I have a topic model which has_many replies.
On my topic index page I would like to be able to sort the topics by
the number of replies.
In my topic model I have defined
And in my controller I have tried
@topics = Topic.find(:all, :conditions => ["forum_id = ?",
@forum.id], :order => "total_replies DESC")
but I get the error Mcolumn "total_replies" does not exist
I know the column doesn't exist, but the question is, how can I get
the 'total_replies' to behave as a column.