0
我得到这个不错的XML时,有在字段中的数据:轨道3 XML构建:不返回任何XML元素时,有没有数据
<DescriptiveDetail>
<ProductComposition>00</ProductComposition>
<ProductForm>01</ProductForm>
<Measure>
<MeasureType>01</MeasureType>
<MeasureType>198</MeasureType>
<MeasureType>mm</MeasureType>
</Measure>
</DescriptiveDetail>
当没有数据,我想获得这:
<DescriptiveDetail>
<ProductComposition>00</ProductComposition>
</DescriptiveDetail>
但是,相反,我得到这个:
<DescriptiveDetail>
<ProductComposition></ProductComposition>
<ProductForm></ProductForm>
<Measure>
<MeasureType></MeasureType>
<MeasureType></MeasureType>
<MeasureType></MeasureType>
</Measure>
</DescriptiveDetail>
我怎么不返回的XML元素时,有没有数据?
(而且只是出于兴趣,如果你知道,你怎么返回自动关闭标签,例如
<Measure/>
)
这里是我的XML构建代码(在满,相关位在中间):
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
谢谢你的想法。问题是,@isbnlist中的一些属性会有数据,有些则不会。 (@isbnlist Isbn.all) – snowangel 2011-06-15 13:16:24
那么,另一种方法是检查每行是否属性有数据: xml.ProductIDType productcode.idtype除非productcode.idtype.nil? – yagooar 2011-06-15 14:51:25
当然!非常感谢@yagooar。 – snowangel 2011-06-15 14:59:50