You don't have to use Builder to create nodes. Nokogiri allows several ways of defining them. Your question isn't asked well as it's missing essential information, but this will get you started:
require 'nokogiri'
doc = Nokogiri::HTML(<<EOT)
<html>
<head></head>
<body>
</body>
</html>
EOT
puts doc.to_html
# >> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# >> <html>
# >> <head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head>
# >> <body>
# >> </body>
# >> </html>
I can add a table using a string containing the HTML:
body = doc.at('body')
body.inner_html = "<table><tbody><tr><td>foo</td><td>bar</td></tr></tbody></table>"
puts doc.to_html
# >> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# >> <html>
# >> <head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head>
# >> <body><table><tbody><tr>
# >> <td>foo</td>
# >> <td>bar</td>
# >> </tr></tbody></table></body>
# >> </html>
Modify the string generation to contain the HTML you need, let Nokogiri do the heavy lifting, and you're done. It's easier to read and maintain.
inner_html= is defined as:
inner_html=(node_or_tags)
node_or_tags means you can pass a node created using Builder, snipped from some other place in the DOM, or a string containing the markup.
Similarly:
table = Nokogiri::XML::Node.new('table', doc)
table.class # => Nokogiri::XML::Element
table.add_child('<tbody><tr><td>foo</td><td>bar</td></tr></tbody>')
body = doc.at('body')
body.inner_html = table
puts doc.to_html
# >> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
# >> <html>
# >> <head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head>
# >> <body><table><tbody><tr>
# >> <td>foo</td>
# >> <td>bar</td>
# >> </tr></tbody></table></body>
# >> </html>
Note that table is a Nokogiri::XML::Element. HTML nodes are a subclass of XML nodes so don't let that confuse you.
The tutorials are good starting points for trying anything with Nokogiri. In this case "Modifying an HTML / XML Document" is useful. Also the "Cheat sheet" is chock-full of goodness. Finally, "Questions tagged [nokogiri]" reveals all the top questions on Stack Overflow.
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