mirror of
https://github.com/rails/rails.git
synced 2022-11-09 12:12:34 -05:00
628 lines
21 KiB
Ruby
628 lines
21 KiB
Ruby
require 'rails/railtie'
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require 'active_support/core_ext/module/delegation'
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require 'pathname'
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require 'rbconfig'
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require 'rails/engine/railties'
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module Rails
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# <tt>Rails::Engine</tt> allows you to wrap a specific Rails application or subset of
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# functionality and share it with other applications. Since Rails 3.0, every
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# <tt>Rails::Application</tt> is just an engine, which allows for simple
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# feature and application sharing.
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#
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# Any <tt>Rails::Engine</tt> is also a <tt>Rails::Railtie</tt>, so the same
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# methods (like <tt>rake_tasks</tt> and +generators+) and configuration
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# options that are available in railties can also be used in engines.
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#
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# == Creating an Engine
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#
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# In Rails versions prior to 3.0, your gems automatically behaved as engines, however,
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# this coupled Rails to Rubygems. Since Rails 3.0, if you want a gem to automatically
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# behave as an engine, you have to specify an +Engine+ for it somewhere inside
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# your plugin's +lib+ folder (similar to how we specify a +Railtie+):
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#
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# # lib/my_engine.rb
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# module MyEngine
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# class Engine < Rails::Engine
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# end
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# end
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#
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# Then ensure that this file is loaded at the top of your <tt>config/application.rb</tt>
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# (or in your +Gemfile+) and it will automatically load models, controllers and helpers
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# inside +app+, load routes at <tt>config/routes.rb</tt>, load locales at
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# <tt>config/locales/*</tt>, and load tasks at <tt>lib/tasks/*</tt>.
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#
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# == Configuration
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#
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# Besides the +Railtie+ configuration which is shared across the application, in a
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# <tt>Rails::Engine</tt> you can access <tt>autoload_paths</tt>, <tt>eager_load_paths</tt>
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# and <tt>autoload_once_paths</tt>, which, differently from a <tt>Railtie</tt>, are scoped to
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# the current engine.
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#
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# Example:
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#
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# class MyEngine < Rails::Engine
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# # Add a load path for this specific Engine
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# config.autoload_paths << File.expand_path("../lib/some/path", __FILE__)
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#
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# initializer "my_engine.add_middleware" do |app|
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# app.middleware.use MyEngine::Middleware
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# end
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# end
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#
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# == Generators
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#
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# You can set up generators for engines with <tt>config.generators</tt> method:
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#
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# class MyEngine < Rails::Engine
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# config.generators do |g|
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# g.orm :active_record
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# g.template_engine :erb
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# g.test_framework :test_unit
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# end
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# end
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#
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# You can also set generators for an application by using <tt>config.app_generators</tt>:
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#
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# class MyEngine < Rails::Engine
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# # note that you can also pass block to app_generators in the same way you
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# # can pass it to generators method
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# config.app_generators.orm :datamapper
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# end
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#
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# == Paths
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#
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# Since Rails 3.0, applications and engines have more flexible path configuration (as
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# opposed to the previous hardcoded path configuration). This means that you are not
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# required to place your controllers at <tt>app/controllers</tt>, but in any place
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# which you find convenient.
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#
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# For example, let's suppose you want to place your controllers in <tt>lib/controllers</tt>.
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# You can set that as an option:
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#
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# class MyEngine < Rails::Engine
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# paths["app/controllers"] = "lib/controllers"
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# end
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#
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# You can also have your controllers loaded from both <tt>app/controllers</tt> and
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# <tt>lib/controllers</tt>:
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#
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# class MyEngine < Rails::Engine
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# paths["app/controllers"] << "lib/controllers"
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# end
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#
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# The available paths in an engine are:
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#
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# class MyEngine < Rails::Engine
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# paths["app"] # => ["app"]
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# paths["app/controllers"] # => ["app/controllers"]
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# paths["app/helpers"] # => ["app/helpers"]
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# paths["app/models"] # => ["app/models"]
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# paths["app/views"] # => ["app/views"]
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# paths["lib"] # => ["lib"]
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# paths["lib/tasks"] # => ["lib/tasks"]
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# paths["config"] # => ["config"]
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# paths["config/initializers"] # => ["config/initializers"]
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# paths["config/locales"] # => ["config/locales"]
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# paths["config/routes"] # => ["config/routes.rb"]
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# end
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#
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# The <tt>Application</tt> class adds a couple more paths to this set. And as in your
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# <tt>Application</tt>, all folders under +app+ are automatically added to the load path.
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# If you have an <tt>app/observers</tt> folder for example, it will be added by default.
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#
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# == Endpoint
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#
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# An engine can be also a rack application. It can be useful if you have a rack application that
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# you would like to wrap with +Engine+ and provide some of the +Engine+'s features.
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#
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# To do that, use the +endpoint+ method:
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#
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# module MyEngine
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# class Engine < Rails::Engine
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# endpoint MyRackApplication
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# end
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# end
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#
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# Now you can mount your engine in application's routes just like that:
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#
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# MyRailsApp::Application.routes.draw do
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# mount MyEngine::Engine => "/engine"
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# end
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#
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# == Middleware stack
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#
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# As an engine can now be a rack endpoint, it can also have a middleware
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# stack. The usage is exactly the same as in <tt>Application</tt>:
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#
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# module MyEngine
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# class Engine < Rails::Engine
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# middleware.use SomeMiddleware
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# end
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# end
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#
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# == Routes
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#
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# If you don't specify an endpoint, routes will be used as the default
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# endpoint. You can use them just like you use an application's routes:
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#
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# # ENGINE/config/routes.rb
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# MyEngine::Engine.routes.draw do
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# match "/" => "posts#index"
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# end
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#
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# == Mount priority
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#
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# Note that now there can be more than one router in your application, and it's better to avoid
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# passing requests through many routers. Consider this situation:
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#
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# MyRailsApp::Application.routes.draw do
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# mount MyEngine::Engine => "/blog"
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# match "/blog/omg" => "main#omg"
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# end
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#
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# +MyEngine+ is mounted at <tt>/blog</tt>, and <tt>/blog/omg</tt> points to application's
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# controller. In such a situation, requests to <tt>/blog/omg</tt> will go through +MyEngine+,
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# and if there is no such route in +Engine+'s routes, it will be dispatched to <tt>main#omg</tt>.
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# It's much better to swap that:
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#
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# MyRailsApp::Application.routes.draw do
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# match "/blog/omg" => "main#omg"
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# mount MyEngine::Engine => "/blog"
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# end
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#
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# Now, +Engine+ will get only requests that were not handled by +Application+.
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#
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# == Engine name
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#
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# There are some places where an Engine's name is used:
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#
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# * routes: when you mount an Engine with <tt>mount(MyEngine::Engine => '/my_engine')</tt>,
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# it's used as default :as option
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# * some of the rake tasks are based on engine name, e.g. <tt>my_engine:install:migrations</tt>,
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# <tt>my_engine:install:assets</tt>
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#
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# Engine name is set by default based on class name. For <tt>MyEngine::Engine</tt> it will be
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# <tt>my_engine_engine</tt>. You can change it manually using the <tt>engine_name</tt> method:
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#
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# module MyEngine
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# class Engine < Rails::Engine
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# engine_name "my_engine"
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# end
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# end
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#
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# == Isolated Engine
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#
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# Normally when you create controllers, helpers and models inside an engine, they are treated
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# as if they were created inside the application itself. This means that all helpers and
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# named routes from the application will be available to your engine's controllers as well.
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#
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# However, sometimes you want to isolate your engine from the application, especially if your engine
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# has its own router. To do that, you simply need to call +isolate_namespace+. This method requires
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# you to pass a module where all your controllers, helpers and models should be nested to:
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#
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# module MyEngine
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# class Engine < Rails::Engine
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# isolate_namespace MyEngine
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# end
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# end
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#
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# With such an engine, everything that is inside the +MyEngine+ module will be isolated from
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# the application.
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#
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# Consider such controller:
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#
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# module MyEngine
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# class FooController < ActionController::Base
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# end
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# end
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#
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# If an engine is marked as isolated, +FooController+ has access only to helpers from +Engine+ and
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# <tt>url_helpers</tt> from <tt>MyEngine::Engine.routes</tt>.
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#
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# The next thing that changes in isolated engines is the behavior of routes. Normally, when you namespace
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# your controllers, you also need to do namespace all your routes. With an isolated engine,
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# the namespace is applied by default, so you can ignore it in routes:
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#
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# MyEngine::Engine.routes.draw do
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# resources :articles
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# end
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#
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# The routes above will automatically point to <tt>MyEngine::ApplicationContoller</tt>. Furthermore, you don't
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# need to use longer url helpers like <tt>my_engine_articles_path</tt>. Instead, you should simply use
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# <tt>articles_path</tt> as you would do with your application.
