controller_example.rb

  def create
    @user = User.new(params[:user])
    pw_match = params[:user][:password] == params[:password_confirmation]
    if pw_match && @user.save
      flash[:notice] = "User created"
      redirect_to admin_url
    else
      @user.errors.add(:password, "doesn't match conformation") unless pw_match
      render :action => "new"
    end
  end

  def enable
    @user = User.find(params[:id])
    if @user.enable
      flash[:notice] = 'User enabled'
    else
      flash[:notice] = 'There was a problem enabling the user'
    end
    redirect_to user_url # yes reload the page beotch!
  end