Don't require action_dispatch in ActionView::UrlHelpers

ActionDispatch::Routing::UrlFor was always required in UrlHelpers. This
was changed by splitting previous implementation of UrlHelper into 2
modules: ActionView::Helpers::UrlHelper and
ActionView::Routing::UrlHelper. The former one keeps only basic
implementation of url_for. The latter adds features that allow to use
routes and is only required when url_helpers or mounted_helpers are
required.

6 files changed, 131 insertions, 98 deletions

diff --git a/actionpack/lib/action_controller.rb b/actionpack/lib/action_controller.rb
index 969481928d..0b96c96a2c 100644
--- a/actionpack/lib/action_controller.rb
+++ b/actionpack/lib/action_controller.rb
@@ -61,6 +61,10 @@ end
 require 'action_view'
 require 'action_view/vendor/html-scanner'
 
+ActiveSupport.on_load(:action_view) do
+  ActionView::RoutingUrlFor.send(:include, ActionDispatch::Routing::UrlFor)
+end
+
 # Common Active Support usage in Action Controller
 require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/core_ext/load_error'
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index f4c708ea33..5177944575 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -95,6 +95,8 @@ module ActionDispatch
 
           self.default_url_options = {}
         end
+
+        include *_url_for_modules if respond_to?(:_url_for_modules)
       end
 
       def initialize(*)
diff --git a/actionpack/lib/action_view.rb b/actionpack/lib/action_view.rb
index 72aba968d1..1cf6937578 100644
--- a/actionpack/lib/action_view.rb
+++ b/actionpack/lib/action_view.rb
@@ -37,6 +37,7 @@ module ActionView
     autoload :LookupContext
     autoload :PathSet
     autoload :RecordIdentifier
+    autoload :RoutingUrlFor
     autoload :Template
 
     autoload_under "renderer" do
diff --git a/actionpack/lib/action_view/helpers/url_helper.rb b/actionpack/lib/action_view/helpers/url_helper.rb
index fe3240fdc1..3f65791aa0 100644
--- a/actionpack/lib/action_view/helpers/url_helper.rb
+++ b/actionpack/lib/action_view/helpers/url_helper.rb
@@ -2,7 +2,6 @@ require 'action_view/helpers/javascript_helper'
 require 'active_support/core_ext/array/access'
 require 'active_support/core_ext/hash/keys'
 require 'active_support/core_ext/string/output_safety'
-require 'action_dispatch'
 
 module ActionView
   # = Action View URL Helpers
@@ -20,115 +19,34 @@ module ActionView
 
       extend ActiveSupport::Concern
 
-      include ActionDispatch::Routing::UrlFor
       include TagHelper
 
-      # We need to override url_options, _routes_context
-      # and optimize_routes_generation? to consider the controller.
-
-      def url_options #:nodoc:
-        return super unless controller.respond_to?(:url_options)
-        controller.url_options
-      end
-
-      def _routes_context #:nodoc:
-        controller
-      end
-      protected :_routes_context
-
-      def optimize_routes_generation? #:nodoc:
-        controller.respond_to?(:optimize_routes_generation?) ?
-          controller.optimize_routes_generation? : super
+      module ClassMethods
+        def _url_for_modules
+          ActionView::RoutingUrlFor
+        end
       end
-      protected :optimize_routes_generation?
 
