posts_controller.rb

def index
     scope = if current_user
       case @filter
       when :all;          Post.not_private.unfiltered
       when :all_unread;   Post.not_private.unread(current_user)
       when :restricted;   Post.not_private.restricted
       when :unrestricted; Post.not_private.unrestricted
       when :interesting;  Post.not_private.interesting(current_user)
       when :my;           Post.not_private.has_unread_comments(current_user).my(current_user)
       when :my_all;       Post.not_private.my(current_user)
       when :inbox;        Post.not_not_private.accessible_by(current_user)
       else                Post.not_private.unfiltered
       end
     else
       Post.not_private.unrestricted
     end

    scope = scope.not_hidden unless current_user && current_user.is_admin?
   @posts = scope.descend_by_created_at.paginate :page => params[:page], :include => :user
 end