Use env['action_dispatch.routes'] to determine if we should generate prefix or not.

This technique is here to allow using routes from Engine in Application
and vice versa. When using Engine routes inside Application it should
generate prefix based on mount point. When using Engine routes inside
Engine it should use env['SCRIPT_NAME']. In any other case it should
generate prefix as env should not be even available.

1 files changed, 27 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index a2570cb877..f3aa09f4a7 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -261,7 +261,11 @@ module ActionDispatch
 
           raise "A rack application must be specified" unless path
 
+          options[:as] ||= app_name(app)
+
           match(path, options.merge(:to => app, :anchor => false, :format => false))
+
+          define_generate_prefix(app, options[:as])
           self
         end
 
@@ -269,6 +273,29 @@ module ActionDispatch
           @set.default_url_options = options
         end
         alias_method :default_url_options, :default_url_options=
+
+        private
+          def app_name(app)
+            return unless app.respond_to?(:routes)
+            class_name = app.class.is_a?(Class) ? app.name : app.class.name
+            ActiveSupport::Inflector.underscore(class_name).gsub("/", "_")
+          end
+
+          def define_generate_prefix(app, name)
+            return unless app.respond_to?(:routes)
+
+            _route = @set.named_routes.routes[name.to_sym]
+            _router = @set
+            app.routes.class_eval do
+              define_method :_generate_prefix do |options|
+                keys = _route.segment_keys + ActionDispatch::Routing::RouteSet::RESERVED_OPTIONS
+                prefix_options = options.reject { |k, v| !(keys).include?(k) }
+                # we must actually delete prefix segment keys to avoid passing them to next url_for
+                _route.segment_keys.each { |k| options.delete(k) }
+                _router.url_helpers.send("#{name}_path", prefix_options)
+              end
+            end
+          end
       end
 
       module HttpHelpers