eventful_parsing.rb

# los requires no son necesarios dentro de rails, obviamente :p
require 'rubygems'
require 'active_support'

# format_event retorna un hash formateado a como querés, por lo cual al resultado le podés hacer .to_json
def format_event(event_hash)
  # Si no hay imagenes retorna un hash con info "vacía"
  return {:totalImages => '0', :images => {}} if (event_hash['images'].nil? || event_hash['images']['image'].nil?)
  # por legibilidad está en varias líneas :p
  {
    # el totalImages lo querés como cadena, cierto?
    'totalImages' => event_hash['images']['image'].count.to_s, 
    'images' => 
      event_hash['images']['image'].map {|image| {
        :id => image['id'].to_s, 
        :sizes => %w[small medium thumb].map {|size| 
          { size => { 
            :url => image[size]['url'].to_s, :caption => image[size]['caption'].to_s,
            :width => image[size]['width'].to_s, :height => image[size]['height'].to_s  
            } 
          }
        } 
      }
    } 
  }
end


# El xml que me enviaste: 
# más abajo uso format_event para pasar éste xml a json
xml = <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<event id="E0-001-027213439-8">
  <url>http://eventful.com/newyorkcity/events/lukas-rossi-highline-ballroom-/E0-001-027213439-8</url>
  <title>Lukas Rossi at The Highline Ballroom</title>
  <description>Singer-Songwriter Lukas Rossi Takes His Unique Rock Style Acoustic for this ALL AGES show at Highline Ballroom.

Make the night a truly special experience! Have dinner with Lukas and be his guest for the show!

