According to the Thinking Sphinx docs...
Turning on delta indexing does not remove the need for regularly running a full re-index ...
So I set up this cron job...
50 10 * * * cd /var/www/my_app/current
&& /opt/ruby/bin/rake thinking_sphinx:index RAILS_ENV=production
>> /var/www/my_app/current/log/reindexing.log 2>&1
Is that a reasonable way to do it? Should I be doing something different?