如何解決 ruby on rails 中的無方法錯誤？

Question

我正確定義了我的路線和 controller 動作。 我仍然收到無方法錯誤。

這是我的代碼：

路線：

 get "/restaurants", to: "restaurants#index"

Controller 動作：

def index
  resto = Restaurant.all
  render json: resto,status: :ok
end

這是我在瀏覽器中的錯誤：

NoMethodError in RestaurantsController#index
undefined method `type' for #<Restaurant:0x00007fb711a07628>
Extracted source (around line #4):
              
    def index
     resto=Restaurant.all
    ( render json: resto,status: :ok) # this is the line throwing error

    end
end

這是控制台中的問題

Use Ctrl-C to stop
Started GET "/restaurants" for ::1 at 2022-08-16 22:26:25 +0530
   (0.7ms)  SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
Processing by RestaurantsController#index as HTML
  Restaurant Load (1.2ms)  SELECT "restaurants".* FROM "restaurants"
  ↳ app/controllers/restaurants_controller.rb:4:in `index'
[active_model_serializers] Rendered ActiveModel::Serializer::CollectionSerializer with ActiveModelSerializers::Adapter::Attributes (12.1ms)
Completed 500 Internal Server Error in 38ms (ActiveRecord: 7.5ms | Allocations: 17269)