django1/docs/ref/contrib/comments/upgrade.txt

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.. _ref-contrib-comments-upgrade:
===============================================
Upgrading from Django's previous comment system
===============================================
Prior versions of Django included an outdated, undocumented comment system. Users who reverse-engineered this framework will need to upgrade to use the
new comment system; this guide explains how.
The main changes from the old system are:
* This new system is documented.
* It uses modern Django features like :ref:`forms <topics-forms-index>` and
:ref:`modelforms <topics-forms-modelforms>`.
* It has a single ``Comment`` model instead of separate ``FreeComment`` and
``Comment`` models.
* Comments have "email" and "URL" fields.
* No ratings, photos and karma. This should only effect World Online.
* The ``{% comment_form %}`` tag no longer exists. Instead, there's now two
functions: ``{% get_comment_form %}``, which returns a form for posting a
new comment, and ``{% render_comment_form %}``, which renders said form
using the ``comments/form.html`` template.
Upgrading data
--------------
The data models have changed, as have the table names. To transfer your data into the new system, you'll need to directly run the following SQL:
.. code-block:: sql
BEGIN;
INSERT INTO django_comments
(content_type_id, object_pk, site_id, user_name, user_email, user_url,
comment, submit_date, ip_address, is_public, is_removed)
SELECT
content_type_id, object_id, site_id, person_name, '', '', comment,
submit_date, ip_address, is_public, approved
FROM comments_freecomment;
INSERT INTO django_comments
(content_type_id, object_pk, site_id, user_id, user_name, user_email,
user_url, comment, submit_date, ip_address, is_public, is_removed)
SELECT
content_type_id, object_id, site_id, user_id, '', '', '', comment,
submit_date, ip_address, is_public, is_removed
FROM comments_comment;
UPDATE django_comments SET user_name = (
SELECT username FROM auth_user
WHERE django_comments.user_id = auth_user.id
);
UPDATE django_comments SET user_email = (
SELECT email FROM auth_user
WHERE django_comments.user_id = auth_user.id
);
COMMIT;