For details please visit http://lukasrossi.com/news

For further details on other upcoming shows in this area, go to http://lukasrossi.com</description>
  <start_time>2010-01-31 20:00:00</start_time>
  <stop_time/>
  <all_day>0</all_day>
  <tz_id/>
  <tz_olson_path/>
  <tz_country/>
  <tz_city/>
  <venue_name>Highline Ballroom</venue_name>
  <venue_id>V0-001-001140718-3</venue_id>
  <venue_type>Bar/Night Club</venue_type>
  <venue_display>1</venue_display>
  <address>431 West Sixteenth Street</address>
  <city>New York</city>
  <region>New York</region>
  <region_abbr>NY</region_abbr>
  <postal_code>10011</postal_code>
  <country>United States</country>
  <country_abbr2>US</country_abbr2>
  <country_abbr>USA</country_abbr>
  <latitude>40.74307</latitude>
  <longitude>-74.005716</longitude>
  <geocode_type>EVDB Geocoder</geocode_type>
  <created>2009-12-26 20:03:03</created>
  <modified>2009-12-26 20:03:03</modified>
  <owner>monkeyhq</owner>
  <privacy>1</privacy>
  <free/>
  <price/>
  <withdrawn>0</withdrawn>
  <withdrawn_note/>
  <recurrence/>
  <parents/>
  <children/>
  <links/>
  <comments>
    <comment id="">
      <text/>
      <username/>
      <time/>
    </comment>
  </comments>
  <trackbacks/>
  <performers>
    <performer>
      <id>P0-001-000080359-4</id>
      <url>http://eventful.com/performers/lukas-rossi-/P0-001-000080359-4?utm_source=apis&amp;utm_medium=apim&amp;utm_campaign=apic</url>
      <name>Lukas Rossi</name>
      <short_bio>Singer/Songwriter</short_bio>
      <creator>monkeyhq</creator>
      <linker>monkeyhq</linker>
    </performer>
  </performers>
  <images>
    <image>
      <id>I0-001-002643459-8</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/643/459-8.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/643/459-8.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/643/459-8.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/643/459-8.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-002643373-9</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/643/373-9.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/643/373-9.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/643/373-9.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/643/373-9.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-002296751-1</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/296/751-1.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/296/751-1.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/296/751-1.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/296/751-1.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-002617058-4</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/617/058-4.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/617/058-4.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/617/058-4.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/617/058-4.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-002511751-5</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/511/751-5.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/511/751-5.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/511/751-5.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/511/751-5.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-002511750-6</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/002/511/750-6.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/002/511/750-6.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/002/511/750-6.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/002/511/750-6.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-001833535-3</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/001/833/535-3.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/001/833/535-3.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/001/833/535-3.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/001/833/535-3.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-001833518-6</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/001/833/518-6.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/001/833/518-6.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/001/833/518-6.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/001/833/518-6.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-001480020-2</id>
      <creator>monkeyhq</creator>
      <url>http://static.eventful.com/images/small/I0-001/001/480/020-2.jpeg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/001/480/020-2.jpeg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/001/480/020-2.jpeg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/001/480/020-2.jpeg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
    <image>
      <id>I0-001-000161587-1</id>
      <creator>KimW</creator>
      <url>http://static.eventful.com/images/small/I0-001/000/161/587-1.jpg</url>
      <width>48</width>
      <height>48</height>
      <thumb>
        <url>http://static.eventful.com/images/thumb/I0-001/000/161/587-1.jpg</url>
        <width>48</width>
        <height>48</height>
      </thumb>
      <small>
        <url>http://static.eventful.com/images/small/I0-001/000/161/587-1.jpg</url>
        <width>48</width>
        <height>48</height>
      </small>
      <medium>
        <url>http://static.eventful.com/images/medium/I0-001/000/161/587-1.jpg</url>
        <width>128</width>
        <height>128</height>
      </medium>
    </image>
  </images>
  <tags>
    <tag id="acoustic">
      <title>acoustic</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="alternative">
      <title>alternative</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="music">
      <title>music</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="pop">
      <title>Pop</title>
      <owner>evdb</owner>
    </tag>
    <tag id="rock">
      <title>rock</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="rockstar">
      <title>rockstar</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="singersongwriter">
      <title>singer-songwriter</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="singles_social">
      <title>singles_social</title>
      <owner>monkeyhq</owner>
    </tag>
    <tag id="ticketmaster">
      <title>ticketmaster</title>
      <owner>evdb</owner>
    </tag>
    <tag id="ticketmastercom">
      <title>ticketmaster.com</title>
      <owner>evdb</owner>
    </tag>
    <tag id="canada">
      <title>canada</title>
      <owner>evdb</owner>
    </tag>
    <tag id="cleavage">
      <title>Cleavage</title>
      <owner>evdb</owner>
    </tag>
    <tag id="concerts">
      <title>concerts</title>
      <owner>evdb</owner>
    </tag>
    <tag id="headspin">
      <title>Headspin</title>
      <owner>evdb</owner>
    </tag>
    <tag id="indie">
      <title>Indie</title>
      <owner>evdb</owner>
    </tag>
    <tag id="losangeles">
      <title>Los Angeles</title>
      <owner>evdb</owner>
    </tag>
    <tag id="lukasrossi">
      <title>Lukas Rossi</title>
      <owner>evdb</owner>
    </tag>
    <tag id="riseelectric">
      <title>Rise Electric</title>
      <owner>evdb</owner>
    </tag>
    <tag id="rock_pop">
      <title>rock_pop</title>
      <owner>evdb</owner>
    </tag>
    <tag id="rockstarsupernova">
      <title>Rock Star Supernova</title>
      <owner>evdb</owner>
    </tag>
    <tag id="songwriter">
      <title>songwriter</title>
      <owner>evdb</owner>
    </tag>
    <tag id="starsdown">
      <title>Stars Down</title>
      <owner>evdb</owner>
    </tag>
    <tag id="supernova">
      <title>Supernova</title>
      <owner>evdb</owner>
    </tag>
    <tag id="toronto">
      <title>Toronto</title>
      <owner>evdb</owner>
    </tag>
  </tags>
  <flags/>
  <calendars/>
  <groups/>
  <going>
    <user>
      <username>gaylejennifer</username>
      <status>going</status>
      <thumb_url/>
    </user>
    <user>
      <username>monkeyhq</username>
      <status>watching</status>
      <thumb_url>http://static.eventful.com/images/thumb/I0-001/002/139/590-2.jpeg</thumb_url>
    </user>
    <user>
      <username>lindsaysevents</username>
      <status>watching</status>
      <thumb_url/>
    </user>
    <user>
      <username>tigereventful2</username>
      <status>watching</status>
      <thumb_url/>
    </user>
    <user>
      <username>DeForbidden</username>
      <status>watching</status>
      <thumb_url/>
    </user>
  </going>
  <properties/>
  <categories>
    <category>
      <id>music</id>
      <name>Concerts | Live Music</name>
    </category>
    <category>
      <id>singles_social</id>
      <name>Nightlife | Singles</name>
    </category>
  </categories>
</event>
EOF


# probando el código
event_hash = Hash.from_xml(xml)['event']
y format_event( event_hash )
puts "\n\nJson formateado:\n\n #{format_event( event_hash ).to_json}"