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I want ElasticSearch (Tire gem to be specific) to return the result based on the number of times a keyword appears in the fields. For example, I index the field title in a model called Article. I have two objects, the first object has the title value 'Funny Funny subject' while the second object has the title value 'Funny subject'. I want to index in such a way that if I search for the keyword 'Funny', the first object will return first since it has two 'Funny' words appearing in the title. Is it possible to do this via Tire? What is the indexing method called as well?

RubyFanatic
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1 Answers1

2

Here a working sample, the key factor here is the boostvalue that has to be high enough and you can't use wildcharts in the query.

require 'tire'
require 'yajl/json_gem'

articles = [
  { :id => '0', :type => 'article', :title => 'nothing funny'},
  { :id => '1', :type => 'article', :title => 'funny'},
  { :id => '2', :type => 'article', :title => 'funny funny funny'}
]

Tire.index 'articles' do
  import articles
end

Tire.index 'articles' do
  delete

  create :mappings => {
    :article => {
      :properties => {
        :id       => { :type => 'string', :index => 'not_analyzed', :include_in_all => false },
        :title    => { :type => 'string', :boost => 50.0,            :analyzer => 'snowball'  },
        :tags     => { :type => 'string', :analyzer => 'keyword'                             },
        :content  => { :type => 'string', :analyzer => 'snowball'                            }
      }
    }
  }

  import articles do |documents|
    documents.map { |document| document.update(:title => document[:title].downcase) }
  end

  refresh
end

s = Tire.search('articles') do
  query do
    string "title:funny"
  end
end

s.results.each do |document|
  puts "* id:#{ document.id } #{ document.title } score: #{document._score}"
end

gives

* id:2 funny funny funny score: 14.881571
* id:1 funny score: 14.728935
* id:0 nothing funny score: 9.81929
peter
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  • Could you elaborate a bit more how you'd achieve that goal? Boosting the title field? – javanna Aug 30 '12 at 13:48
  • see http://www.elasticsearch.org/guide/reference/mapping/boost-field.html for the meaning of boost, basically it determines the resulting score compared with the result of other fields/tags etc the higher the hits * boostlevel the more likely this hit goes up in de index ranking – peter Aug 30 '12 at 15:34
  • Unfortunately it doesn't work for me Peter. I added high boost for a field similar to title but it doesn't sort correctly as intended. – RubyFanatic Aug 30 '12 at 19:58
  • can you publish your data so that we can test ? – peter Aug 30 '12 at 22:30