newforms-admin: Fixed #6075 -- Implemented max_num on formsets and model formsets. Added a hook on InlineModelAdmin to customize in the admin interface.

git-svn-id: http://code.djangoproject.com/svn/django/branches/newforms-admin@7613 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 28 insertions, 0 deletions

diff --git a/docs/modelforms.txt b/docs/modelforms.txt
index b9332bc59e..f2222c1fc0 100644
--- a/docs/modelforms.txt
+++ b/docs/modelforms.txt
@@ -449,6 +449,34 @@ model instances without any database interaction::
 This gives you the ability to attach data to the instances before saving them
 to the database.
 
+Limiting the number of objects editable
+---------------------------------------
+
+Similar to regular formsets you can use the ``max_num`` parameter to
+``modelformset_factory`` to limit the number of forms displayed. With
+model formsets this will properly limit the query to only select the maximum
+number of objects needed::
+
+    >>> Author.objects.order_by('name')
+    [<Author: Charles Baudelaire>, <Author: Paul Verlaine>, <Author: Walt Whitman>]
+    
+    >>> AuthorFormSet = modelformset_factory(Author, max_num=2, extra=1)
+    >>> formset = AuthorFormSet(queryset=Author.objects.order_by('name'))
+    >>> formset.initial
+    [{'id': 1, 'name': u'Charles Baudelaire'}, {'id': 3, 'name': u'Paul Verlaine'}]
+
+If the value of ``max_num`` is less than the total objects returned it will
+fill the rest with extra forms::
+
+    >>> AuthorFormSet = modelformset_factory(Author, max_num=4, extra=1)
+    >>> formset = AuthorFormSet(queryset=Author.objects.order_by('name'))
+    >>> for form in formset.forms:
+    ...     print form.as_table()
+    <tr><th><label for="id_form-0-name">Name:</label></th><td><input id="id_form-0-name" type="text" name="form-0-name" value="Charles Baudelaire" maxlength="100" /><input type="hidden" name="form-0-id" value="1" id="id_form-0-id" /></td></tr>
+    <tr><th><label for="id_form-1-name">Name:</label></th><td><input id="id_form-1-name" type="text" name="form-1-name" value="Paul Verlaine" maxlength="100" /><input type="hidden" name="form-1-id" value="3" id="id_form-1-id" /></td></tr>
+    <tr><th><label for="id_form-2-name">Name:</label></th><td><input id="id_form-2-name" type="text" name="form-2-name" value="Walt Whitman" maxlength="100" /><input type="hidden" name="form-2-id" value="2" id="id_form-2-id" /></td></tr>
+    <tr><th><label for="id_form-3-name">Name:</label></th><td><input id="id_form-3-name" type="text" name="form-3-name" maxlength="100" /><input type="hidden" name="form-3-id" id="id_form-3-id" /></td></tr>
+
 Using ``inlineformset_factory``
 -------------------------------