couchrest_model/examples/word_count/word_count.rb

require File.dirname(__FILE__) + '/../../couchrest'

couch = CouchRest.new("http://localhost:5984")
db = couch.database('word-count-example')
# db.delete! rescue nil
# db = couch.create_db('word-count-example')

%w{america.txt da-vinci.txt outline-of-science.txt ulysses.txt}.each do |book|
  title = book.split('.')[0]
  puts title
  File.open(File.join(File.dirname(__FILE__),book),'r') do |file|
    lines = []
    chunk = 0
    while line = file.gets
      lines << line
      if lines.length > 10
        db.save({
          :title => title,
          :chunk => chunk, 
          :text => lines.join('')
        })
        chunk += 1
        lines = []
      end
    end
  end
end
 
# word_count = {
#   :map => 'function(doc){
#     var words = doc.text.split(/\W/);
#     words.forEach(function(word){
#       if (word.length > 0) emit([word,doc.title],1);
#     });
#   }',
#   :reduce => 'function(key,combine){
#     return sum(combine);
#   }'
# }
# 
# db.delete db.get("_design/word_count") rescue nil
# 
# db.save({
#   "_id" => "_design/word_count",
#   :views => {
#     :count => word_count,
#     :words => {:map => word_count[:map]}
#   }
# })

puts "The books have been stored in your CouchDB. To initiate the MapReduce process, visit http://localhost:5984/_utils/ in your browser and click 'word-count-example', then select view 'words' or 'count'. The process could take about 15 minutes on an average MacBook."