在 Javascript 中执行 ruby​​ 方法 - Ruby on Rails App

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【中文标题】在 Javascript 中执行 ruby​​ 方法 - Ruby on Rails App【英文标题】：Execute ruby method within Javascript - Ruby on Rails App 【发布时间】：2016-12-05 23:24:57 【问题描述】：

在 JWPlayer 上观看完视频后，我想在 UsersController 中执行一个 ruby​​ 方法来更新用户模型属性

我不确定我做错了什么。

主页.html.erb

<script src="//content.jwplatform.com/players/<%= a = Video.mediakey(Time.now.strftime("%Y%m%d").to_i) %>-3sPMNLmx.js"></script>
<script>
jwplayer().on('complete', function() 
  $.ajax("/users/increase_workouts")
);
</script>

用户控制器

# Adds video to number of workouts
    def increase_workouts
      if logged_in?
        current_user.workouts += 1
      else
        redirect_to login_url
      end
    end

Routes.rb

Rails.application.routes.draw 做

  get 'password_resets/new'

  get 'password_resets/edit'

  get 'sessions/new'

  get 'users/new'

  get 'videos/new'

  get 'videos/index'

  root "static_pages#home"

  get 'static_pages/about'

  get 'static_pages/contact'

  get 'static_pages/help'

  get 'signup'  => 'users#new'

  get  'upload' => 'videos#new'

  get    'login'   => 'sessions#new'
  post   'login'   => 'sessions#create'
  delete 'logout'  => 'sessions#destroy'

  resources :users do
  get :increase_workouts, on: :collection 
  end
  resources :videos
  resources :account_activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
end

一切似乎都在工作，但它要求模板......我不想要模板，我希望它增加 current_user.workouts 1。 这是我从服务器日志中得到的...

