Commit 0d1a9d20 authored by Peter Sagerson's avatar Peter Sagerson
Browse files

Fixes a race condition in the documentation. 

The example for django.contrib.admin.ModelAdmin.get_form modifies
self.exclude. However, since ModelAdmin instances are global and have no
thread- or request-locality, this is not safe for concurrent
requests.[1] This updated documentation demonstrates a safe method to
override admin forms on a per-request basis.

[1] https://groups.google.com/forum/#!topic/django-users/AmoUDtEefyA
parent d2d6c0c0

docs/ref/contrib/admin/index.txt

+9 −5
Original line number Diff line number Diff line
@@ -1488,16 +1488,20 @@ templates used by the :class:`ModelAdmin` views: 
    Returns a :class:`~django.forms.ModelForm` class for use in the admin add

    and change views, see :meth:`add_view` and :meth:`change_view`.



    If you wanted to hide a field from non-superusers, for example, you could

    override ``get_form`` as follows::

    The base implementation uses :func:`~django.forms.models.modelform_factory`

    to subclass :attr:`~form`, modified by attributes such as :attr:`~fields`

    and :attr:`~exclude`. So, for example, if you wanted to offer additional

    fields to superusers, you could swap in a different base form like so::



        class MyModelAdmin(admin.ModelAdmin):

            def get_form(self, request, obj=None, **kwargs):

                self.exclude = []

                if not request.user.is_superuser:

                    self.exclude.append('field_to_hide')

                if request.user.is_superuser:

                    kwargs['form'] = MySuperuserForm

                return super(MyModelAdmin, self).get_form(request, obj, **kwargs)



    You may also simply return a custom :class:`~django.forms.ModelForm` class

    directly.



.. method:: ModelAdmin.get_formsets(request, obj=None)



    .. deprecated:: 1.7