A Chewy mixin to make searching a bit nicer

index_searchable.rb

module IndexSearchable
  extend ActiveSupport::Concern

  class_methods do
    def search(options = {})
      queries = searchable_terms.map { |term| term_search(term, options[term.to_sym]) }
      queries << query_search(options[:query])
      queries.compact.reduce(:merge)
    end

    def query_search(query)
      return unless query.present?
      query(query_string: { query: "*#{query.downcase}*" })
    end

    def term_search(name, value)
      raise ArgumentError.new('Name must be specified in term search') if name.blank?
      return unless value.present?

      query(terms: { name.to_s => prepare_terms(value) })
    end

    private

    def searchable_terms
      []
    end

    def prepare_terms(input)
      input = Array.wrap(input)

      # Split any phrases/sentences up into individual words
      terms = input.map do |value|
        value.is_a?(String) ? value.split(' ') : value
      end.flatten

      # Lowercase all strings in input, since we use the standard analyzer which
      # uses a lowercase filter by default.
      terms.map { |value| value.is_a?(String) ? value.downcase : value }
    end
  end
end