diff --git a/railties/lib/rails/generators/actions.rb b/railties/lib/rails/generators/actions.rb
index b6225cd8c0..8b525ae86e 100644
--- a/railties/lib/rails/generators/actions.rb
+++ b/railties/lib/rails/generators/actions.rb
@@ -254,7 +254,12 @@ module Rails
       # Make an entry in Rails routing file <tt>config/routes.rb</tt>
       #
       #   route "root 'welcome#index'"
-      def route(routing_code)
+      #   route "root 'admin#index'", namespace: :admin
+      def route(routing_code, namespace: nil)
+        routing_code = Array(namespace).reverse.reduce(routing_code) do |code, ns|
+          "namespace :#{ns} do\n#{indent(code, 2)}\nend"
+        end
+
         log :route, routing_code
         sentinel = /\.routes\.draw do\s*\n/m
 
@@ -327,12 +332,7 @@ module Rails
         # Returns optimized string with indentation
         def optimize_indentation(value, amount = 0) # :doc:
           return "#{value}\n" unless value.is_a?(String)
-
-          if value.lines.size > 1
-            value.strip_heredoc.indent(amount)
-          else
-            "#{value.strip.indent(amount)}\n"
-          end
+          "#{value.strip_heredoc.indent(amount).chomp}\n"
         end
 
         # Indent the +Gemfile+ to the depth of @indentation
diff --git a/railties/lib/rails/generators/rails/controller/controller_generator.rb b/railties/lib/rails/generators/rails/controller/controller_generator.rb
index 2ccc1c18c0..618954741e 100644
--- a/railties/lib/rails/generators/rails/controller/controller_generator.rb
+++ b/railties/lib/rails/generators/rails/controller/controller_generator.rb
@@ -17,7 +17,8 @@ module Rails
       def add_routes
         return if options[:skip_routes]
         return if actions.empty?
-        route generate_routing_code
+        routing_code = actions.map { |action| "get '#{file_name}/#{action}'" }.join("\n")
+        route routing_code, namespace: regular_class_path
       end
 
       hook_for :template_engine, :test_framework, :helper, :assets do |generator|
@@ -32,45 +33,6 @@ module Rails
         def remove_possible_suffix(name)
           name.sub(/_?controller$/i, "")
         end
-
-        # This method creates nested route entry for namespaced resources.
-        # For e.g. rails g controller foo/bar/baz index show
-        # Will generate -
-        # namespace :foo do
-        #   namespace :bar do
-        #     get 'baz/index'
-        #     get 'baz/show'
-        #   end
-        # end
-        def generate_routing_code
-          depth = 0
-          lines = []
-
-          # Create 'namespace' ladder
-          # namespace :foo do
-          #   namespace :bar do
-          regular_class_path.each do |ns|
-            lines << indent("namespace :#{ns} do\n", depth * 2)
-            depth += 1
-          end
-
-          # Create route
-          #     get 'baz/index'
-          #     get 'baz/show'
-          actions.each do |action|
-            lines << indent(%{get '#{file_name}/#{action}'\n}, depth * 2)
-          end
-
-          # Create `end` ladder
-          #   end
-          # end
-          until depth.zero?
-            depth -= 1
-            lines << indent("end\n", depth * 2)
-          end
-
-          lines.join
-        end
     end
   end
 end
diff --git a/railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb b/railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb
index 9a92991efe..24ef9e7ff0 100644
--- a/railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb
+++ b/railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb
@@ -16,32 +16,7 @@ module Rails
       #   end
       def add_resource_route
         return if options[:actions].present?
-
-        depth = 0
-        lines = []
-
-        # Create 'namespace' ladder
-        # namespace :foo do
-        #   namespace :bar do
-        regular_class_path.each do |ns|
-          lines << indent("namespace :#{ns} do\n", depth * 2)
-          depth += 1
-        end
-
-        # inserts the primary resource
-        # Create route
-        #     resources 'products'
-        lines << indent(%{resources :#{file_name.pluralize}\n}, depth * 2)
-
-        # Create `end` ladder
-        #   end
-        # end
-        until depth.zero?
-          depth -= 1
-          lines << indent("end\n", depth * 2)
-        end
-
-        route lines.join
+        route "resources :#{file_name.pluralize}", namespace: regular_class_path
       end
     end
   end
diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb
index 5d6d7f1595..8c90d4b9f5 100644
--- a/railties/test/generators/actions_test.rb
+++ b/railties/test/generators/actions_test.rb
@@ -494,57 +494,59 @@ class ActionsTest < Rails::Generators::TestCase
     end
   end
 
