Question

对于个人项目，我想在Rails 4中创建一个Restful Web服务。

因此，我使用rails-api创建了我的第一个项目，并添加以下代码：

MyProject＆gt;中的

routes.rb config 目录

MyProject::Application.routes.draw do
    namespace :api, defaults: {format: 'json'} do
        namespace :v1 do
            resources :users
        end
    end
end

MyProject＆gt;中的

users_controller.rb app＆gt;控制器＆gt; api> v1＆gt;用户目录

module Api
    module V1
        class UsersController < ApplicationController
            def index
            end

            def create
            end

            def show
            end

            def update
            end

            def delete
            end
        end 
    end
end

当我使用命令行rails s启动rails服务器并转到此URL时：http://localhost:3000/api/v1/users/show我收到此错误：

未初始化的常量Api :: V1 :: UsersController

Rails.root：/ Users / Jean / Development / MyProject

应用程序跟踪|框架跟踪|完整跟踪activesupport（4.0.4）   lib / active_support / inflector / methods.rb：228：在const_get' activesupport (4.0.4) lib/active_support/inflector/methods.rb:228:in块中进行constantize＆＃39; activesupport（4.0.4）   lib / active_support / inflector / methods.rb：224：在each' activesupport (4.0.4) lib/active_support/inflector/methods.rb:224:in注入＆＃39;   activesupport（4.0.4）lib / active_support / inflector / methods.rb：224：in   constantize' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:76:in controller_reference＆＃39;   actionpack（4.0.4）lib / action_dispatch / routing / route_set.rb：66：in   controller' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:44:in呼叫＆＃39; ActionPack的   （4.0.4）lib / action_dispatch / journey / router.rb：71：block in call' actionpack (4.0.4) lib/action_dispatch/journey/router.rb:59:in每个＆＃39;   actionpack（4.0.4）lib / action_dispatch / journey / router.rb：59：call' actionpack (4.0.4) lib/action_dispatch/routing/route_set.rb:674:in来电＆＃39; rack（1.5.2）lib / rack / etag.rb:23:in call' rack (1.5.2) lib/rack/conditionalget.rb:25:in call＆＃39;机架（1.5.2）   lib / rack / head.rb:11:in call' actionpack (4.0.4) lib/action_dispatch/middleware/params_parser.rb:27:in来电＆＃39;   activerecord（4.0.4）lib / active_record / query_cache.rb:36:in call' activerecord (4.0.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in call＆＃39; activerecord（4.0.4）lib / active_record / migration.rb：373：in   call' actionpack (4.0.4) lib/action_dispatch/middleware/callbacks.rb:29:in阻止通话＆＃39;   activesupport（4.0.4）lib / active_support / callbacks.rb：373：in   _run__4323212420903942114__call__callbacks' activesupport (4.0.4) lib/active_support/callbacks.rb:80:in run_callbacks＆＃39; ActionPack的   （4.0.4）lib / action_dispatch / middleware / callbacks.rb:27:in call' actionpack (4.0.4) lib/action_dispatch/middleware/reloader.rb:64:in call＆＃39; actionpack（4.0.4）   lib / action_dispatch / middleware / remote_ip.rb:76:in call' actionpack (4.0.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in来电＆＃39; actionpack（4.0.4）   lib / action_dispatch / middleware / show_exceptions.rb:30:in call' railties (4.0.4) lib/rails/rack/logger.rb:38:in call_app＆＃39; railties   （4.0.4）lib / rails / rack / logger.rb：20：在block in call' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in块中标记为＆＃39;   activesupport（4.0.4）lib / active_support / tagged_logging.rb:26:in   tagged' activesupport (4.0.4) lib/active_support/tagged_logging.rb:68:in标记＆＃39;铁路（4.0.4）   lib / rails / rack / logger.rb:20:in call' actionpack (4.0.4) lib/action_dispatch/middleware/request_id.rb:21:in来电＆＃39;机架（1.5.2）   lib / rack / runtime.rb:17:in call' activesupport (4.0.4) lib/active_support/cache/strategy/local_cache.rb:83:in call＆＃39;架   （1.5.2）lib / rack / lock.rb:17:in call' actionpack (4.0.4) lib/action_dispatch/middleware/static.rb:64:in call＆＃39;铁路（4.0.4）   lib / rails / engine.rb：511：call' railties (4.0.4) lib/rails/application.rb:97:in来电＆＃39;机架（1.5.2）   lib / rack / lock.rb:17:in call' rack (1.5.2) lib/rack/content_length.rb:14:in来电＆＃39;机架（1.5.2）   lib / rack / handler / webrick.rb:60:in service' /Users/Jean/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:138:in service＆＃39;   /Users/Jean/.rvm/rubies/ruby-2.1.2/lib/ruby/2.1.0/webrick/httpserver.rb:94:in   {_ 1}}阻止了start_thread＆＃39;

我在Stackoverflow上发现了很多相同错误的帖子，但答案并没有帮助我解决问题。

谢谢！

Answer 1

如果你有这条路：

MyProject＆gt; app＆gt;控制器＆gt; api> v1＆gt;用户

控制器应为class Api::V1::Users::UsersController 如果这样：

MyProject＆gt; app＆gt;控制器＆gt; api> v1＆gt; users_controller.rb

然后class Api::V1::UsersController

对于首字母缩略词名称API::V1::UsersController而不是Api::V1::Users::UsersController使用inflectors：

config/initializers/inflections.rb

中的

 ActiveSupport::Inflector.inflections(:en) do |inflect|
   inflect.acronym 'API'
 end

在Rails 4中创建API - 未初始化的常量Api :: V1 :: UsersController

1 个答案: