Class: Rails::Application

Inherits:
Engine show all
Defined in:
lib/rails/application.rb,
lib/rails/application/finisher.rb,
lib/rails/application/railties.rb,
lib/rails/application/bootstrap.rb,
lib/rails/application/configurable.rb,
lib/rails/application/configuration.rb

Overview

In Rails 3.0, a Rails::Application object was introduced which is nothing more than an Engine but with the responsibility of coordinating the whole boot process.

Initialization

Rails::Application is responsible for executing all railties, engines and plugin initializers. Besides, it also executed some bootstrap initializers (check Rails::Application::Bootstrap) and finishing initializers, after all the others are executed (check Rails::Application::Finisher).

Configuration

Besides providing the same configuration as Rails::Engine and Rails::Railtie, the application object has several specific configurations, for example “allow_concurrency”, “cache_classes”, “consider_all_requests_local”, “filter_parameters”, “logger”, “reload_plugins” and so forth.

Check Rails::Application::Configuration to see them all.

Routes

The application object is also responsible for holding the routes and reloading routes whenever the files change in development.

Middlewares

The Application is also responsible for building the middleware stack.

Defined Under Namespace

Modules: Bootstrap, Configurable, Finisher Classes: Configuration, Railties

Constant Summary

Constants inherited from Railtie

Railtie::ABSTRACT_RAILTIES

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Engine

find_root_with_flag

Methods inherited from Railtie

abstract_railtie?, console, generators, log_subscriber, railtie_name, rake_tasks, subclasses

Methods included from Initializable

included, #run_initializers

Class Method Details

.configure(&block) ⇒ Object 



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# File 'lib/rails/application.rb', line 46

def configure(&block)
  class_eval(&block)
end

.inherited(base) ⇒ Object 



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# File 'lib/rails/application.rb', line 62

def inherited(base)
  raise "You cannot have more than one Rails::Application" if Rails.application
  super
  Rails.application = base.instance
  Rails.application.add_lib_to_load_path!
  ActiveSupport.run_load_hooks(:before_configuration, base.instance)
end

.instance ⇒ Object 



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# File 'lib/rails/application.rb', line 50

def instance
  if self == Rails::Application
    if Rails.application
      ActiveSupport::Deprecation.warn "Calling a method in Rails::Application is deprecated, " <<
        "please call it directly in your application constant #{Rails.application.class.name}.", caller
    end
    Rails.application
  else
    @@instance ||= new
  end
end

.respond_to?(*args) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rails/application.rb', line 70

def respond_to?(*args)
  super || instance.respond_to?(*args)
end

Instance Method Details

#add_lib_to_load_path! ⇒ Object

This method is called just after an application inherits from Rails::Application, allowing the developer to load classes in lib and use them during application configuration.

class MyApplication < Rails::Application
  require "my_backend" # in lib/my_backend
  config.i18n.backend = MyBackend
end

Notice this method takes into consideration the default root path. So if you are changing config.root inside your application definition or having a custom Rails application, you will need to add lib to $LOAD_PATH on your own in case you need to load files in lib/ during the application configuration as well.



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# File 'lib/rails/application.rb', line 96

def add_lib_to_load_path! #:nodoc:
  path = config.root.join('lib').to_s
  $LOAD_PATH.unshift(path) if File.exists?(path)
end

#app ⇒ Object Also known as: build_middleware_stack 



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# File 'lib/rails/application.rb', line 159

def app
  @app ||= begin
    config.middleware = config.middleware.merge_into(default_middleware_stack)
    config.middleware.build(routes)
  end
end

#call(env) ⇒ Object 



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# File 'lib/rails/application.rb', line 167

def call(env)
  app.call(env.reverse_merge!(env_defaults))
end

#eager_load! ⇒ Object

:nodoc:



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# File 'lib/rails/application.rb', line 106

def eager_load! #:nodoc:
  railties.all(&:eager_load!)
  super
end

#env_defaults ⇒ Object 



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# File 'lib/rails/application.rb', line 171

def env_defaults
  @env_defaults ||= {
    "action_dispatch.parameter_filter" => config.filter_parameters,
    "action_dispatch.secret_token" => config.secret_token,
    "action_dispatch.show_exceptions" => config.action_dispatch.show_exceptions
  }
end

#initialize! ⇒ Object 



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# File 'lib/rails/application.rb', line 133

def initialize!
  run_initializers(self)
  self
end

#initializers ⇒ Object 



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# File 'lib/rails/application.rb', line 179

def initializers
  initializers = Bootstrap.initializers_for(self)
  railties.all { |r| initializers += r.initializers }
  initializers += super
  initializers += Finisher.initializers_for(self)
  initializers
end

#load_console(sandbox = false) ⇒ Object 



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# File 'lib/rails/application.rb', line 152

def load_console(sandbox=false)
  initialize_console(sandbox)
  railties.all { |r| r.load_console }
  super()
  self
end

#load_generators ⇒ Object 



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# File 'lib/rails/application.rb', line 145

def load_generators
  initialize_generators
  railties.all { |r| r.load_generators }
  super
  self
end

#load_tasks ⇒ Object 



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# File 'lib/rails/application.rb', line 138

def load_tasks
  initialize_tasks
  railties.all { |r| r.load_tasks }
  super
  self
end

#railties ⇒ Object 



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# File 'lib/rails/application.rb', line 115

def railties
  @railties ||= Railties.new(config)
end

#reload_routes! ⇒ Object 



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# File 'lib/rails/application.rb', line 123

def reload_routes!
  _routes = self.routes
  _routes.disable_clear_and_finalize = true
  _routes.clear!
  routes_reloader.paths.each { |path| load(path) }
  ActiveSupport.on_load(:action_controller) { _routes.finalize! }
ensure
  _routes.disable_clear_and_finalize = false
end

#require_environment! ⇒ Object

:nodoc:



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# File 'lib/rails/application.rb', line 101

def require_environment! #:nodoc:
  environment = paths.config.environment.to_a.first
  require environment if environment
end

#routes ⇒ Object 



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# File 'lib/rails/application.rb', line 111

def routes
  @routes ||= ActionDispatch::Routing::RouteSet.new
end

#routes_reloader ⇒ Object 



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# File 'lib/rails/application.rb', line 119

def routes_reloader
  @routes_reloader ||= ActiveSupport::FileUpdateChecker.new([]){ reload_routes! }
end