Question

I’m trying to generate KML using Builder. I know their are some options out there to help with this but I will be doing some 2.2 specific things that aren’t supported by the KML gems I’ve looked at and would generally like to be able to accomplish this leveraging just an XML framework.

I get a tag at the end of the file when rendering my kml/xml. I strongly suspect I’m missing something basic with setting up my Builder object or with how I’m rendering the output it. Here’s a simple example that demonstrates the issue:

def kml2dot2
  @site = Site.find(params[:id])
  xml = Builder::XmlMarkup.new(:indent => 2)
  xml.instruct!
  xml.kml("xmlns" => "http://www.opengis.net/kml/2.2") {
    xml.Placemark do
      xml.name @site.mapNameFull
      xml.Point do
        xml.coordinates @site.lat.to_s + "," + @site.lng.to_s + ",0"
      end
    end
  }
  render :text => xml, :type=>"text/kml"

end 

Produces:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Placemark>
    <name>Seattle City Hall</name>
    <Point>
      <coordinates>47.6040746,-122.33005,0</coordinates>
    </Point>
  </Placemark>
</kml>
<to_s/>

I’m trying to understand how to avoid the <to_s/> being included and what I’m doing wrong with Builder. Thanks for any insight.

Answer 1

You don’t need to initialize an XML builder object. Just use the integrated builder template handler.

1. Call the template kml2dot2.xml.builder
2. Write the code directly in the view

Example

def kml2dot2
  @site = Site.find(params[:id])
end

# kml2dot2.xml.builder
xml.kml("xmlns" => "http:// www.opengis.net/kml/2.2") do
  xml.Placemark do
    xml.name @site.mapNameFull
    xml.Point do
       xml.coordinates "#{@site.lat},#{@site.lng},0"
    end
  end
end