无效常量API:：与葡萄和葡萄实体

Question

我正在尝试使用grape-entity，我在实体类的名称空间上遇到了问题，但我无法理解原因。

我有一个葡萄实体类：

# app/controllers/api/v1/entities/vehicules.rb
module API
  module V1
    module Entities
      class Vehicules < Grape::Entity
        expose :marque
        expose :modele
        expose :user do 
          expose :name
        end
      end
    end
  end
end

葡萄级：

# app/controllers/api/v1/vehicules.rb
module API
  module V1
    class Vehicules < Grape::API
      include API::V1::Defaults
      version 'v1' 
      format :json 


      resource :vehicules do
        desc "Return list of vehicules"
          get do
            #authenticate! @todo
            vehicules = Vehicule.find_by(user_id: params['user_id'])
            present vehicules, with API::V1::Entities::Vehicules
          end

当我调用curl http://localhost:3000/api/v1/vehicules?user_id=123时，在rails服务器中有这样的消息：

Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:457:in `load':
app/controllers/api/v1/vehicules.rb:21: syntax error, unexpected tCONSTANT, expecting keyword_do or '{' or (' SyntaxError) 
present vehicules, with API::V1::Entities::Vehicules
                           ^

任何帮助都会很好。

Answer 1

是with:

present vehicules, with: API::V1::Entities::Vehicules