How to use Tire for "MoreLikeThis" query of ElasticSearch

Question

I would like execute this exemple :

$ curl -XGET 'http://localhost:9200/twitter/tweet/1/_mlt?mlt_fields=tag,content&min_doc_freq=1'

with Tire gem. It's poossible ?

My goal to search document related to another document.

Konrad Reiche · Answer 1 · 2013-08-25T19:03:42.773

3

It is not implemented directly in tire. Karmi, however, has implemented it as a tire extension in the tire-contrib repository.

Source Code: more_like_this.rb
Add by adding gem 'tire-contrib'
more_like_this_field(:tag, like_text, options = {min_doc_freq: 1})

edited Aug 25 '13 at 19:03

answered Aug 25 '13 at 18:58

Konrad Reiche

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Thanks for your aswer. I am not sure to build similar request with this extension. Your exemple use "like_text" and not document id to find related document. – Bastien D Aug 25 '13 at 21:17
@BastienD If I have understood this correctly then is this method part of the Tire DSL which means you can add it to a search block in tire like any other method (query, size, etc.). The document id is defined in your query and you leave the like text null. – Konrad Reiche Aug 25 '13 at 21:32

score 0 · Answer 2 · answered Aug 13 '15 at 10:25

Okay the internet forgot to include a single example of this call (including the source project), so here is one style of it.

related_articles = Article.search {
  query {
    more_like_this("#{current_article.title} #{current_article.body}",
      fields: [:title, :description],
      percent_terms_to_match: 0.1,
      min_term_freq: 1,
      min_doc_freq: 1
    )
  }
}
puts related_articles.results.count
puts related_articles.results.first.title if related_articles.present?

The gotcha here are the min_term_freq and min_doc_freq params above. They default to 2 and 5 respectively in ElasticSearch, which makes it easy to get confused while testing this.

How to use Tire for "MoreLikeThis" query of ElasticSearch

2 Answers2