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73 lines
2.8 KiB
Plaintext
73 lines
2.8 KiB
Plaintext
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=================
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The redirects app
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=================
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Django comes with an optional redirects application. It lets you store simple
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redirects in a database and handles the redirecting for you.
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Installation
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============
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To install the redirects app, follow these two steps:
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1. Add ``"django.contrib.redirects"`` to your INSTALLED_APPS_ setting.
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2. Add ``"django.contrib.redirects.middleware.RedirectFallbackMiddleware"``
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to your MIDDLEWARE_CLASSES_ setting.
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3. Run the command ``django-admin.py install redirects``.
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.. _INSTALLED_APPS: http://www.djangoproject.com/documentation/settings/#installed-apps
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.. _MIDDLEWARE_CLASSES: http://www.djangoproject.com/documentation/settings/#middleware-classes
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How it works
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============
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``django-admin.py install redirects`` creates a ``django_redirects`` table in
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your database. This is a simple lookup table with ``site_id``, ``old_path`` and
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``new_path`` fields.
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The ``RedirectFallbackMiddleware`` does all of the work. Each time any Django
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application raises a 404 error, this middleware checks the redirects database
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for the requested URL as a last resort. Specifically, it checks for a redirect
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with the given ``old_path`` with a site ID that corresponds to the SITE_ID_
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setting.
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* If it finds a match, and ``new_path`` is not empty, it redirects to
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``new_path``.
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* If it finds a match, and ``new_path`` is empty, it sends a 410 ("Gone")
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HTTP header and empty (content-less) response.
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* If it doesn't find a match, the request continues to be processed as
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usual.
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The middleware only gets activated for 404s -- not for 500s or responses of any
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other status code.
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Note that the order of ``MIDDLEWARE_CLASSES`` matters. Generally, you can put
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``RedirectFallbackMiddleware`` at the end of the list, because it's a last
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resort.
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For more on middleware, read the `middleware docs`_.
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.. _SITE_ID: http://www.djangoproject.com/documentation/settings/#site-id
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.. _middleware docs: http://www.djangoproject.com/documentation/middleware/
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How to add, change and delete redirects
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=======================================
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Via the admin interface
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-----------------------
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If you've activated the automatic Django admin interface, you should see a
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"Redirects" section on the admin index page. Edit redirects as you edit any
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other object in the system.
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Via the Python API
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------------------
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Redirects are represented by a standard `Django model`_, which lives in
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`django/contrib/redirects/models/redirects.py`_. You can access redirect
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objects via the `Django database API`_.
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.. _Django model: http://www.djangoproject.com/documentation/model_api/
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.. _django/contrib/redirects/models/redirects.py: http://code.djangoproject.com/browser/django/trunk/django/contrib/redirects/models/redirects.py
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.. _Django database API: http://www.djangoproject.com/documentation/db_api/
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