flashing notice from a model throws

I have a view (list_users) that calls destroy_user and I'd like to get it to flash an error within the view. The code below works for the raise, but if I comment it out and try the 2 lines below it, I get the following error:

"undefined local variable or method `flash' for #<User:0x28fd3f4>"

Any ideas?

user_controller.rb:

  def destroy_user     if request.post?       user = User.find(params[:id])       user.destroy       flash[:notice] = "user has been deleted!"     end     redirect_to(:action => :list_users)   end

user.rb (model):

def after_destroy     if User.count.zero?       raise "Can't delete the last user"       # I'd like it to do this, but can't seem to make it work:       # flash.now[:notice] = "Can't remove the last user"       # redirect_to(:action => "list_users")     end   end