爲什麼在我的config/application.rb中「require'rails/all'」沒有安裝/需要？

Question

這只是一個奇怪的刺激，但爲什麼我的應用程序不在config/application.rb或其他任何地方包含預期的行？

require 'rails/all' 

這個應用程序是在2014年初使用Rails Composer生成的，如果這樣做有所幫助的話。另外，它是Rails 4.2.1。

這個問題的出現只是因爲我正在研究Configuring Rails Applications和The Rails Initialization Process指南，因爲我需要修改我的初始化過程。都聲明config/application.rb文件預計包含該行，但我的不。而且，是的，該應用在本地和Heroku上運行良好，所以...爲什麼？

我的文件是：

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 

Answer 1

你可以，如果適合您的花哨，但運行應用程序所需的鋼軌的部分都需要與這些線require 'rails/all'：

require "active_record/railtie" 
require "action_controller/railtie" 
require "action_mailer/railtie" 
require "sprockets/railtie" 

如果我是爲了猜測這種動機，可能是因爲你不一定需要或不需要應用程序中的所有rails部分，所以更好地明確地需要你想要的而不是所有的東西。在這種情況下，如果您是require 'rails/all'，那麼您最終將得到action_view,active_job和rails/test_unit以及上述內容。這些文件需要can be found in railties。