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#
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# To make that behavior consistent with other parts of the framework, an isolated engine also has influence on
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# <tt>ActiveModel::Naming</tt>. When you use a namespaced model, like <tt>MyEngine::Article</tt>, it will normally
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# use the prefix "my_engine". In an isolated engine, the prefix will be omitted in url helpers and
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# form fields for convenience.
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#
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# polymorphic_url(MyEngine::Article.new) # => "articles_path"
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#
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# form_for(MyEngine::Article.new) do
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# text_field :title # => <input type="text" name="article[title]" id="article_title" />
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# end
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#
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# Additionally, an isolated engine will set its name according to namespace, so
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# MyEngine::Engine.engine_name will be "my_engine". It will also set MyEngine.table_name_prefix
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# to "my_engine_", changing the MyEngine::Article model to use the my_engine_article table.
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#
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# == Using Engine's routes outside Engine
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#
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# Since you can now mount an engine inside application's routes, you do not have direct access to +Engine+'s
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# <tt>url_helpers</tt> inside +Application+. When you mount an engine in an application's routes, a special helper is
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# created to allow you to do that. Consider such a scenario:
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#
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# # config/routes.rb
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# MyApplication::Application.routes.draw do
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# mount MyEngine::Engine => "/my_engine", :as => "my_engine"
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# match "/foo" => "foo#index"
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# end
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#
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# Now, you can use the <tt>my_engine</tt> helper inside your application:
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#
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# class FooController < ApplicationController
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# def index
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# my_engine.root_url #=> /my_engine/
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# end
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# end
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#
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# There is also a <tt>main_app</tt> helper that gives you access to application's routes inside Engine:
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#
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# module MyEngine
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# class BarController
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# def index
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# main_app.foo_path #=> /foo
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# end
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# end
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# end
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#
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# Note that the <tt>:as</tt> option given to mount takes the <tt>engine_name</tt> as default, so most of the time
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# you can simply omit it.
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#
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# Finally, if you want to generate a url to an engine's route using
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# <tt>polymorphic_url</tt>, you also need to pass the engine helper. Let's
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# say that you want to create a form pointing to one of the engine's routes.
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# All you need to do is pass the helper as the first element in array with
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# attributes for url:
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#
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# form_for([my_engine, @user])
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#
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# This code will use <tt>my_engine.user_path(@user)</tt> to generate the proper route.
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#
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# == Isolated engine's helpers
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#
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# Sometimes you may want to isolate engine, but use helpers that are defined for it.
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# If you want to share just a few specific helpers you can add them to application's
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# helpers in ApplicationController:
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#
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# class ApplicationController < ActionController::Base
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# helper MyEngine::SharedEngineHelper
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# end
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#
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# If you want to include all of the engine's helpers, you can use #helpers method on an engine's
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# instance:
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#
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# class ApplicationController < ActionController::Base
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# helper MyEngine::Engine.helpers
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# end
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#
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# It will include all of the helpers from engine's directory. Take into account that this does
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# not include helpers defined in controllers with helper_method or other similar solutions,
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# only helpers defined in the helpers directory will be included.
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#
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# == Migrations & seed data
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#
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# Engines can have their own migrations. The default path for migrations is exactly the same
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# as in application: <tt>db/migrate</tt>
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#
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# To use engine's migrations in application you can use rake task, which copies them to
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# application's dir:
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#
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# rake ENGINE_NAME:install:migrations
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#
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# Note that some of the migrations may be skipped if a migration with the same name already exists
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# in application. In such a situation you must decide whether to leave that migration or rename the
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# migration in the application and rerun copying migrations.
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#
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# If your engine has migrations, you may also want to prepare data for the database in
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# the <tt>seeds.rb</tt> file. You can load that data using the <tt>load_seed</tt> method, e.g.
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#
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# MyEngine::Engine.load_seed
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#
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class Engine < Railtie
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autoload :Configuration, "rails/engine/configuration"
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autoload :Railties, "rails/engine/railties"
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def load_generators(app=self)
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initialize_generators
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railties.all { |r| r.load_generators(app) }
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Rails::Generators.configure!(app.config.generators)
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super
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self
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end
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class << self
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attr_accessor :called_from, :isolated
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alias :isolated? :isolated
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alias :engine_name :railtie_name
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def inherited(base)
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unless base.abstract_railtie?
