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Fixed #26142 -- Allowed model formsets to prevent new object creation. 

Thanks Jacob Walls, David Smith, and Mariusz Felisiak for reviews.

Co-authored-by: parth <parthvin@gmail.com>
This commit is contained in:
vgolubev 2021-08-01 23:33:12 +03:00 committed by Mariusz Felisiak
parent 0af9a5fc7d
commit e87f57fdb8
5 changed files with 114 additions and 7 deletions
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11
django/forms/models.py
View File

@ -676,6 +676,9 @@ class BaseModelFormSet(BaseFormSet):
for form in self.saved_forms:
form.save_m2m()
self.save_m2m = save_m2m
if self.edit_only:
return self.save_existing_objects(commit)
else:
return self.save_existing_objects(commit) + self.save_new_objects(commit)
save.alters_data = True
@ -875,7 +878,8 @@ def modelformset_factory(model, form=ModelForm, formfield_callback=None,
widgets=None, validate_max=False, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
min_num=None, validate_min=False, field_classes=None,
absolute_max=None, can_delete_extra=True, renderer=None):
absolute_max=None, can_delete_extra=True, renderer=None,
edit_only=False):
"""Return a FormSet class for the given Django model class."""
meta = getattr(form, 'Meta', None)
if (getattr(meta, 'fields', fields) is None and
@ -896,6 +900,7 @@ def modelformset_factory(model, form=ModelForm, formfield_callback=None,
absolute_max=absolute_max, can_delete_extra=can_delete_extra,
renderer=renderer)
FormSet.model = model
FormSet.edit_only = edit_only
return FormSet
@ -1076,7 +1081,8 @@ def inlineformset_factory(parent_model, model, form=ModelForm,
widgets=None, validate_max=False, localized_fields=None,
labels=None, help_texts=None, error_messages=None,
min_num=None, validate_min=False, field_classes=None,
absolute_max=None, can_delete_extra=True, renderer=None):
absolute_max=None, can_delete_extra=True, renderer=None,
edit_only=False):
"""
Return an ``InlineFormSet`` for the given kwargs.
@ -1109,6 +1115,7 @@ def inlineformset_factory(parent_model, model, form=ModelForm,
'absolute_max': absolute_max,
'can_delete_extra': can_delete_extra,
'renderer': renderer,
'edit_only': edit_only,
}
FormSet = modelformset_factory(model, **kwargs)
FormSet.fk = fk

15
docs/ref/forms/models.txt
View File

@ -52,7 +52,7 @@ Model Form API reference. For introductory material about model forms, see the
``modelformset_factory``
========================
.. function:: modelformset_factory(model, form=ModelForm, formfield_callback=None, formset=BaseModelFormSet, extra=1, can_delete=False, can_order=False, max_num=None, fields=None, exclude=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None, min_num=None, validate_min=False, field_classes=None, absolute_max=None, can_delete_extra=True, renderer=None)
.. function:: modelformset_factory(model, form=ModelForm, formfield_callback=None, formset=BaseModelFormSet, extra=1, can_delete=False, can_order=False, max_num=None, fields=None, exclude=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None, min_num=None, validate_min=False, field_classes=None, absolute_max=None, can_delete_extra=True, renderer=None, edit_only=False)
Returns a ``FormSet`` class for the given ``model`` class.
@ -67,16 +67,23 @@ Model Form API reference. For introductory material about model forms, see the
through to :func:`~django.forms.formsets.formset_factory`. See
:doc:`formsets </topics/forms/formsets>` for details.
The ``edit_only`` argument allows :ref:`preventing new objects creation
<model-formsets-edit-only>`.
See :ref:`model-formsets` for example usage.
.. versionchanged:: 4.0
The ``renderer`` argument was added.
.. versionchanged:: 4.1
The ``edit_only`` argument was added.
``inlineformset_factory``
=========================
.. function:: inlineformset_factory(parent_model, model, form=ModelForm, formset=BaseInlineFormSet, fk_name=None, fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None, min_num=None, validate_min=False, field_classes=None, absolute_max=None, can_delete_extra=True, renderer=None)
.. function:: inlineformset_factory(parent_model, model, form=ModelForm, formset=BaseInlineFormSet, fk_name=None, fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None, widgets=None, validate_max=False, localized_fields=None, labels=None, help_texts=None, error_messages=None, min_num=None, validate_min=False, field_classes=None, absolute_max=None, can_delete_extra=True, renderer=None, edit_only=False)
Returns an ``InlineFormSet`` using :func:`modelformset_factory` with
defaults of ``formset=``:class:`~django.forms.models.BaseInlineFormSet`,
@ -90,3 +97,7 @@ Model Form API reference. For introductory material about model forms, see the
.. versionchanged:: 4.0
The ``renderer`` argument was added.
.. versionchanged:: 4.1
The ``edit_only`` argument was added.