-      # Returns the URL for the set of +options+ provided. This takes the
-      # same options as +url_for+ in Action Controller (see the
-      # documentation for <tt>ActionController::Base#url_for</tt>). Note that by default
-      # <tt>:only_path</tt> is <tt>true</tt> so you'll get the relative "/controller/action"
-      # instead of the fully qualified URL like "http://example.com/controller/action".
-      #
-      # ==== Options
-      # * <tt>:anchor</tt> - Specifies the anchor name to be appended to the path.
-      # * <tt>:only_path</tt> - If true, returns the relative URL (omitting the protocol, host name, and port) (<tt>true</tt> by default unless <tt>:host</tt> is specified).
-      # * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2005/". Note that this
-      #   is currently not recommended since it breaks caching.
-      # * <tt>:host</tt> - Overrides the default (current) host if provided.
-      # * <tt>:protocol</tt> - Overrides the default (current) protocol if provided.
-      # * <tt>:user</tt> - Inline HTTP authentication (only plucked out if <tt>:password</tt> is also present).
-      # * <tt>:password</tt> - Inline HTTP authentication (only plucked out if <tt>:user</tt> is also present).
-      #
-      # ==== Relying on named routes
-      #
-      # Passing a record (like an Active Record) instead of a hash as the options parameter will
-      # trigger the named route for that record. The lookup will happen on the name of the class. So passing a
-      # Workshop object will attempt to use the +workshop_path+ route. If you have a nested route, such as
-      # +admin_workshop_path+ you'll have to call that explicitly (it's impossible for +url_for+ to guess that route).
-      #
-      # ==== Implicit Controller Namespacing
-      #
-      # Controllers passed in using the +:controller+ option will retain their namespace unless it is an absolute one.
-      #
-      # ==== Examples
-      #   <%= url_for(:action => 'index') %>
-      #   # => /blog/
-      #
-      #   <%= url_for(:action => 'find', :controller => 'books') %>
-      #   # => /books/find
-      #
-      #   <%= url_for(:action => 'login', :controller => 'members', :only_path => false, :protocol => 'https') %>
-      #   # => https://www.example.com/members/login/
-      #
-      #   <%= url_for(:action => 'play', :anchor => 'player') %>
-      #   # => /messages/play/#player
-      #
-      #   <%= url_for(:action => 'jump', :anchor => 'tax&ship') %>
-      #   # => /testing/jump/#tax&ship
-      #
-      #   <%= url_for(Workshop.new) %>
-      #   # relies on Workshop answering a persisted? call (and in this case returning false)
-      #   # => /workshops
-      #
-      #   <%= url_for(@workshop) %>
-      #   # calls @workshop.to_param which by default returns the id
-      #   # => /workshops/5
-      #
-      #   # to_param can be re-defined in a model to provide different URL names:
-      #   # => /workshops/1-workshop-name
-      #
-      #   <%= url_for("http://www.example.com") %>
-      #   # => http://www.example.com
-      #
-      #   <%= url_for(:back) %>
-      #   # if request.env["HTTP_REFERER"] is set to "http://www.example.com"
-      #   # => http://www.example.com
-      #
-      #   <%= url_for(:back) %>
-      #   # if request.env["HTTP_REFERER"] is not set or is blank
-      #   # => javascript:history.back()
-      #
-      #   <%= url_for(:action => 'index', :controller => 'users') %>
-      #   # Assuming an "admin" namespace
-      #   # => /admin/users
-      #
-      #   <%= url_for(:action => 'index', :controller => '/users') %>
-      #   # Specify absolute path with beginning slash
-      #   # => /users
-      def url_for(options = nil)
+      # Basic implementation of url_for to allow use helpers without routes existence
+      def url_for(options = nil) # :nodoc:
         case options
         when String
           options
-        when nil, Hash
-          options ||= {}
-          options = { :only_path => options[:host].nil? }.merge!(options.symbolize_keys)
-          super
         when :back
-          controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
+          _back_url
         else
-          polymorphic_path(options)
+          raise ArgumentError, "arguments passed to url_for can't be handled. Please require " +
+                               "routes or provide your own implementation"
         end
       end
 
