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[Guides] Rewrite Rails application section

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This commit is contained in:
Oscar Del Ben 2012-05-24 08:43:29 -07:00
parent 27874a8e43
commit cd6aa9f095
1 changed files with 11 additions and 18 deletions
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29
guides/source/initialization.textile
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@ -603,27 +603,20 @@ end
h4. +railties/lib/rails/application.rb+ h4. +railties/lib/rails/application.rb+
The next file required by +railties/lib/rails.rb+ is +application.rb+. This file defines the +Rails::Application+ constant which the application's class defined in +config/application.rb+ in a standard Rails application depends on. Before the +Rails::Application+ class is defined however, there's some other files that get required first. The next file required by +railties/lib/rails.rb+ is +application.rb+.
This file defines the +Rails::Application+ constant which the
application's class defined in +config/application.rb+ in a standard
Rails application depends on.
The first of these is +active_support/core_ext/hash/reverse_merge+ which can be "read about in the Active Support Core Extensions guide":active_support_core_extensions.html#merging under the "Merging" section. Before the +Rails::Application+ class is
defined however, +rails/engine+ is also loaded, which is responsible for
handling the behavior and definitions of Rails engines.
h4. +active_support/file_update_checker.rb+ TIP: You can read more about engines in the "Getting Started with Engines":engines.html
guide.
The +ActiveSupport::FileUpdateChecker+ class defined within this file is responsible for checking if a file has been updated since it was last checked. This is used for monitoring the routes file for changes during development environment runs. Among other things, Rails Engine is also responsible for loading the
Railtie class.
h4. +railties/lib/rails/plugin.rb+
This file defines +Rails::Plugin+ which inherits from +Rails::Engine+. Unlike +Rails::Engine+ and +Rails::Railtie+ however, this class is not designed to be inherited from. Instead, this is used simply for loading plugins from within an application and an engine.
This file begins by requiring +rails/engine.rb+
h4. +railties/lib/rails/engine.rb+
The +rails/engine.rb+ file defines the +Rails::Engine+ class which inherits from +Rails::Railtie+. The +Rails::Engine+ class defines much of the functionality found within a standard application class such as the +routes+ and +config+ methods.
The "API documentation":http://api.rubyonrails.org/classes/Rails/Engine.html for +Rails::Engine+ explains the function of this class pretty well.
This file's first line requires +rails/railtie.rb+.
h4. +railties/lib/rails/railtie.rb+ h4. +railties/lib/rails/railtie.rb+