Mastico

Make common queries simple, and make some complex queries possible.

Using a basic client, creating Elasticsearch queries requires specialist knowledge or hours of comparing Stack Overflow posts.

Chewy makes managing and updating indexes simple, but the query interface remains the same.

Mastico creates queries based on a list of fields:

query = FooIndex.query
query = Mastico::Query.new(
  fields: [:title, :description], query: "ciao"
).apply(query)

This creates a series of queries: word, prefix, infix and fuzzy matches of the word ciao against the supplied fields.

What if I want to block some words ("Stop words") of give more weight to others?

def weight(word)
  case word
  when "information"
    0
  else
    1.0
  end
end

query = Mastico::Query.new(
  fields: [:title, description],
  word_weight: method(:weight),
  query: "Information is power"
).apply(query)

What if I don't want all the different types of matching?

query = Mastico::Query.new(
  fields: {title: {boost: 4.0, types: [:word]} },
  query: "Simple"
).apply(query)

This will return only the word type search (i.e. whole words) for the attribute title.

The types of matching that are available are:

• :word - whole words,
• :prefix - the beginning of words,
• :infix - some part of a word,
• :fuzzy - similar words.

Add this line to your application's Gemfile:

gem 'mastico'

And then execute:

$ bundle

Or install it yourself as:

$ gem install mastico

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/cantierecreativo/mastico. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.