Add carts_controller to controller generator

.rspec_status

-example_id                                 | status  | run_time        |
------------------------------------------- | ------- | --------------- |
-./spec/shotengai/models_spec.rb[1:1:1:1]   | passed  | 0.58762 seconds |
-./spec/shotengai/models_spec.rb[1:1:1:2]   | passed  | 0.3368 seconds  |
-./spec/shotengai/models_spec.rb[1:1:2:1]   | failed  | 0.68851 seconds |
-./spec/shotengai/models_spec.rb[1:1:2:2]   | passed  | 0.70395 seconds |
-./spec/shotengai/models_spec.rb[1:1:2:3]   | passed  | 0.6569 seconds  |
-./spec/shotengai/models_spec.rb[1:1:2:4]   | unknown |                 |
-./spec/shotengai/models_spec.rb[1:1:3:1]   | passed  | 0.32973 seconds |
-./spec/shotengai/models_spec.rb[1:1:3:2]   | passed  | 0.33056 seconds |
-./spec/shotengai/models_spec.rb[1:1:3:3]   | passed  | 0.33828 seconds |
-./spec/shotengai/models_spec.rb[1:1:4:1]   | passed  | 0.35822 seconds |
-./spec/shotengai/models_spec.rb[1:1:5:1]   | passed  | 0.33872 seconds |
-./spec/shotengai/models_spec.rb[1:1:5:2:1] | passed  | 0.36586 seconds |
-./spec/shotengai/models_spec.rb[1:1:5:2:2] | passed  | 0.36069 seconds |
-./spec/shotengai/models_spec.rb[1:2:1:1]   | passed  | 0.34614 seconds |
-./spec/shotengai/models_spec.rb[1:2:1:2]   | passed  | 0.3256 seconds  |
-./spec/shotengai/models_spec.rb[1:2:2:1]   | passed  | 0.62601 seconds |
-./spec/shotengai/models_spec.rb[1:2:2:2]   | passed  | 0.45201 seconds |
-./spec/shotengai/models_spec.rb[1:3:1]     | passed  | 0.48308 seconds |
+example_id                                 | status | run_time        |
+------------------------------------------ | ------ | --------------- |
+./spec/shotengai/models_spec.rb[1:1:1:1]   | passed | 0.76841 seconds |
+./spec/shotengai/models_spec.rb[1:1:1:2]   | passed | 0.39895 seconds |
+./spec/shotengai/models_spec.rb[1:1:2:1]   | passed | 0.40877 seconds |
+./spec/shotengai/models_spec.rb[1:1:2:2]   | passed | 0.40292 seconds |
+./spec/shotengai/models_spec.rb[1:1:2:3]   | passed | 0.40936 seconds |
+./spec/shotengai/models_spec.rb[1:1:2:4]   | passed | 0.39549 seconds |
+./spec/shotengai/models_spec.rb[1:1:3:1]   | passed | 0.36859 seconds |
+./spec/shotengai/models_spec.rb[1:1:3:2]   | passed | 0.3979 seconds  |
+./spec/shotengai/models_spec.rb[1:1:3:3]   | passed | 0.40805 seconds |
+./spec/shotengai/models_spec.rb[1:1:4:1]   | failed | 0.66932 seconds |
+./spec/shotengai/models_spec.rb[1:1:5:1]   | passed | 0.38994 seconds |
+./spec/shotengai/models_spec.rb[1:1:5:2:1] | passed | 0.48448 seconds |
+./spec/shotengai/models_spec.rb[1:1:5:2:2] | failed | 0.56715 seconds |
+./spec/shotengai/models_spec.rb[1:2:1:1]   | passed | 0.40297 seconds |
+./spec/shotengai/models_spec.rb[1:2:1:2]   | passed | 0.3698 seconds  |
+./spec/shotengai/models_spec.rb[1:2:2:1]   | passed | 0.66138 seconds |
+./spec/shotengai/models_spec.rb[1:2:2:2]   | passed | 0.48194 seconds |
+./spec/shotengai/models_spec.rb[1:3:1]     | passed | 0.37498 seconds |

lib/generators/shotengai/controllers_generator.rb

@@ -49,11 +49,12 @@ module Shotengai
           'orders' => @order,
           'product_series' => "#{@product}Series",
           'product_snapshots' => "#{@product}Snapshot",
+          'carts' => '::Order::Cart',
           
         }.each do |key, klass_name|
           @key, @klass_name = key, klass_name
           template "template_controller.rb",
-                   "app/controllers/#{@namespace}/#{@klass_name.underscore.pluralize}_controller.rb"
+                   "app/controllers/#{@namespace}/#{@key}_controller.rb"
         end
         create_routes
         create_factory