ActionView::MissingTemplate（缺少模板用户/increase_workouts， 使用 :locale=>[:en], :formats=>[:html, :text, :js, :css, :ics, :csv, :vcf, :png, :jpeg, :gif, :bmp, :tiff, :mpeg, :xml, :rss, :atom, :yaml, :multipart_form, :url_encoded_form, :json, :pdf, :zip], :variants=>[], :handlers=>[:erb, :builder, :raw, :ruby, :coffee, :jbuilder]。搜索：* “/usr/local/rvm/gems/ruby-2.3.0/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates” * "/home/ubuntu/workspace/app/views" * "/usr/local/rvm/gems/ruby-2.3.0/gems/web-console-2.0.0.beta3/app/views" ): actionview (4.2.2) lib/action_view/path_set.rb:46:in find' actionview (4.2.2) lib/action_view/lookup_context.rb:121:infind' actionview (4.2.2) lib/action_view/renderer/abstract_renderer.rb:18:in find_template' actionview (4.2.2) lib/action_view/renderer/template_renderer.rb:40:in determine_template' actionview (4.2.2) lib/action_view/renderer/template_renderer.rb:8:in render' actionview (4.2.2) lib/action_view/renderer/renderer.rb:42:in render_template' actionview (4.2.2) lib/action_view/renderer/renderer.rb:23:in render' actionview (4.2.2) lib/action_view/rendering.rb:100:in_render_template' actionpack (4.2.2) lib/action_controller/metal/streaming.rb:217:in _render_template' actionview (4.2.2) lib/action_view/rendering.rb:83:inrender_to_body' 动作包 (4.2.2) lib/action_controller/metal/rendering.rb:32:in render_to_body' actionpack (4.2.2) lib/action_controller/metal/renderers.rb:37:inrender_to_body' actionpack (4.2.2) lib/abstract_controller/rendering.rb:25:in render' actionpack (4.2.2) lib/action_controller/metal/rendering.rb:16:in render' actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:44:in block (2 levels) in render' activesupport (4.2.2) lib/active_support/core_ext/benchmark.rb:12:inblock in ms' /usr/local/rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/benchmark.rb:308:in realtime' activesupport (4.2.2) lib/active_support/core_ext/benchmark.rb:12:inms' 动作包 (4.2.2) lib/action_controller/metal/instrumentation.rb:44:in block in render' actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:87:in cleanup_view_runtime' activerecord (4.2.2) lib/active_record/railties/controller_runtime.rb:25:in cleanup_view_runtime' actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:43:inrender' 动作包（4.2.2） lib/action_controller/metal/implicit_render.rb:10:in default_render' actionpack (4.2.2) lib/action_controller/metal/implicit_render.rb:5:in send_action' actionpack (4.2.2) lib/abstract_controller/base.rb:198:in process_action' actionpack (4.2.2) lib/action_controller/metal/rendering.rb:10:in process_action' actionpack (4.2.2) lib/abstract_controller/callbacks.rb:20:in block in process_action' activesupport (4.2.2) lib/active_support/callbacks.rb:117:incall' activesupport (4.2.2) lib/active_support/callbacks.rb:555:in block (2 levels) in compile' activesupport (4.2.2) lib/active_support/callbacks.rb:505:incall' activesupport (4.2.2) lib/active_support/callbacks.rb:92:in _run_callbacks' activesupport (4.2.2) lib/active_support/callbacks.rb:776:in _run_process_action_callbacks' activesupport (4.2.2) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (4.2.2) lib/abstract_controller/callbacks.rb:19:inprocess_action' actionpack (4.2.2) lib/action_controller/metal/rescue.rb:29:in process_action' actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:32:inblock in process_action' 主动支持 (4.2.2) lib/active_support/notifications.rb:164:in block in instrument' activesupport (4.2.2) lib/active_support/notifications/instrumenter.rb:20:ininstrument' activesupport (4.2.2) lib/active_support/notifications.rb:164:in instrument' actionpack (4.2.2) lib/action_controller/metal/instrumentation.rb:30:inprocess_action' 动作包（4.2.2） lib/action_controller/metal/params_wrapper.rb:250:in process_action' activerecord (4.2.2) lib/active_record/railties/controller_runtime.rb:18:in process_action' actionpack (4.2.2) lib/abstract_controller/base.rb:137:in process' actionview (4.2.2) lib/action_view/rendering.rb:30:inprocess' actionpack (4.2.2) lib/action_controller/metal.rb:196:in dispatch' actionpack (4.2.2) lib/action_controller/metal/rack_delegation.rb:13:indispatch' actionpack (4.2.2) lib/action_controller/metal.rb:237:in block in action' actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:74:indispatch' actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:43:in serve' actionpack (4.2.2) lib/action_dispatch/journey/router.rb:43:inblock 在服务'动作包（4.2.2） lib/action_dispatch/journey/router.rb:30:in each' actionpack (4.2.2) lib/action_dispatch/journey/router.rb:30:inserve' actionpack (4.2.2) lib/action_dispatch/routing/route_set.rb:819:in call' rack (1.6.4) lib/rack/etag.rb:24:incall' 机架 (1.6.4) lib/rack/conditionalget.rb:25:in call' rack (1.6.4) lib/rack/head.rb:13:incall' actionpack (4.2.2) lib/action_dispatch/middleware/params_parser.rb:27:in call' actionpack (4.2.2) lib/action_dispatch/middleware/flash.rb:260:in call' 机架 (1.6.4) lib/rack/session/abstract/id.rb:225:in context' rack (1.6.4) lib/rack/session/abstract/id.rb:220:incall' actionpack (4.2.2) lib/action_dispatch/middleware/cookies.rb:560:in call' activerecord (4.2.2) lib/active_record/query_cache.rb:36:in call'活动记录（4.2.2） lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in call' activerecord (4.2.2) lib/active_record/migration.rb:378:in call' 动作包 (4.2.2) lib/action_dispatch/middleware/callbacks.rb:29:in block in call' activesupport (4.2.2) lib/active_support/callbacks.rb:88:in _run_callbacks' activesupport (4.2.2) lib/active_support/callbacks.rb:776:in _run_call_callbacks' activesupport (4.2.2) lib/active_support/callbacks.rb:81:in run_callbacks' actionpack (4.2.2) lib/action_dispatch/middleware/callbacks.rb:27:in call' actionpack (4.2.2) lib/action_dispatch/middleware/reloader.rb:73:incall' actionpack (4.2.2) lib/action_dispatch/middleware/remote_ip.rb:78:in call' web-console (2.0.0.beta3) lib/action_dispatch/debug_exceptions.rb:18:inmiddleware_call' 网络控制台 (2.0.0.beta3) lib/action_dispatch/debug_exceptions.rb:13:in call' actionpack (4.2.2) lib/action_dispatch/middleware/show_exceptions.rb:30:incall' railties (4.2.2) lib/rails/rack/logger.rb:38:in call_app' railties (4.2.2) lib/rails/rack/logger.rb:20:inblock in call' activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in block in tagged' activesupport (4.2.2) lib/active_support/tagged_logging.rb:26:in tagged' activesupport (4.2.2) lib/active_support/tagged_logging.rb:68:in tagged' railties (4.2.2) lib/rails/rack/logger.rb:20:incall' actionpack (4.2.2) lib/action_dispatch/middleware/request_id.rb:21:in call' rack (1.6.4) lib/rack/methodoverride.rb:22:incall' 机架 (1.6.4) lib/rack/runtime.rb:18:in call' activesupport (4.2.2) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in call' 机架 (1.6.4) lib/rack/lock.rb:17:in call' actionpack (4.2.2) lib/action_dispatch/middleware/static.rb:113:incall' 机架 (1.6.4) lib/rack/sendfile.rb:113:in call' railties (4.2.2) lib/rails/engine.rb:518:incall' railties (4.2.2) lib/rails/application.rb:164:in call' rack (1.6.4) lib/rack/content_length.rb:15:incall' puma (3.1.0) lib/puma/configuration.rb:227:in call' puma (3.1.0) lib/puma/server.rb:561:inhandle_request' puma (3.1.0) lib/puma/server.rb:406:in process_client' puma (3.1.0) lib/puma/server.rb:271:inblock in run' puma (3.1.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread'

