Helper module and class example for type-ahead searching

gistfile1.rb

# Model Mapping example
# Be sure to replicate this with your actual model
class YourModel < ActiveRecord::Base
  include Elasticsearch::Model
  include Elasticsearch::Model::Callbacks

  settings IndexHelper.type_ahead_analysis do
    mappings do
      indexes :id, index: :no
      indexes :screen_name, type: 'string', analyzer: 'autocomplete'
    end
  end

  def as_indexed_json(options = {})
    as_json({ only: [:id, :screen_name] })
  end

  def self.search(term, page, per_page)
    search(
      query: {
        match: {
          screen_name: { query: term }
        }
      }
    ).page(page).per_page(per_page).results
  end
end

# The Helper Module
# Ensure you edit the indexing helper function
module IndexHelper
  def self.type_ahead_analysis
    {
      index: {
        number_of_shards: 1,
        number_of_replicas: 0,
        analysis: {
          filter: {
            autocomplete_filter: { 
              type: 'edge_ngram',
              min_gram: 1,
              max_gram: 20
            }
          },
          analyzer: {
            autocomplete: {
              type: 'custom',
              tokenizer: 'standard',
              filter: [
                'lowercase',
                'autocomplete_filter'
              ]
            }
          }
        }
      }
    }
  end

  # MUST EDIT
  # Ensure that you replace 'your_models' & 'YourModel' below with whatever your model actually is
  def self.index_your_model
    puts 'Deleting your_models index...'
    Elasticsearch::Client.new.indices.delete index: 'your_models' rescue nil
    puts 'Creating your_models index and importing all your_models...'
    YourModel.import force: true
  end
end