in my app, i find a bunch of users in a group with the following line
group_users = Group.find(params[:id]).users
i need to take this group and add some users to it, but i found out the
hard way that
group_users << new_user
does not work the way i want it to. instead of just adding a user to
the collection of users i have, it also adds the user to the group that
i originally pulled the users from.