Autocomplete Kups Search

autocomplete_search.rb

class AutocompleteSearch
  class << self
    def populate(query_scope)
      query_scope.find_each do |item|
        name = item.label
        json_data = format_data(item)
        name.length.times do |n|
          key = name[0, n+1]
          $redis.zadd "kupsearch:#{key.downcase}", 1, json_data
        end
      end
    end

    def format_data(subject)
      {
        id: subject.id,
        name: subject.name,
        label: subject.label,
        type: subject.class.name
      }.to_json
    end

    def results_for(term, max = 5)
      return [] if term.blank?
      results = $redis.zrevrange "kupsearch:#{term.downcase}", 0, max-1
      results.map { |result| JSON.parse(result, symbolize_names: true) }
    end
  end
end