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Code Issues 25 Releases Wiki Activity

Fixed #34172 -- Improved ModelAdmin.get_urls example.

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Sylvain Fankhauser 2022-12-07 11:23:13 +01:00 committed by GitHub
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47
docs/ref/contrib/admin/index.txt
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@ -1565,7 +1565,8 @@ templates used by the :class:`ModelAdmin` views:
The ``get_urls`` method on a ``ModelAdmin`` returns the URLs to be used for
that ModelAdmin in the same way as a URLconf. Therefore you can extend
them as documented in :doc:`/topics/http/urls`::
them as documented in :doc:`/topics/http/urls`, using the
``AdminSite.admin_view()`` wrapper on your views::
from django.contrib import admin
from django.template.response import TemplateResponse
@ -1575,7 +1576,7 @@ templates used by the :class:`ModelAdmin` views:
def get_urls(self):
urls = super().get_urls()
my_urls = [
path('my_view/', self.my_view),
path('my_view/', self.admin_site.admin_view(self.my_view))
]
return my_urls + urls
@ -1598,6 +1599,18 @@ templates used by the :class:`ModelAdmin` views:
...
{% endblock %}
.. note::
Notice how the ``self.my_view`` function is wrapped in
``self.admin_site.admin_view``. This is important, since it ensures two
things:
#. Permission checks are run, ensuring only active staff users can
access the view.
#. The :func:`django.views.decorators.cache.never_cache` decorator is
applied to prevent caching, ensuring the returned information is
up-to-date.
.. note::
Notice that the custom patterns are included *before* the regular admin
@ -1609,36 +1622,6 @@ templates used by the :class:`ModelAdmin` views:
``/admin/myapp/mymodel/my_view/`` (assuming the admin URLs are included
at ``/admin/``.)
However, the ``self.my_view`` function registered above suffers from two
problems:
* It will *not* perform any permission checks, so it will be accessible
to the general public.
* It will *not* provide any header details to prevent caching. This means
if the page retrieves data from the database, and caching middleware is
active, the page could show outdated information.
Since this is usually not what you want, Django provides a convenience
wrapper to check permissions and mark the view as non-cacheable. This
wrapper is ``AdminSite.admin_view()`` (i.e. ``self.admin_site.admin_view``
inside a ``ModelAdmin`` instance); use it like so::
class MyModelAdmin(admin.ModelAdmin):
def get_urls(self):
urls = super().get_urls()
my_urls = [
path('my_view/', self.admin_site.admin_view(self.my_view))
]
return my_urls + urls
Notice the wrapped view in the fifth line above::
path('my_view/', self.admin_site.admin_view(self.my_view))
This wrapping will protect ``self.my_view`` from unauthorized access and
will apply the :func:`django.views.decorators.cache.never_cache` decorator to
make sure it is not cached if the cache middleware is active.
If the page is cacheable, but you still want the permission check to be
performed, you can pass a ``cacheable=True`` argument to
``AdminSite.admin_view()``::