为什么在我的config / application.rb文件中没有安装/要求“ require'rails / all'”？

这只是一个令人好奇的刺激因素，但是为什么我的应用程序未在config / application.rb或其他任何地方包含预期的行？

require 'rails/all' 

如果有帮助，此应用是在2014年初使用Rails Composer生成的。此外，它是Rails 4.2.1。

之所以出现此问题，是因为我正在研究《配置Rails应用程序》和《 Rails初始化过程》指南，因为我需要修改自己的初始化过程。两者都指出config / application.rb文件应包含该行，而我的文件不包含。而且，是的，该应用程序可以在本地和Heroku上正常运行，所以...为什么呢？

我的档案是：

require File.expand_path('../boot', __FILE__)

# Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(:default, Rails.env)

module Theappname
  class Application < Rails::Application

    config.generators do |g|

      # Enable Chrome Source Maps so CSS and JS can be debugged
      #g.sass_options = { :debug_info => true }

      # don't generate RSpec tests for views and helpers
      g.test_framework :rspec, fixture: true
      g.fixture_replacement :factory_girl, dir: 'spec/factories'

      g.view_specs false
      g.helper_specs false
    end

    # Rails 4 should include all helpers for controllers and views
    config.action_controller.include_all_helpers = true  

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    #config.time_zone = 'Eastern Time (US & Canada)'
    config.time_zone = 'UTC'   # Don't use local time or you won't notice time issues.

    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
    # config.i18n.default_locale = :de

    # Do not check for unavailable locales
    I18n.enforce_available_locales = false

    # not needed at 4.0
    config.assets.initialize_on_precompile = false

    # Load files in lib
    config.autoload_paths += %W(#{config.root}/lib)

    # Extend Rails classes in lib/core_ext/<classname>.rb...  See above?
    #config.autoload_paths += Dir[File.join(Rails.root, "lib", "core_ext", "*.rb")].each {|l| require l }

    # 20150711 Default Date formats
    #default_date_formats = { :default => '%d.%m.%Y' }
    default_date_formats = { :default => '%Y.%m.%d' }
    Time::DATE_FORMATS.merge!(default_date_formats)
    Date::DATE_FORMATS.merge!(default_date_formats)

    # 20150808 Adding Delayed_Job queueing for daily_report and such
    config.active_job.queue_adapter = :delayed_job

  end
end