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Diffstat (limited to 'actionpack/lib/action_dispatch/routing/url_for.rb')
| -rw-r--r-- | actionpack/lib/action_dispatch/routing/url_for.rb | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb new file mode 100644 index 0000000000..eb554ec383 --- /dev/null +++ b/actionpack/lib/action_dispatch/routing/url_for.rb @@ -0,0 +1,189 @@ +module ActionDispatch + module Routing + # In <tt>config/routes.rb</tt> you define URL-to-controller mappings, but the reverse + # is also possible: an URL can be generated from one of your routing definitions. + # URL generation functionality is centralized in this module. + # + # See ActionDispatch::Routing for general information about routing and routes.rb. + # + # <b>Tip:</b> If you need to generate URLs from your models or some other place, + # then ActionController::UrlFor is what you're looking for. Read on for + # an introduction. In general, this module should not be included on its own, + # as it is usually included by url_helpers (as in Rails.application.routes.url_helpers). + # + # == URL generation from parameters + # + # As you may know, some functions, such as ActionController::Base#url_for + # and ActionView::Helpers::UrlHelper#link_to, can generate URLs given a set + # of parameters. For example, you've probably had the chance to write code + # like this in one of your views: + # + # <%= link_to('Click here', controller: 'users', + # action: 'new', message: 'Welcome!') %> + # # => <a href="/users/new?message=Welcome%21">Click here</a> + # + # link_to, and all other functions that require URL generation functionality, + # actually use ActionController::UrlFor under the hood. And in particular, + # they use the ActionController::UrlFor#url_for method. One can generate + # the same path as the above example by using the following code: + # + # include UrlFor + # url_for(controller: 'users', + # action: 'new', + # message: 'Welcome!', + # only_path: true) + # # => "/users/new?message=Welcome%21" + # + # Notice the <tt>only_path: true</tt> part. This is because UrlFor has no + # information about the website hostname that your Rails app is serving. So if you + # want to include the hostname as well, then you must also pass the <tt>:host</tt> + # argument: + # + # include UrlFor + # url_for(controller: 'users', + # action: 'new', + # message: 'Welcome!', + # host: 'www.example.com') + # # => "http://www.example.com/users/new?message=Welcome%21" + # + # By default, all controllers and views have access to a special version of url_for, + # that already knows what the current hostname is. So if you use url_for in your + # controllers or your views, then you don't need to explicitly pass the <tt>:host</tt> + # argument. + # + # For convenience reasons, mailers provide a shortcut for ActionController::UrlFor#url_for. + # So within mailers, you only have to type 'url_for' instead of 'ActionController::UrlFor#url_for' + # in full. However, mailers don't have hostname information, and that's why you'll still + # have to specify the <tt>:host</tt> argument when generating URLs in mailers. + # + # + # == URL generation for named routes + # + # UrlFor also allows one to access methods that have been auto-generated from + # named routes. For example, suppose that you have a 'users' resource in your + # <tt>config/routes.rb</tt>: + # + # resources :users + # + # This generates, among other things, the method <tt>users_path</tt>. By default, + # this method is accessible from your controllers, views and mailers. If you need + # to access this auto-generated method from other places (such as a model), then + # you can do that by including Rails.application.routes.url_helpers in your class: + # + # class User < ActiveRecord::Base + # include Rails.application.routes.url_helpers + # + # def base_uri + # user_path(self) + # end + # end + # + # User.find(1).base_uri # => "/users/1" + # + module UrlFor + extend ActiveSupport::Concern + include PolymorphicRoutes + + included do + unless method_defined?(:default_url_options) + # Including in a class uses an inheritable hash. Modules get a plain hash. + if respond_to?(:class_attribute) + class_attribute :default_url_options + else + mattr_writer :default_url_options + end + + self.default_url_options = {} + end + + include(*_url_for_modules) if respond_to?(:_url_for_modules) + end + + def initialize(*) + @_routes = nil + super + end + + # Hook overridden in controller to add request information + # with `default_url_options`. Application logic should not + # go into url_options. + def url_options + default_url_options + end + + # Generate a url based on the options provided, default_url_options and the + # routes defined in routes.rb. The following options are supported: + # + # * <tt>:only_path</tt> - If true, the relative url is returned. Defaults to +false+. + # * <tt>:protocol</tt> - The protocol to connect to. Defaults to 'http'. + # * <tt>:host</tt> - Specifies the host the link should be targeted at. + # If <tt>:only_path</tt> is false, this option must be + # provided either explicitly, or via +default_url_options+. + # * <tt>:subdomain</tt> - Specifies the subdomain of the link, using the +tld_length+ + # to split the subdomain from the host. + # If false, removes all subdomains from the host part of the link. + # * <tt>:domain</tt> - Specifies the domain of the link, using the +tld_length+ + # to split the domain from the host. + # * <tt>:tld_length</tt> - Number of labels the TLD id composed of, only used if + # <tt>:subdomain</tt> or <tt>:domain</tt> are supplied. Defaults to + # <tt>ActionDispatch::Http::URL.tld_length</tt>, which in turn defaults to 1. + # * <tt>:port</tt> - Optionally specify the port to connect to. + # * <tt>:anchor</tt> - An anchor name to be appended to the path. + # * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2009/" + # * <tt>:script_name</tt> - Specifies application path relative to domain root. If provided, prepends application path. + # + # Any other key (<tt>:controller</tt>, <tt>:action</tt>, etc.) given to + # +url_for+ is forwarded to the Routes module. + # + # url_for controller: 'tasks', action: 'testing', host: 'somehost.org', port: '8080' + # # => 'http://somehost.org:8080/tasks/testing' + # url_for controller: 'tasks', action: 'testing', host: 'somehost.org', anchor: 'ok', only_path: true + # # => '/tasks/testing#ok' + # url_for controller: 'tasks', action: 'testing', trailing_slash: true + # # => 'http://somehost.org/tasks/testing/' + # url_for controller: 'tasks', action: 'testing', host: 'somehost.org', number: '33' + # # => 'http://somehost.org/tasks/testing?number=33' + # url_for controller: 'tasks', action: 'testing', host: 'somehost.org', script_name: "/myapp" + # # => 'http://somehost.org/myapp/tasks/testing' + # url_for controller: 'tasks', action: 'testing', host: 'somehost.org', script_name: "/myapp", only_path: true + # # => '/myapp/tasks/testing' + def url_for(options = nil) + case options + when nil + _routes.url_for(url_options.symbolize_keys) + when Hash + route_name = options.delete :use_route + _routes.url_for(options.symbolize_keys.reverse_merge!(url_options), + route_name) + when String + options + when Symbol + HelperMethodBuilder.url.handle_string_call self, options + when Array + polymorphic_url(options, options.extract_options!) + when Class + HelperMethodBuilder.url.handle_class_call self, options + else + HelperMethodBuilder.url.handle_model_call self, options + end + end + + protected + + def optimize_routes_generation? + _routes.optimize_routes_generation? && default_url_options.empty? + end + + def _with_routes(routes) + old_routes, @_routes = @_routes, routes + yield + ensure + @_routes = old_routes + end + + def _routes_context + self + end + end + end +end |