How to work with locations (geo) in Tire

Tire currently does not expose the (awesome!) „Geo Location and Search” support in ElasticSearch.

However, it's simple to define proper mappings for you location-based documents, and it's possible to search them, either via the Tire.search DSL method by passing it a Hash, or descending a level down, and using Tire::Configuration.client.get <MY QUERY AS A HASH> method.

The following example illustrates the point:

require 'tire'
require 'active_record'

Tire.index('venues') { delete }

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ":memory:" )

ActiveRecord::Migration.verbose = false
ActiveRecord::Schema.define(version: 1) do
  create_table :venues do |t|
    t.string   :title, :latitude, :longitude
  end
end

class Venue < ActiveRecord::Base
  include Tire::Model::Search
  include Tire::Model::Callbacks

  tire do
    mapping do
      indexes :title,   type: 'string', analyzer: 'snowball'
      indexes :lat_lon, type: 'geo_point'
    end
  end

  def lat_lon
    [latitude, longitude].join(',')
  end

  def to_indexed_json
    to_json(only: ['title'], methods: ['lat_lon'])
  end
end

Venue.create title: 'Pizzeria Pomodoro', latitude: "41.12", longitude: "-71.34"

Venue.tire.index.refresh

query = { query: { filtered: { query: { match_all: ''} }, filter: { geo_distance: { distance: '100km', lat_lon: "41,-71" } } } }

puts "", "The query:", '-'*80, query.to_json

s = Tire.search 'venues', query

puts "", "Results:", '-'*80, s.results.inspect