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Fixed #4653 -- Improved the logic to decide when to include (and select as

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initial value) the blank choice for a model field with choices. Thanks to
Ilya Semenov for persisting with this.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@6733 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick
2007-11-29 16:32:18 +00:00
parent a4ea8d4e93
commit d0f5a58fbd
4 changed files with 88 additions and 6 deletions
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18
docs/newforms.txt
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@@ -1849,7 +1849,11 @@ In addition, each generated form field has attributes set as follows:
* If the model field has ``choices`` set, then the form field's ``widget``
will be set to ``Select``, with choices coming from the model field's
``choices``.
``choices``. The choices will normally include the blank choice which is
selected by default. If the field is required, this forces the user to
make a selection. The blank choice will not be included if the model
field has ``blank=False`` and an explicit ``default`` value (the
``default`` value will be initially selected instead).
Finally, note that you can override the form field used for a given model
field. See "Overriding the default field types" below.
@@ -2095,10 +2099,14 @@ instance instead of a model class::
# Instantiate the form.
>>> f = AuthorForm()
When a form created by ``form_for_instance()`` is created, the initial
data values for the form fields are drawn from the instance. However,
this data is not bound to the form. You will need to bind data to the
form before the form can be saved.
When a form created by ``form_for_instance()`` is created, the initial data
values for the form fields are drawn from the instance. However, this data is
not bound to the form. You will need to bind data to the form before the form
can be saved.
Unlike ``form_for_model()``, a choice field in form created by
``form_for_instance()`` will not include the blank choice if the respective
model field has ``blank=False``. The initial choice is drawn from the instance.
When you call ``save()`` on a form created by ``form_for_instance()``,
the database instance will be updated. As in ``form_for_model()``, ``save()``