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Code Issues 32 Releases Wiki Activity

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

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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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23
docs/topics/forms/modelforms.txt
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@@ -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
-------------------------------