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base.called_from = begin
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# Remove the line number from backtraces making sure we don't leave anything behind
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call_stack = caller.map { |p| p.sub(/:\d+.*/, '') }
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File.dirname(call_stack.detect { |p| p !~ %r[railties[\w.-]*/lib/rails|rack[\w.-]*/lib/rack] })
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end
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end
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super
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end
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def endpoint(endpoint = nil)
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@endpoint ||= nil
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@endpoint = endpoint if endpoint
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@endpoint
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end
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def isolate_namespace(mod)
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engine_name(generate_railtie_name(mod))
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self.routes.default_scope = { :module => ActiveSupport::Inflector.underscore(mod.name) }
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self.isolated = true
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unless mod.respond_to?(:_railtie)
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name = engine_name
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_railtie = self
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mod.singleton_class.instance_eval do
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define_method(:_railtie) do
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_railtie
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end
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unless mod.respond_to?(:table_name_prefix)
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define_method(:table_name_prefix) do
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"#{name}_"
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end
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end
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end
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end
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end
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# Finds engine with given path
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def find(path)
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expanded_path = File.expand_path path.to_s
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Rails::Engine::Railties.engines.find { |engine|
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File.expand_path(engine.root.to_s) == expanded_path
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}
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end
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end
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delegate :middleware, :root, :paths, :to => :config
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delegate :engine_name, :isolated?, :to => "self.class"
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def load_tasks(app=self)
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railties.all { |r| r.load_tasks(app) }
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super
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paths["lib/tasks"].existent.sort.each { |ext| load(ext) }
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end
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def load_console(app=self)
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railties.all { |r| r.load_console(app) }
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super
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end
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def eager_load!
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railties.all(&:eager_load!)
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config.eager_load_paths.each do |load_path|
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matcher = /\A#{Regexp.escape(load_path)}\/(.*)\.rb\Z/
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Dir.glob("#{load_path}/**/*.rb").sort.each do |file|
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require_dependency file.sub(matcher, '\1')
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end
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end
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end
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def railties
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@railties ||= self.class::Railties.new(config)
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end
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def helpers
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@helpers ||= begin
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helpers = Module.new
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helpers_paths = if config.respond_to?(:helpers_paths)
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config.helpers_paths
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else
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paths["app/helpers"].existent
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end
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all = ActionController::Base.all_helpers_from_path(helpers_paths)
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ActionController::Base.modules_for_helpers(all).each do |mod|
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helpers.send(:include, mod)
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end
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helpers
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end
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end
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def app
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@app ||= begin
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config.middleware = config.middleware.merge_into(default_middleware_stack)
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config.middleware.build(endpoint)
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end
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end
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def endpoint
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self.class.endpoint || routes
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end
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def call(env)
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app.call(env.merge!(env_config))
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end
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def env_config
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@env_config ||= {
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'action_dispatch.routes' => routes
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}
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end
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def routes
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@routes ||= ActionDispatch::Routing::RouteSet.new
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@routes.append(&Proc.new) if block_given?
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@routes
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end
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def initializers
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initializers = []
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railties.all { |r| initializers += r.initializers }
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initializers += super
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initializers
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end
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def config
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@config ||= Engine::Configuration.new(find_root_with_flag("lib"))
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end
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# Load data from db/seeds.rb file. It can be used in to load engines'
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# seeds, e.g.:
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#
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# Blog::Engine.load_seed
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def load_seed
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seed_file = paths["db/seeds"].existent.first
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load(seed_file) if File.exist?(seed_file)
|
|
end
|
|
|
|
# Add configured load paths to ruby load paths and remove duplicates.
|
|
initializer :set_load_path, :before => :bootstrap_hook do
|
|
_all_load_paths.reverse_each do |path|
|
|
$LOAD_PATH.unshift(path) if File.directory?(path)
|
|
end
|
|
$LOAD_PATH.uniq!
