ruby on rails - Nokogiri XML file output is located where? -

i need generate xml file ruby and/or rails , have nokogiri installed.

1. in file ruby code go generate xml file?
2. how tell nokogiri generate xml , put file?
3. where xml output located?

here code controller file:

class monkeytalkcontroller < applicationcontroller  require 'rubygems' require 'nokogiri'    def edit    end    def update #debugger     render :text => monkeytalk.new(params).build_xml      builder = nokogiri::xml::builder.new(:encoding => 'utf-8') |xml|       xml.root {   xml.products{          xml.widget {           xml.id_ "10"           xml.name "awesome widget"           }         }       }        doc = nokogiri::xml.parse(params)       file.open('xml.out', 'w') |fo|       fo.print doc.to_s       end     end     puts builder.to_xml    end  end 

i need basic understanding of structure of ruby , rails applications , how nokogiri works.

to generate xml file not need rails. ruby (and nokogiri or oder builder) suffice.

first, have build xml:

builder = nokogiri::xml::builder.new(:encoding => 'utf-8') |xml|   xml.root     xml.products       xml.widget         xml.id_ "10"         xml.name "awesome widget"       end     end   end end 

you can xml string builder using builder.to_xml:

xml_string = builder.to_xml # => "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<root>\n  <products>\n    <widget>\n      <id>10</id>\n      <name>awesome widget</name>\n    </widget>\n  </products>\n</root>\n" 

to save string file, use file.open , file#write:

# open file instance path '/path/to/file.xml' in write mode (-> 'w') file.open('/path/to/file.xml', 'w') |file|   # write xml string generated above file   file.write xml_string end 

an important note: have make sure close files opened if no longer need them. file.open block (as used in snipped above) automatically close file after code in block executed...