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Added better error handling in the basic feed class example. Refs #5855
git-svn-id: http://code.djangoproject.com/svn/django/trunk@6741 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -201,6 +201,8 @@ the feed.
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An example makes this clear. Here's the code for these beat-specific feeds::
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from django.contrib.syndication import FeedDoesNotExist
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class BeatFeed(Feed):
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def get_object(self, bits):
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# In case of "/rss/beats/0613/foo/bar/baz/", or other such clutter,
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@ -213,6 +215,8 @@ An example makes this clear. Here's the code for these beat-specific feeds::
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return "Chicagocrime.org: Crimes for beat %s" % obj.beat
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def link(self, obj):
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if not obj:
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raise FeedDoesNotExist
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return obj.get_absolute_url()
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def description(self, obj):
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@ -246,11 +250,18 @@ request to the URL ``/rss/beats/0613/``:
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each of ``title``, ``link`` and ``description``, Django follows this
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algorithm:
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* First, it tries to call a method, passing the ``obj`` argument, where
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``obj`` is the object returned by ``get_object()``.
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* First, it tries to call a method, passing the ``obj`` argument,
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where ``obj`` is the object returned by ``get_object()``.
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* Failing that, it tries to call a method with no arguments.
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* Failing that, it uses the class attribute.
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Inside the ``link()`` method, we handle the possibility that ``obj``
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might be ``None``, which can occur when the URL isn't fully specified. In
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some cases, you might want to do something else in this case, which would
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mean you'd need to check for ``obj`` existing in other methods as well
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(the ``link()`` method is called very early in the feed generation
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process, so is a good place to bail out early).
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* Finally, note that ``items()`` in this example also takes the ``obj``
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argument. The algorithm for ``items`` is the same as described in the
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previous step -- first, it tries ``items(obj)``, then ``items()``, then
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