If members of the site can only see content that has been published by their group of users then I would simply add a group_id column to the tables containing content and filter the output by the users group.

carbontwelve said:

If members of the site can only see content that has been published by their group of users then I would simply add a group_id column to the tables containing content and filter the output by the users group.

So add group_id to every table? O.o Would proberbly make it easier, but it just seems... wrong xD

You could in that case have one polymorphic table for group permissions - its the same thing but concentrated into one area.