Друзья, у кого-то может возникнуть вопрос, зачем в Ruby и особенно в Rails стали активно использовать загрузчик Zeitwerk? Ответ простой, вот пример из одной моей библиотеки. Было:

require 'rating_chgk_v2/version'
require 'rating_chgk_v2/json_handler'
require 'rating_chgk_v2/connection'
require 'rating_chgk_v2/request'
require 'rating_chgk_v2/error'

require 'rating_chgk_v2/utils/string_utils'

require 'rating_chgk_v2/concerns/paginated'

require 'rating_chgk_v2/endpoints/base_endpoint'
require 'rating_chgk_v2/endpoints/players_endpoint'
require 'rating_chgk_v2/endpoints/countries_endpoint'
require 'rating_chgk_v2/endpoints/regions_endpoint'
require 'rating_chgk_v2/endpoints/authentication_token_endpoint'
require 'rating_chgk_v2/endpoints/seasons_endpoint'
require 'rating_chgk_v2/endpoints/releases_endpoint'
require 'rating_chgk_v2/endpoints/teams_endpoint'
require 'rating_chgk_v2/endpoints/tournament_flags_endpoint'
require 'rating_chgk_v2/endpoints/tournament_synch_appeals_endpoint'
require 'rating_chgk_v2/endpoints/tournament_synch_controversials_endpoint'
require 'rating_chgk_v2/endpoints/tournament_synch_requests_endpoint'
require 'rating_chgk_v2/endpoints/tournament_types_endpoint'

require 'rating_chgk_v2/models/base_model'
require 'rating_chgk_v2/models/player_model'
require 'rating_chgk_v2/models/player_season_model'
require 'rating_chgk_v2/models/player_tournament_model'
require 'rating_chgk_v2/models/country_model'
require 'rating_chgk_v2/models/region_model'
require 'rating_chgk_v2/models/authentication_token_model'
require 'rating_chgk_v2/models/season_model'
require 'rating_chgk_v2/models/release_model'
require 'rating_chgk_v2/models/team_model'
require 'rating_chgk_v2/models/team_tournament_model'
require 'rating_chgk_v2/models/tournament_flag_model'
require 'rating_chgk_v2/models/tournament_synch_appeal_model'
require 'rating_chgk_v2/models/tournament_synch_controversial_model'
require 'rating_chgk_v2/models/tournament_synch_request_model'
require 'rating_chgk_v2/models/tournament_type_model'

require 'rating_chgk_v2/collections/base_collection'
require 'rating_chgk_v2/collections/players_collection'
require 'rating_chgk_v2/collections/player_seasons_collection'
require 'rating_chgk_v2/collections/player_tournaments_collection'
require 'rating_chgk_v2/collections/countries_collection'
require 'rating_chgk_v2/collections/regions_collection'
require 'rating_chgk_v2/collections/seasons_collection'
require 'rating_chgk_v2/collections/releases_collection'
require 'rating_chgk_v2/collections/teams_collection'
require 'rating_chgk_v2/collections/team_tournaments_collection'
require 'rating_chgk_v2/collections/tournament_flags_collection'
require 'rating_chgk_v2/collections/tournament_types_collection'

require 'rating_chgk_v2/client'

Стало:

require "zeitwerk"
loader = Zeitwerk::Loader.for_gem
loader.setup