.. _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Prior versions of Django included an outdated, undocumented comment system.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;