-  def test_route_should_add_data_to_the_routes_block_in_config_routes
+  test "route should add route" do
     run_generator
-    route_command = "route '/login', controller: 'sessions', action: 'new'"
-    action :route, route_command
-    assert_file "config/routes.rb", /#{Regexp.escape(route_command)}/
+    route_commands = ["get 'foo'", "get 'bar'", "get 'baz'"]
+    route_commands.each do |route_command|
+      action :route, route_command
+    end
+    assert_routes route_commands
   end
 
-  def test_route_should_be_idempotent
+  test "route should indent routing code" do
     run_generator
-    route_path = File.expand_path("config/routes.rb", destination_root)
+    route_commands = ["get 'foo'", "get 'bar'", "get 'baz'"]
+    action :route, route_commands.join("\n")
+    assert_routes route_commands
+  end
 
-    # runs first time, not asserting
-    action :route, "root 'welcome#index'"
-    content_1 = File.read(route_path)
+  test "route should be idempotent" do
+    run_generator
+    route_command = "root 'welcome#index'"
+
+    # runs first time
+    action :route, route_command
+    assert_routes route_command
+
+    content = File.read(File.expand_path("config/routes.rb", destination_root))
 
     # runs second time
-    action :route, "root 'welcome#index'"
-    content_2 = File.read(route_path)
-
-    assert_equal content_1, content_2
+    action :route, route_command
+    assert_file "config/routes.rb", content
   end
 
-  def test_route_should_add_data_with_an_new_line
+  test "route with namespace option should nest route" do
     run_generator
-    action :route, "root 'welcome#index'"
-    route_path = File.expand_path("config/routes.rb", destination_root)
-    content = File.read(route_path)
+    action :route, "get 'foo'\nget 'bar'", namespace: :baz
+    assert_routes <<~ROUTING_CODE.chomp
+      namespace :baz do
+        get 'foo'
+        get 'bar'
+      end
+    ROUTING_CODE
+  end
 
-    # Remove all of the comments and blank lines from the routes file
-    content.gsub!(/^  \#.*\n/, "")
-    content.gsub!(/^\n/, "")
-
-    File.write(route_path, content)
-
-    routes = <<-F
-Rails.application.routes.draw do
-  root 'welcome#index'
-end
-F
-
-    assert_file "config/routes.rb", routes
-
-    action :route, "resources :product_lines"
-
-    routes = <<-F
-Rails.application.routes.draw do
-  resources :product_lines
-  root 'welcome#index'
-end
-F
-    assert_file "config/routes.rb", routes
+  test "route with namespace option array should deeply nest route" do
+    run_generator
+    action :route, "get 'foo'\nget 'bar'", namespace: %w[baz qux]
+    assert_routes <<~ROUTING_CODE.chomp
+      namespace :baz do
+        namespace :qux do
+          get 'foo'
+          get 'bar'
+        end
+      end
+    ROUTING_CODE
   end
 
   def test_readme
@@ -584,4 +586,18 @@ F
     def action(*args, &block)
       capture(:stdout) { generator.send(*args, &block) }
     end
+
+    def assert_routes(*route_commands)
+      route_regexps = route_commands.flatten.map do |route_command|
+        %r{
+          ^#{Regexp.escape("Rails.application.routes.draw do")}\n
+            (?:[ ]{2}.+\n|\n)*
+            #{Regexp.escape(route_command.indent(2))}\n
+            (?:[ ]{2}.+\n|\n)*
+          end\n
+        }x
+      end
+
+      assert_file "config/routes.rb", *route_regexps
+    end
 end