Custom number converter example (fuzzily)

fuzzily_converter_example.rb

class Product < ApplicationRecord
  fuzzily_searchable :search_name, class_name: "ProductTrigram"
  
  def search_name
    term = [name, name_origin, *search_terms.try(:split, ",")].join(" ")
    term = FuzzilyStringConverter.convert_in_string(term)
    term.split(" ").uniq.join(" ")
  end

  def saved_change_to_search_name?
    saved_change_to_name? || saved_change_to_name_origin? || saved_change_to_search_terms?
  end
end

class SearchController < ApplicationController
  def index
    query = FuzzilyStringConverter.convert_in_string(params[:query])
    ids = Product.find_by_fuzzy_search_name(query, limit: 50).map(&:id)
    # …
  end
end

class FuzzilyStringConverter
  def self.convert_in_string input
    deromanize(input).gsub(/\d/) {|num| utf8_mapping[num.to_i] }
  end

  def self.deromanize input
    input.gsub(/\w+/) {|el| roman_to_latin_mapping[el.upcase] || el }
  end

  def self.utf8_mapping
    {
      0 => "aaa",
      1 => "bbb",
      2 => "ccc",
      3 => "ddd",
      4 => "eee",
      5 => "fff",
      6 => "ggg",
      7 => "hhh",
      8 => "iii",
      9 => "jjj",
    }
  end

  def self.roman_to_latin_mapping
    {
      "I" => 1,
      "II" => 2,
      "III" => 3,
      "IV" => 4,
      "V" => 5,
      "VI" => 6,
      "VII" => 7,
      "VIII" => 8,
      "IX" => 9,
      "X" => 10,
      "XI" => 11,
      "XII" => 12,
      "XIII" => 13,
      "XIV" => 14,
      "XV" => 15,
      "XVI" => 16,
      "XVII" => 17,
      "XVIII" => 18,
      "XIX" => 19,
      "XX" => 20,
      "XXI" => 21,
      "XXII" => 22,
      "XXIII" => 23,
      "XXIV" => 24,
      "XXV" => 25,
      "XXVI" => 26,
      "XXVII" => 27,
      "XXVIII" => 28,
      "XXIX" => 29,
      "XXX" => 30,
      "XXXI" => 31,
      "XXXII" => 32,
      "XXXIII" => 33,
      "XXXIV" => 34,
      "XXXV" => 35,
      "XXXVI" => 36,
      "XXXVII" => 37,
      "XXXVIII" => 38,
      "XXXIX" => 39,
      "XL" => 40,
      "XLI" => 41,
      "XLII" => 42,
      "XLIII" => 43,
      "XLIV" => 44,
      "XLV" => 45,
      "XLVI" => 46,
      "XLVII" => 47,
      "XLVIII" => 48,
      "XLIX" => 49,
      "L" => 50,
      "LI" => 51,
      "LII" => 52,
      "LIII" => 53,
      "LIV" => 54,
      "LV" => 55,
      "LVI" => 56,
      "LVII" => 57,
      "LVIII" => 58,
      "LIX" => 59,
      "LX" => 60,
      "LXI" => 61,
      "LXII" => 62,
      "LXIII" => 63,
      "LXIV" => 64,
      "LXV" => 65,
      "LXVI" => 66,
      "LXVII" => 67,
      "LXVIII" => 68,
      "LXIX" => 69,
      "LXX" => 70,
      "LXXI" => 71,
      "LXXII" => 72,
      "LXXIII" => 73,
      "LXXIV" => 74,
      "LXXV" => 75,
      "LXXVI" => 76,
      "LXXVII" => 77,
      "LXXVIII" => 78,
      "LXXIX" => 79,
      "LXXX" => 80,
      "LXXXI" => 81,
      "LXXXII" => 82,
      "LXXXIII" => 83,
      "LXXXIV" => 84,
      "LXXXV" => 85,
      "LXXXVI" => 86,
      "LXXXVII" => 87,
      "LXXXVIII" => 88,
      "LXXXIX" => 89,
      "XC" => 90,
      "XCI" => 91,
      "XCII" => 92,
      "XCIII" => 93,
      "XCIV" => 94,
      "XCV" => 95,
      "XCVI" => 96,
      "XCVII" => 97,
      "XCVIII" => 98,
      "XCIX" => 99,
      "C" => 100,
    }
  end
end