An alternative way which might scale better would be to have your
posts table, your users table, and a posts_users table, joined using a
hasAndBelongsToMany association. That way you don't get those comma-
separated values, which are a complete bitch to deal with if you ever
want to access them us
I have a discussion board (kind of like mini discussion board), where
users can subscribe to a particular Post ( so that when there is a
reply to this post, they get mailed a notification ).
I'm deciding whether or not to store it this way:
posts table
post_id users_subbed_t
