amcharts with Rails - 不抓取数据源

Question

我目前正在关注： http:// /railsontherun.com/2007/10/04/sexy-charts-in-less-than-5-months/

我很容易地完成了这一切，但是当查看带有图表的页面时，它加载了（在 Flash 中）一个带有错误的黑色矩形：

“加载文件时出错 http://localhost:3000/reports/ population.xml”

评论中有人说这可能与 XML 构建器文件中的代码有关。

  xml.instruct!  :xml, :version=>"1.0", :encoding=>"UTF-8"
  xml.chart do
    # xml.message "You can broadcast any message to chart from data XML file", :bg_color => "#FFFFFF", :text_color => "#000000"
    xml.series do    
      @cities.each_with_index do |city, index|
        xml.value city.name,  :xid => index
      end
    end

    xml.graphs do
     #the gid is used in the settings file to set different settings just for this graph
      xml.graph :gid => 'population' do
        @cities.each_with_index do |city, index|
          population = city.population
          case population
            # When the population is > 1 million, show the bar in red/pink
            when > 100000
              xml.value value,  :xid => index, :color => "#ff43a8", :gradient_fill_colors => "#960040,#ff43a8", :description => level
            else
              xml.value value,  :xid => index, :color => "#00C3C6", :gradient_fill_colors => "#009c9d,#00C3C6", :description => level
            end
        end
      end
    end

  end

我不太确定错误来自哪里，但我希望得到任何帮助！

最好的， 艾略特

Answer 1

我在那一行中发现了这一点

          xml.value value,  :xid => index, :color => "#00C3C6", :gradient_fill_colors => "#009c9d,#00C3C6", :description => level

，第二个“值”和“级别”变量没有定义。一旦它们完成，一切就正常了。