messages_controller.rb

  def create
    @message = Message.new(params[:message])

    respond_to do |format|
      if @message.save
        ContactMailer.deliver_message(@message)
        flash[:notice] = 'Message was successfully created.'
        format.html { redirect_to(@message) }
        format.xml  { render :xml => @message, :status => :created, :location => @message }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @message.errors, :status => :unprocessable_entity }
      end
    end
  end