+      def _back_url # :nodoc:
+        referrer = controller.respond_to?(:request) && controller.request.env["HTTP_REFERER"]
+        referrer || 'javascript:history.back()'
+      end
+      protected :_back_url
+
+
       # Creates a link tag of the given +name+ using a URL created by the set of +options+.
       # See the valid options in the documentation for +url_for+. It's also possible to
       # pass a String instead of an options hash, which generates a link tag that uses the
diff --git a/actionpack/lib/action_view/routing_url_for.rb b/actionpack/lib/action_view/routing_url_for.rb
new file mode 100644
index 0000000000..13fb6406e1
--- /dev/null
+++ b/actionpack/lib/action_view/routing_url_for.rb
@@ -0,0 +1,107 @@
+module ActionView
+  module RoutingUrlFor
+
+    # Returns the URL for the set of +options+ provided. This takes the
+    # same options as +url_for+ in Action Controller (see the
+    # documentation for <tt>ActionController::Base#url_for</tt>). Note that by default
+    # <tt>:only_path</tt> is <tt>true</tt> so you'll get the relative "/controller/action"
+    # instead of the fully qualified URL like "http://example.com/controller/action".
+    #
+    # ==== Options
+    # * <tt>:anchor</tt> - Specifies the anchor name to be appended to the path.
+    # * <tt>:only_path</tt> - If true, returns the relative URL (omitting the protocol, host name, and port) (<tt>true</tt> by default unless <tt>:host</tt> is specified).
+    # * <tt>:trailing_slash</tt> - If true, adds a trailing slash, as in "/archive/2005/". Note that this
+    #   is currently not recommended since it breaks caching.
+    # * <tt>:host</tt> - Overrides the default (current) host if provided.
+    # * <tt>:protocol</tt> - Overrides the default (current) protocol if provided.
+    # * <tt>:user</tt> - Inline HTTP authentication (only plucked out if <tt>:password</tt> is also present).
+    # * <tt>:password</tt> - Inline HTTP authentication (only plucked out if <tt>:user</tt> is also present).
+    #
+    # ==== Relying on named routes
+    #
+    # Passing a record (like an Active Record) instead of a hash as the options parameter will
+    # trigger the named route for that record. The lookup will happen on the name of the class. So passing a
+    # Workshop object will attempt to use the +workshop_path+ route. If you have a nested route, such as
+    # +admin_workshop_path+ you'll have to call that explicitly (it's impossible for +url_for+ to guess that route).
+    #
+    # ==== Implicit Controller Namespacing
+    #
+    # Controllers passed in using the +:controller+ option will retain their namespace unless it is an absolute one.
+    #
+    # ==== Examples
+    #   <%= url_for(:action => 'index') %>
+    #   # => /blog/
+    #
+    #   <%= url_for(:action => 'find', :controller => 'books') %>
+    #   # => /books/find
+    #
+    #   <%= url_for(:action => 'login', :controller => 'members', :only_path => false, :protocol => 'https') %>
+    #   # => https://www.example.com/members/login/
+    #
+    #   <%= url_for(:action => 'play', :anchor => 'player') %>
+    #   # => /messages/play/#player
+    #
+    #   <%= url_for(:action => 'jump', :anchor => 'tax&ship') %>
+    #   # => /testing/jump/#tax&ship
+    #
+    #   <%= url_for(Workshop.new) %>
+    #   # relies on Workshop answering a persisted? call (and in this case returning false)
+    #   # => /workshops
+    #
+    #   <%= url_for(@workshop) %>
+    #   # calls @workshop.to_param which by default returns the id
+    #   # => /workshops/5
+    #
+    #   # to_param can be re-defined in a model to provide different URL names:
+    #   # => /workshops/1-workshop-name
+    #
+    #   <%= url_for("http://www.example.com") %>
+    #   # => http://www.example.com
+    #
+    #   <%= url_for(:back) %>
+    #   # if request.env["HTTP_REFERER"] is set to "http://www.example.com"
+    #   # => http://www.example.com
+    #
+    #   <%= url_for(:back) %>
+    #   # if request.env["HTTP_REFERER"] is not set or is blank
+    #   # => javascript:history.back()
+    #
+    #   <%= url_for(:action => 'index', :controller => 'users') %>
+    #   # Assuming an "admin" namespace
+    #   # => /admin/users
+    #
+    #   <%= url_for(:action => 'index', :controller => '/users') %>
+    #   # Specify absolute path with beginning slash
+    #   # => /users
+    def url_for(options = nil)
+      case options
+      when String
+        options
+      when nil, Hash
+        options ||= {}
+        options = { :only_path => options[:host].nil? }.merge!(options.symbolize_keys)
+        super
+      when :back
+        _back_url
+      else
+        polymorphic_path(options)
+      end
+    end
+
+    def url_options #:nodoc:
+      return super unless controller.respond_to?(:url_options)
+      controller.url_options
+    end
+
+    def _routes_context #:nodoc:
+      controller
+    end
+    protected :_routes_context
+
+    def optimize_routes_generation? #:nodoc:
+      controller.respond_to?(:optimize_routes_generation?) ?
+        controller.optimize_routes_generation? : super
+    end
+    protected :optimize_routes_generation?
+  end
+end
diff --git a/actionpack/lib/action_view/test_case.rb b/actionpack/lib/action_view/test_case.rb
index 17c70b7e95..434fc8cc14 100644
--- a/actionpack/lib/action_view/test_case.rb
+++ b/actionpack/lib/action_view/test_case.rb
@@ -42,6 +42,7 @@ module ActionView
       include AbstractController::Helpers
       include ActionView::Helpers
       include ActionView::RecordIdentifier
+      include ActionView::RoutingUrlFor
 
       delegate :lookup_context, :to => :controller
       attr_accessor :controller, :output_buffer, :rendered