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Fixed 11674 -- Clarified docs on excluded fields of ModelForms.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@16875 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Paul McMillan 2011-09-22 04:52:43 +00:00
parent 4f9cf2ef27
commit 4f109fcbff
1 changed files with 17 additions and 7 deletions
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24
docs/topics/forms/modelforms.txt
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@ -331,13 +331,17 @@ Since the Author model has only 3 fields, 'name', 'title', and
.. note::
If you specify ``fields`` or ``exclude`` when creating a form with
``ModelForm``, then the fields that are not in the resulting form will not
be set by the form's ``save()`` method. Django will prevent any attempt to
save an incomplete model, so if the model does not allow the missing fields
to be empty, and does not provide a default value for the missing fields,
any attempt to ``save()`` a ``ModelForm`` with missing fields will fail.
To avoid this failure, you must instantiate your model with initial values
for the missing, but required fields::
``ModelForm``, then the fields that are not in the resulting form
will not be set by the form's ``save()`` method. Also, if you
manually add the excluded fields back to the form, they will not
be initialized from the model instance.
Django will prevent any attempt to save an incomplete model, so if
the model does not allow the missing fields to be empty, and does
not provide a default value for the missing fields, any attempt to
``save()`` a ``ModelForm`` with missing fields will fail. To
avoid this failure, you must instantiate your model with initial
values for the missing, but required fields::
author = Author(title='Mr')
form = PartialAuthorForm(request.POST, instance=author)
@ -632,6 +636,12 @@ database. If a given instance's data didn't change in the bound data, the
instance won't be saved to the database and won't be included in the return
value (``instances``, in the above example).
When fields are missing from the form (for example because they have
been excluded), these fields will not be set by the ``save()``
method. You can find more information about this restriction, which
also holds for regular ``ModelForms``, in `Using a subset of fields on
the form`_.
Pass ``commit=False`` to return the unsaved model instances::
# don't save to the database