Ruby's IoC with dry-container and dry-auto_inject

bootstrap.rb

require 'dry-contaienr'
require 'dry-auto_inject'

# Singleton style container
class Container
  extend Dry::Container::Mixin

  namespace :repositories do
    register(:games) { GameRepository.new }
    register(:players) { PlayerRepository.new }
    # ...
  end

  namespace :services do
    register(:game) { GameService.new }
    # ...
  end
end

Injectable = Dry::AutoInject(Container)

config.ru

require_relative './app/controllers/game_controller.rb'

app = lambda do |env|
  # ...
  controller = GameController.new(params: { id: '...' })
  ret = controller.start
  # ...
end

run app

game_controller.rb

require_relative '../../bootstrap.rb'

# Application Layer - Game-related actions
class GameController < BaseController
  include Injectable[
    'repositories.games',
    game_service: 'services.game'
  ]
  
  # ..
  def start
    @game = games.find(params[:id])
    game_service.start(@game)
    games.save(@game)
    @game
  rescue GameService::NotReadyError => e
    # ...
  end
end

game_service.rb

require_relative '../../bootstrap.rb'

# Domain Layer - Game-related business logic
class GameService < BaseService
  class NotReadyError < StandardError; end
  
  include Injectable[
    'repositories.players'
  ]
  
  ALLOWED_PLAYERS = (3..5).freeze
  
  def start(game)
    in_game_players = players.in_game(id: game.id)
    raise NotReadyError unless ALLOWED_PLAYERS.cover?(in_game_players.size)
    
    game.start
  end
end