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[1.8.x] Fixed #24191 -- Documented Form.changed_data 

Thanks rhertzog and Björn Påhlsson for the suggestion.

Backport of 5c98223f39 from master
This commit is contained in:
Alasdair Nicol 2015-06-04 16:19:57 +01:00 committed by Tim Graham
parent 2358c1e5d7
commit cccb7b49dc
1 changed files with 12 additions and 2 deletions
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14
docs/ref/forms/api.txt
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@ -256,8 +256,8 @@ precedence::
<tr><th>Url:</th><td><input type="url" name="url" /></td></tr>
<tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
Checking if form data has changed
---------------------------------
Checking which form data has changed
------------------------------------
.. method:: Form.has_changed()
@ -283,6 +283,16 @@ from what was provided in :attr:`~Form.initial` or ``False`` otherwise. The
result is computed by calling :meth:`Field.has_changed` for each field in the
form.
.. attribute:: Form.changed_data
The ``changed_data`` attribute returns a list of the names of the fields whose
values in the form's bound data (usually ``request.POST``) differ from what was
provided in :attr:`~Form.initial`. It returns an empty list if no data differs.
>>> f = ContactForm(request.POST, initial=data)
>>> if f.has_changed():
... print("The following fields changed: %s" % ", ".join(f.changed_data))
Accessing the fields from the form
----------------------------------