渲染 /usr/local/rvm/gems/ruby-2.3.0/gems/web-console-2.0.0.beta3/lib/action_dispatch/templates/rescues/missing_template.text.erb (1.3 毫秒)

【问题讨论】：

这里没有足够的信息来真正回答这个问题，但您可以开始检查您的“完成”回调是否正在运行。只需在您的 ajax 请求之前粘贴 console.log("complete callback"); 即可。您可以通过.success 和.failure 回调检查响应（请参阅api.jquery.com/jquery.ajax）并查看rails 开发日志以查看您的请求是否正在发送。 您还想查看哪些其他类型的信息？ 我知道“完成”回调正在运行，因为我设置了 alert("Hi!");在 ajax 之前，它工作得很好。 【参考方案1】：

了解您期望它做什么以及它实际在做什么会有所帮助。

日志告诉我们发生了异常：ActionView::MissingTemplate。 “缺少模板users/increase_workouts, application/increase_workouts”消息告诉您有关缺少的视图模板的一些重要信息，它为您提供了它期望找到模板的位置。

当您通过发送请求与控制器操作交谈时，它需要知道如何响应您的请求。按照惯例，Rails 会渲染一个与动作同名的模板，例如index.html.erb 或index.jbuilder，但在您的特殊操作的情况下，您要么需要创建响应模板，要么告诉控制器要render。

在你在控制器动作中添加一个到锻炼之后，这样的事情应该会给你一个“成功”的响应。

render(json: message: "Workouts increased" , status: :ok) and return

但您也可以只使用render(status: :ok) and return。这里的:ok 是一种人性化的方式来指示 HTTP 状态代码 200，您的客户端（您页面上的 JS）需要在响应中看到它。

更多详情请见http://guides.rubyonrails.org/layouts_and_rendering.html#using-render

【讨论】：

我这样做了，它摆脱了缺失的模板。但它不会为锻炼增加 1。我不确定为什么会这样。这不是调用 #increase_workouts 方法吗？如果它在 current_user.workouts 中加 1，那不应该有效吗？ 它在日志 Started GET "/users/increase_workouts" for 12.216.140.50 at 2016-08-01 17:32:19 +0000 Processing by UsersController#increase_workouts as / 用户负载 (0.4ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 1]] 3ms 内完成 200 OK (Views: 0.2ms | ActiveRecord: 0.4ms) 想通了。我需要 .save 用户。 干得好！另请参阅 ActiveRecord 的 update_attribute。 ?

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