Dynamic Node Names

[Spencer Rogers]

Hey all, I'm having trouble using dynamic node names when creating an
XML document in Nokogiri.

For a static node name I would do the following:

xml.myNodeName "This is my node text"

But what if I want to use a dynamic name for my node? I would assume
it would be similar to the example below but I haven't been able to
get it to work... Any ideas?

for item in myItems
xml[item.itemId] item.itemText
end # for each item


I appreciate any assistance you can give, thanks!

Spencer

[Mike Dalessio]

Hi,

On Mon, Sep 20, 2010 at 4:03 PM, Spencer Rogers <spence...@gmail.com> wrote:

Hey all, I'm having trouble using dynamic node names when creating an
XML document in Nokogiri.

For a static node name I would do the following:

xml.myNodeName "This is my node text"

But what if I want to use a dynamic name for my node?  I would assume
it would be similar to the example below but I haven't been able to
get it to work...  Any ideas?

for item in myItems
    xml[item.itemId] item.itemText
end # for each item

I assume you are using the Nokogiri::XML::Builder class? If so, then use Object#send to create your nodes:

node_names = ["foo", "bar", "bazz"]

builder = Nokogiri::XML::Builder.new do |xml|

  xml.root do

    node_names.each { |name| xml.send name, "some content" }

  end

end

puts builder.to_xml

# => <?xml version="1.0"?>

#    <root>

#      <foo>some content</foo>

#      <bar>some content</bar>

#      <bazz>some content</bazz>

#    </root>

If your node names may collide with Object methods (like "id" or "class") then you may want to append an underscore to the method name, which tells the Builder class explicitly that you're creating a node, and not invoking the Object method:

builder = Nokogiri::XML::Builder.new do |xml|

  xml.root do

    node_names.each { |name| xml.send "#{name}_", "some content" }

  end

end

 

I appreciate any assistance you can give, thanks!

Spencer

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