|
|
end
|
|
|
|
# Set the paths from which Rails will automatically load source files,
|
|
# and the load_once paths.
|
|
#
|
|
# This needs to be an initializer, since it needs to run once
|
|
# per engine and get the engine as a block parameter
|
|
initializer :set_autoload_paths, :before => :bootstrap_hook do |app|
|
|
ActiveSupport::Dependencies.autoload_paths.unshift(*_all_autoload_paths)
|
|
ActiveSupport::Dependencies.autoload_once_paths.unshift(*_all_autoload_once_paths)
|
|
|
|
# Freeze so future modifications will fail rather than do nothing mysteriously
|
|
config.autoload_paths.freeze
|
|
config.eager_load_paths.freeze
|
|
config.autoload_once_paths.freeze
|
|
end
|
|
|
|
initializer :add_routing_paths do |app|
|
|
paths = self.paths["config/routes"].existent
|
|
|
|
if routes? || paths.any?
|
|
app.routes_reloader.paths.unshift(*paths)
|
|
app.routes_reloader.route_sets << routes
|
|
end
|
|
end
|
|
|
|
# I18n load paths are a special case since the ones added
|
|
# later have higher priority.
|
|
initializer :add_locales do
|
|
config.i18n.railties_load_path.concat(paths["config/locales"].existent)
|
|
end
|
|
|
|
initializer :add_view_paths do
|
|
views = paths["app/views"].existent
|
|
unless views.empty?
|
|
ActiveSupport.on_load(:action_controller){ prepend_view_path(views) }
|
|
ActiveSupport.on_load(:action_mailer){ prepend_view_path(views) }
|
|
end
|
|
end
|
|
|
|
initializer :load_environment_config, :before => :load_environment_hook do
|
|
environment = paths["config/environments"].existent.first
|
|
require environment if environment
|
|
end
|
|
|
|
initializer :append_assets_path do |app|
|
|
app.config.assets.paths.unshift(*paths["vendor/assets"].existent_directories)
|
|
app.config.assets.paths.unshift(*paths["lib/assets"].existent_directories)
|
|
app.config.assets.paths.unshift(*paths["app/assets"].existent_directories)
|
|
end
|
|
|
|
initializer :prepend_helpers_path do |app|
|
|
if !isolated? || (app == self)
|
|
app.config.helpers_paths.unshift(*paths["app/helpers"].existent)
|
|
end
|
|
end
|
|
|
|
initializer :load_config_initializers do
|
|
config.paths["config/initializers"].existent.sort.each do |initializer|
|
|
load(initializer)
|
|
end
|
|
end
|
|
|
|
initializer :engines_blank_point do
|
|
# We need this initializer so all extra initializers added in engines are
|
|
# consistently executed after all the initializers above across all engines.
|
|
end
|
|
|
|
rake_tasks do
|
|
next if self.is_a?(Rails::Application)
|
|
next unless has_migrations?
|
|
|
|
namespace railtie_name do
|
|
namespace :install do
|
|
desc "Copy migrations from #{railtie_name} to application"
|
|
task :migrations do
|
|
ENV["FROM"] = railtie_name
|
|
Rake::Task["railties:install:migrations"].invoke
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
protected
|
|
|
|
def initialize_generators
|
|
require "rails/generators"
|
|
end
|
|
|
|
def routes?
|
|
defined?(@routes)
|
|
end
|
|
|
|
def has_migrations?
|
|
paths["db/migrate"].existent.any?
|
|
end
|
|
|
|
def find_root_with_flag(flag, default=nil)
|
|
root_path = self.class.called_from
|
|
|
|
while root_path && File.directory?(root_path) && !File.exist?("#{root_path}/#{flag}")
|
|
parent = File.dirname(root_path)
|
|
root_path = parent != root_path && parent
|
|
end
|
|
|
|
root = File.exist?("#{root_path}/#{flag}") ? root_path : default
|
|
raise "Could not find root path for #{self}" unless root
|
|
|
|
RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ?
|
|
Pathname.new(root).expand_path : Pathname.new(root).realpath
|
|
end
|
|
|
|
def default_middleware_stack
|
|
ActionDispatch::MiddlewareStack.new
|
|
end
|
|
|
|
def _all_autoload_once_paths
|
|
config.autoload_once_paths
|
|
end
|
|
|
|
def _all_autoload_paths
|
|
@_all_autoload_paths ||= (config.autoload_paths + config.eager_load_paths + config.autoload_once_paths).uniq
|
|
end
|
|
|
|
def _all_load_paths
|
|
@_all_load_paths ||= (config.paths.load_paths + _all_autoload_paths).uniq
|
|
end
|
|
end
|
|
end
|