ruby-on-rails - 在 Nokogiri 中从 XML 中选择值 'doubled up'

Question

<TrainingCenterDatabase xmlns="http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2 http://www.garmin.com/xmlschemas/TrainingCenterDatabasev2.xsd">
  <Activities>
    <Activity Sport="Running">
      <Id>2011-04-29T15:29:42Z</Id>
      <Lap StartTime="2011-04-29T15:29:42Z">
        <TriggerMethod>Manual</TriggerMethod>
        <Track>
          <Trackpoint>
            <AltitudeMeters>298.6267090</AltitudeMeters>
            <Position>
              <LatitudeDegrees>52.4864997</LatitudeDegrees>
              <LongitudeDegrees>13.3531452</LongitudeDegrees>
            </Position>
          </Trackpoint>
        </Track>
      </Lap>
      <Lap StartTime="2011-04-29T15:29:42Z">
        <TriggerMethod>Manual</TriggerMethod>
        <Track>
          <Trackpoint>
            <AltitudeMeters>498.6267090</AltitudeMeters>
            <Position>
              <LatitudeDegrees>52.4864997</LatitudeDegrees>
              <LongitudeDegrees>13.3531452</LongitudeDegrees>
            </Position>
          </Trackpoint>
         </Track>
      </Lap>
    </Activity>
  </Activities>
</TrainingCenterDatabase>

doc = Nokogiri::XML(xml)
node_values = doc.xpath('//xmlns:Track', 'xmlns' => 'http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2').map do |i|     
  {'AltitudeMeters' => i.xpath('//xmlns:AltitudeMeters').text}
end
nl.debug(node_values)

我的结果总是重复出现:

[{"AltitudeMeters"=>"298.6267090498.6267090"},
 {"AltitudeMeters"=>"298.6267090498.6267090"}]

我想要这样的东西:

[{"AltitudeMeters"=>"298.6267090"},
 {"AltitudeMeters"=>"498.6267090"}]

问题可能是 xmlns。但我不知道解决办法。

Answer 1

doc = Nokogiri::XML(xml)
node_values = doc.xpath('//xmlns:Track//xmlns:AltitudeMeters', 'xmlns' => 'http://www.garmin.com/xmlschemas/TrainingCenterDatabase/v2').map do |i|     
    {'AltitudeMeters' => i.text}
end
p node_values
# => [{"AltitudeMeters"=>"298.6267090"}, {"AltitudeMeters"=>"498.6267090"}]