}, instance=article)
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self.assertEqual(form.errors, {})
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self.assertEqual([x.pk for x in form.cleaned_data['categories']], [category2.pk])
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# Disabled fields use the value from `instance` rather than `data`.
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form = ArticleForm(data={'categories': [category2.pk]}, instance=article)
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form.fields['categories'].disabled = True
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self.assertEqual(form.errors, {})
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self.assertEqual([x.pk for x in form.cleaned_data['categories']], [category1.pk])
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def test_disabled_modelmultiplechoicefield_has_changed(self):
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field = forms.ModelMultipleChoiceField(Author.objects.all(), disabled=True)
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self.assertIs(field.has_changed('x', 'y'), False)
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def test_overridable_choice_iterator(self):
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"""
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Iterator defaults to ModelChoiceIterator and can be overridden with
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the iterator attribute on a ModelChoiceField subclass.
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"""
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field = forms.ModelChoiceField(Category.objects.all())
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self.assertIsInstance(field.choices, ModelChoiceIterator)
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class CustomModelChoiceIterator(ModelChoiceIterator):
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pass
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class CustomModelChoiceField(forms.ModelChoiceField):
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iterator = CustomModelChoiceIterator
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field = CustomModelChoiceField(Category.objects.all())
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self.assertIsInstance(field.choices, CustomModelChoiceIterator)
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def test_choice_iterator_passes_model_to_widget(self):
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class CustomModelChoiceValue:
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def __init__(self, value, obj):
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self.value = value
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self.obj = obj
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def __str__(self):
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return str(self.value)
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class CustomModelChoiceIterator(ModelChoiceIterator):
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def choice(self, obj):
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value, label = super().choice(obj)
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return CustomModelChoiceValue(value, obj), label
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class CustomCheckboxSelectMultiple(CheckboxSelectMultiple):
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def create_option(self, name, value, label, selected, index, subindex=None, attrs=None):
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option = super().create_option(name, value, label, selected, index, subindex=None, attrs=None)
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# Modify the HTML based on the object being rendered.
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c = value.obj
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option['attrs']['data-slug'] = c.slug
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return option
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class CustomModelMultipleChoiceField(forms.ModelMultipleChoiceField):
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iterator = CustomModelChoiceIterator
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widget = CustomCheckboxSelectMultiple
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field = CustomModelMultipleChoiceField(Category.objects.all())
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self.assertHTMLEqual(
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field.widget.render('name', []),
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'''<ul>
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<li><label><input type="checkbox" name="name" value="%d" data-slug="entertainment">Entertainment</label></li>
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<li><label><input type="checkbox" name="name" value="%d" data-slug="test">A test</label></li>
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<li><label><input type="checkbox" name="name" value="%d" data-slug="third-test">Third</label></li>
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</ul>''' % (self.c1.pk, self.c2.pk, self.c3.pk),
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)
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def test_choices_not_fetched_when_not_rendering(self):
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with self.assertNumQueries(1):
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field = forms.ModelChoiceField(Category.objects.order_by('-name'))
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self.assertEqual('Entertainment', field.clean(self.c1.pk).name)
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def test_queryset_manager(self):
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f = forms.ModelChoiceField(Category.objects)
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self.assertEqual(len(f.choices), 4)
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self.assertEqual(list(f.choices), [
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('', '---------'),
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(self.c1.pk, 'Entertainment'),
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(self.c2.pk, 'A test'),
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(self.c3.pk, 'Third'),
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])
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def test_num_queries(self):
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"""
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Widgets that render multiple subwidgets shouldn't make more than one
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database query.
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"""
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categories = Category.objects.all()
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class CategoriesForm(forms.Form):
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radio = forms.ModelChoiceField(queryset=categories, widget=forms.RadioSelect)
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checkbox = forms.ModelMultipleChoiceField(queryset=categories, widget=forms.CheckboxSelectMultiple)
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template = Template(
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'{% for widget in form.checkbox %}{{ widget }}{% endfor %}'
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'{% for widget in form.radio %}{{ widget }}{% endfor %}'
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)
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with self.assertNumQueries(2):
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template.render(Context({'form': CategoriesForm()}))
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