I get this nice XML when there's data in the fields:
<DescriptiveDetail>
<ProductComposition>00</ProductComposition>
<ProductForm>01</ProductForm>
<Measure>
<MeasureType>01</MeasureType>
<MeasureType>198</MeasureType>
<MeasureType>mm</MeasureType>
</Measure>
</DescriptiveDetail>
And when there isn't data, I'd like to get this:
<DescriptiveDetail>
<ProductComposition>00</ProductComposition>
</DescriptiveDetail>
But instead I'm getting this:
<DescriptiveDetail>
<ProductComposition></ProductComposition>
<ProductForm></ProductForm>
<Measure>
<MeasureType></MeasureType>
<MeasureType></MeasureType>
<MeasureType></MeasureType>
</Measure>
</DescriptiveDetail>
How do I return no XML element when there's no data?
(And just out of interest, if you know, how do you return a self closing tag, e.g.
<Measure/>
)
Here's my XML builder code (in full, the relevant bit is in the middle):
xml.instruct!(:xml, :encoding => "ISO-8859-1")
xml.ONIXMessage(:release=>"3.0") do
xml.Header do
xml.Sender
xml.SenderName
end
@isbnlist.each do |isbn|
xml.Product do
xml.RecordReference isbn.id
xml.NotificationType isbn.notificationtype
isbn.productcodes.each do |productcode|
xml.ProductIdentifier do
xml.ProductIDType productcode.idtype
xml.IDValue productcode.idvalue
end
end
xml.DescriptiveDetail do
xml.ProductComposition isbn.descriptivedetail_productcomposition_productcomposition
xml.ProductForm isbn.descriptivedetail_productcomposition_productform
isbn.measurements.each do |measurement|
xml.Measure do
xml.MeasureType measurement.descriptivedetail_measure_measuretype
xml.MeasureType measurement.descriptivedetail_measure_measurement
xml.MeasureType measurement.descriptivedetail_measure_measureunitcode
end
end
xml.TitleDetail do
xml.TitleType isbn.descriptivedetail_titledetail_titletype
xml.TitleElement do
xml.TitleElementLevel isbn.descriptivedetail_titledetail_titleelement_titleelementlevel
xml.TitlePrefix isbn.descriptivedetail_titledetail_titleelement_titleprefix
xml.TitleWithoutPrefix isbn.descriptivedetail_titledetail_titleelement_titlewithoutprefix
end
xml
end
end
end
end
end
Have you tried just to check if @isbnlist is empty, and if so, use a conditional statement to either iterate through all the elements or just print out the short / empty version?