3
docs/releases/4.1.txt
View File

@ -189,6 +189,9 @@ Forms
labels in ``<legend>`` tags via the new ``tag`` argument of
:meth:`~django.forms.BoundField.label_tag`.
* The new ``edit_only`` argument for :func:`.modelformset_factory` and
:func:`.inlineformset_factory` allows preventing new objects creation.
Generic Views
~~~~~~~~~~~~~

23
docs/topics/forms/modelforms.txt
View File

@ -953,8 +953,8 @@ extra forms displayed.
Also, ``extra=0`` doesn't prevent creation of new model instances as you can
:ref:`add additional forms with JavaScript <understanding-the-managementform>`
or send additional POST data. Formsets :ticket:`don't yet provide functionality
<26142>` for an "edit only" view that prevents creation of new instances.
or send additional POST data. See :ref:`model-formsets-edit-only` on how to do
this.
If the value of ``max_num`` is greater than the number of existing related
objects, up to ``extra`` additional blank forms will be added to the formset,
@ -972,6 +972,25 @@ so long as the total number of forms does not exceed ``max_num``::
A ``max_num`` value of ``None`` (the default) puts a high limit on the number
of forms displayed (1000). In practice this is equivalent to no limit.
.. _model-formsets-edit-only:
Preventing new objects creation
-------------------------------
.. versionadded:: 4.1
Using the ``edit_only`` parameter, you can prevent creation of any new
objects::
>>> AuthorFormSet = modelformset_factory(
... Author,
... fields=('name', 'title'),
... edit_only=True,
... )
Here, the formset will only edit existing ``Author`` instances. No other
objects will be created or edited.
Using a model formset in a view
-------------------------------

67
tests/model_formsets/tests.py
View File

@ -1771,6 +1771,73 @@ class ModelFormsetTest(TestCase):
formset = AuthorFormSet({})
self.assertEqual(formset.initial_form_count(), 0)
def test_edit_only(self):
charles = Author.objects.create(name='Charles Baudelaire')
AuthorFormSet = modelformset_factory(Author, fields='__all__', edit_only=True)
data = {
'form-TOTAL_FORMS': '2',
'form-INITIAL_FORMS': '0',
'form-MAX_NUM_FORMS': '0',
'form-0-name': 'Arthur Rimbaud',
'form-1-name': 'Walt Whitman',
}
formset = AuthorFormSet(data)
self.assertIs(formset.is_valid(), True)
formset.save()
self.assertSequenceEqual(Author.objects.all(), [charles])
data = {
'form-TOTAL_FORMS': '2',
'form-INITIAL_FORMS': '1',
'form-MAX_NUM_FORMS': '0',
'form-0-id': charles.pk,
'form-0-name': 'Arthur Rimbaud',
'form-1-name': 'Walt Whitman',
}
formset = AuthorFormSet(data)
self.assertIs(formset.is_valid(), True)
formset.save()
charles.refresh_from_db()
self.assertEqual(charles.name, 'Arthur Rimbaud')
self.assertSequenceEqual(Author.objects.all(), [charles])
def test_edit_only_inlineformset_factory(self):
charles = Author.objects.create(name='Charles Baudelaire')
book = Book.objects.create(author=charles, title='Les Paradis Artificiels')
AuthorFormSet = inlineformset_factory(
Author, Book, can_delete=False, fields='__all__', edit_only=True,
)
data = {
'book_set-TOTAL_FORMS': '4',
'book_set-INITIAL_FORMS': '1',
'book_set-MAX_NUM_FORMS': '0',
'book_set-0-id': book.pk,
'book_set-0-title': 'Les Fleurs du Mal',
'book_set-0-author': charles.pk,
'book_set-1-title': 'Flowers of Evil',
'book_set-1-author': charles.pk,
}
formset = AuthorFormSet(data, instance=charles)
self.assertIs(formset.is_valid(), True)
formset.save()
book.refresh_from_db()
self.assertEqual(book.title, 'Les Fleurs du Mal')
self.assertSequenceEqual(Book.objects.all(), [book])
def test_edit_only_object_outside_of_queryset(self):
charles = Author.objects.create(name='Charles Baudelaire')
walt = Author.objects.create(name='Walt Whitman')
data = {
'form-TOTAL_FORMS': '1',
'form-INITIAL_FORMS': '1',
'form-0-id': walt.pk,
'form-0-name': 'Parth Patil',
}
AuthorFormSet = modelformset_factory(Author, fields='__all__', edit_only=True)
formset = AuthorFormSet(data, queryset=Author.objects.filter(pk=charles.pk))
self.assertIs(formset.is_valid(), True)
formset.save()
self.assertCountEqual(Author.objects.all(), [charles, walt])
class TestModelFormsetOverridesTroughFormMeta(TestCase):
def test_modelformset_factory_widgets(self):