diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 388f695187068..62fb7977cc5c9 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -433,6 +433,8 @@ def merge_shallow_scope(parent, child)
       end
 
       module Resources
+        MERGE_FROM_SCOPE_OPTIONS = [:shallow, :constraints]
+
         class Resource #:nodoc:
           def self.default_actions
             [:index, :create, :new, :show, :update, :destroy, :edit]
@@ -591,8 +593,6 @@ def resources_path_names(options)
 
         def resource(*resources, &block)
           options = resources.extract_options!
-          options = (@scope[:options] || {}).merge(options)
-          options[:shallow] = true if @scope[:shallow] && !options.has_key?(:shallow)
 
           if apply_common_behavior_for(:resource, resources, options, &block)
             return self
@@ -619,8 +619,6 @@ def resource(*resources, &block)
 
         def resources(*resources, &block)
           options = resources.extract_options!
-          options = (@scope[:options] || {}).merge(options)
-          options[:shallow] = true if @scope[:shallow] && !options.has_key?(:shallow)
 
           if apply_common_behavior_for(:resources, resources, options, &block)
             return self
@@ -804,6 +802,10 @@ def apply_common_behavior_for(method, resources, options, &block)
               return true
             end
 
+            scope_options = @scope.slice(*MERGE_FROM_SCOPE_OPTIONS).delete_if{ |k,v| v.blank? }
+            options.reverse_merge!(scope_options) unless scope_options.empty?
+            options.reverse_merge!(@scope[:options]) unless @scope[:options].blank?
+
             if resource_scope?
               nested do
                 send(method, resources.pop, options, &block)
diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index 0548456b639d8..b5653a391a638 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -334,6 +334,13 @@ def self.matches?(request)
         get '/tickets', :to => 'tickets#index', :as => :tickets
       end
 
+      scope :constraints => { :id => /\d{4}/ } do
+        resources :movies do
+          resources :reviews
+          resource :trailer
+        end
+      end
+
       match '/:locale/*file.:format', :to => 'files#show', :file => /path\/to\/existing\/file/
     end
   end
@@ -1558,6 +1565,42 @@ def test_router_removes_invalid_conditions
     end
   end
 
+  def test_constraints_are_merged_from_scope
+    with_test_routes do
+      get '/movies/0001'
+      assert_equal 'movies#show', @response.body
+      assert_equal '/movies/0001', movie_path(:id => '0001')
+
+      get '/movies/00001'
+      assert_equal 'Not Found', @response.body
+      assert_raises(ActionController::RoutingError){ movie_path(:id => '00001') }
+
+      get '/movies/0001/reviews'
+      assert_equal 'reviews#index', @response.body
+      assert_equal '/movies/0001/reviews', movie_reviews_path(:movie_id => '0001')
+
+      get '/movies/00001/reviews'
+      assert_equal 'Not Found', @response.body
+      assert_raises(ActionController::RoutingError){ movie_reviews_path(:movie_id => '00001') }
+
+      get '/movies/0001/reviews/0001'
+      assert_equal 'reviews#show', @response.body
+      assert_equal '/movies/0001/reviews/0001', movie_review_path(:movie_id => '0001', :id => '0001')
+
+      get '/movies/00001/reviews/0001'
+      assert_equal 'Not Found', @response.body
+      assert_raises(ActionController::RoutingError){ movie_path(:movie_id => '00001', :id => '00001') }
+
+      get '/movies/0001/trailer'
+      assert_equal 'trailers#show', @response.body
+      assert_equal '/movies/0001/trailer', movie_trailer_path(:movie_id => '0001')
+
+      get '/movies/00001/trailer'
+      assert_equal 'Not Found', @response.body
+      assert_raises(ActionController::RoutingError){ movie_trailer_path(:movie_id => '00001') }
+    end
+  end
+
   private
     def with_test_routes
       yield