From f360689586814c8e81f050e13b88bfd978ae69eb Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Sat, 8 Aug 2015 18:48:27 -0700
Subject: stop calling `scope` internally

we need to get a grip on what `scope` actually does.  This commit
removes some of the internal calls to `scope`.  Eventually we should add
public facing methods that provide the API that `scope` is trying to
accomplish.
---
 actionpack/lib/action_dispatch/routing/mapper.rb   | 30 +++++++++++++++++-----
 .../lib/action_dispatch/routing/route_set.rb       |  7 +----
 2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index d5f641a88a..52519188a9 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -1397,7 +1397,7 @@ module ActionDispatch
           end
 
           with_scope_level(:collection) do
-            scope(parent_resource.collection_scope) do
+            path_scope(parent_resource.collection_scope) do
               yield
             end
           end
@@ -1423,7 +1423,7 @@ module ActionDispatch
             if shallow?
               shallow_scope(parent_resource.member_scope) { yield }
             else
-              scope(parent_resource.member_scope) { yield }
+              path_scope(parent_resource.member_scope) { yield }
             end
           end
         end
@@ -1434,7 +1434,7 @@ module ActionDispatch
           end
 
           with_scope_level(:new) do
-            scope(parent_resource.new_scope(action_path(:new))) do
+            path_scope(parent_resource.new_scope(action_path(:new))) do
               yield
             end
           end
@@ -1464,9 +1464,10 @@ module ActionDispatch
         end
 
         def shallow
-          scope(:shallow => true) do
-            yield
-          end
+          @scope = @scope.new(shallow: true)
+          yield
+        ensure
+          @scope = @scope.parent
         end
 
         def shallow?
@@ -1683,7 +1684,7 @@ module ActionDispatch
             @nesting.push(resource)
 
             with_scope_level(kind) do
-              scope(parent_resource.resource_scope) { yield }
+              controller_scope(parent_resource.resource_scope[:controller]) { yield }
             end
           ensure
             @nesting.pop
@@ -1795,6 +1796,21 @@ module ActionDispatch
           def api_only?
             @set.api_only?
           end
+        private
+
+        def controller_scope(controller)
+          @scope = @scope.new(controller: controller)
+          yield
+        ensure
+          @scope = @scope.parent
+        end
+
+        def path_scope(path)
+          @scope = @scope.new(path: merge_path_scope(@scope[:path], path))
+          yield
+        ensure
+          @scope = @scope.parent
+        end
       end
 
       # Routing Concerns allow you to declare common routes that can be reused
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index dd78b9d4fd..c97c8ba0f0 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -54,12 +54,7 @@ module ActionDispatch
         # delegate the control back to Rack cascade. Besides, if this is not a default
         # controller, it means we should respect the @scope[:module] parameter.
         def controller(params, raise_on_name_error=true)
-          if params.key?(:controller)
-            controller_param = params[:controller]
-            controller_reference(controller_param)
-          else
-            yield
-          end
+          controller_reference params.fetch(:controller) { yield }
         rescue NameError => e
           raise ActionController::RoutingError, e.message, e.backtrace if raise_on_name_error
         end
-- 
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