Rails form_for 删除答案

【问题标题】：Rails form_for deleteRails form_for 删除
【发布时间】：2016-04-20 18:34:45
【问题描述】：

我已经构建了一个 Rails 5 RESTful API，并且我一直在开发一个用于测试接口的消费者应用程序。 CRUD 的 CR 效果很好，但我坚持删除。两个应用程序都在本地运行。

我想打电话：DELETE /users/:user_id/attendees/:id(.:format) attendees#destroy 来自我的外部消费者应用程序。理想情况下，这将通过直接调用 API 的传统 Rails 视图助手来完成，并且不需要自定义 JavaScript 或将 API（或其资源）包装在消费者应用程序中。

我让它在 JavaScript 中工作：

$("#button").click(function(){
  resource_id = $("#button").data('resource-id');
  $.ajax({
    type: "DELETE",
    url: "http://localhost:3001/users/1/attendees/" + resource_id + "?user_email=EMAIL&user_token=TOKEN&",
    dataType: "json",
    data: {"_method":"delete"},
    complete: function(){
      alert("Deleted successfully");
  }
  });
});

我想要的是：
= link_to "Delete", "http://localhost:3001/users/1/attendees/THE_RESOURCE_ID?user_email=EMAIL&user_token=TOKEN&", method: :delete
呈现此 HTML：
<a rel="nofollow" data-method="delete" href="http://localhost:3001/users/1/attendees/THE_RESOURCE_ID?user_email=EMAIL&amp;user_token=TOKEN&amp;">Delete</a>

这不起作用：

{
  "status":404,
  "error":"Not Found",
  "exception":"#\u003cActionController::RoutingError: No route matches [POST] \"/users/1/attendees/2\"\u003e",
  "traces":{
    "Application Trace":[],
    "Framework Trace":
      [{"id":0,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'"},
      {"id":1,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'"},
      {"id":2,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:36:in `call_app'"},
      {"id":3,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:24:in `block in call'"},
      {"id":4,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:70:in `block in tagged'"},
      {"id":5,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:26:in `tagged'"},
      {"id":6,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:70:in `tagged'"},
      {"id":7,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:24:in `call'"},
      {"id":8,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/request_id.rb:24:in `call'"},
      {"id":9,"trace":"rack (2.0.0.alpha) lib/rack/runtime.rb:22:in `call'"},
      {"id":10,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'"},
      {"id":11,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/executor.rb:12:in `call'"},
      {"id":12,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/static.rb:136:in `call'"},
      {"id":13,"trace":"rack (2.0.0.alpha) lib/rack/sendfile.rb:111:in `call'"},
      {"id":14,"trace":"rack-cors (0.4.0) lib/rack/cors.rb:80:in `call'"},
      {"id":15,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/engine.rb:522:in `call'"},
      {"id":16,"trace":"puma (3.2.0) lib/puma/configuration.rb:227:in `call'"},
      {"id":17,"trace":"puma (3.2.0) lib/puma/server.rb:561:in `handle_request'"},
      {"id":18,"trace":"puma (3.2.0) lib/puma/server.rb:406:in `process_client'"},
      {"id":19,"trace":"puma (3.2.0) lib/puma/server.rb:271:in `block in run'"},
      {"id":20,"trace":"puma (3.2.0) lib/puma/thread_pool.rb:111:in `call'"},
      {"id":21,"trace":"puma (3.2.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread'"}],
    "Full Trace":[{"id":0,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb:53:in `call'"},
      {"id":1,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'"},
      {"id":2,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:36:in `call_app'"},
      {"id":3,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:24:in `block in call'"},
      {"id":4,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:70:in `block in tagged'"},
      {"id":5,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:26:in `tagged'"},
      {"id":6,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/tagged_logging.rb:70:in `tagged'"},
      {"id":7,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/rack/logger.rb:24:in `call'"},
      {"id":8,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/request_id.rb:24:in `call'"},
      {"id":9,"trace":"rack (2.0.0.alpha) lib/rack/runtime.rb:22:in `call'"},
      {"id":10,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/activesupport/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'"},
      {"id":11,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/executor.rb:12:in `call'"},
      {"id":12,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/actionpack/lib/action_dispatch/middleware/static.rb:136:in `call'"},
      {"id":13,"trace":"rack (2.0.0.alpha) lib/rack/sendfile.rb:111:in `call'"},
      {"id":14,"trace":"rack-cors (0.4.0) lib/rack/cors.rb:80:in `call'"},
      {"id":15,"trace":"/Users/MYUSER/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/bundler/gems/rails-7b82e1c77b48/railties/lib/rails/engine.rb:522:in `call'"},
      {"id":16,"trace":"puma (3.2.0) lib/puma/configuration.rb:227:in `call'"},
      {"id":17,"trace":"puma (3.2.0) lib/puma/server.rb:561:in `handle_request'"},
      {"id":18,"trace":"puma (3.2.0) lib/puma/server.rb:406:in `process_client'"},
      {"id":19,"trace":"puma (3.2.0) lib/puma/server.rb:271:in `block in run'"},
      {"id":20,"trace":"puma (3.2.0) lib/puma/thread_pool.rb:111:in `call'"},
      {"id":21,"trace":"puma (3.2.0) lib/puma/thread_pool.rb:111:in `block in spawn_thread'"}]}}

我已经安装了 rack-cors gem 并且可以正常工作。

（我意识到还有其他重构工作要做，但我认为我知道如何解决这些问题。:-)）

感谢您的帮助！

以下是 API 的相关现有路由：

  user_attendees GET    /users/:user_id/attendees(.:format)     attendees#index
                 POST   /users/:user_id/attendees(.:format)     attendees#create
   user_attendee GET    /users/:user_id/attendees/:id(.:format) attendees#show
                 PATCH  /users/:user_id/attendees/:id(.:format) attendees#update
                 PUT    /users/:user_id/attendees/:id(.:format) attendees#update
                 DELETE /users/:user_id/attendees/:id(.:format) attendees#destroy

【问题讨论】：

这个外部消费者应用程序，它是一个网络浏览器吗？或者别的什么
错误是什么？您的 link_to 看起来正确。
@Doon 是的，它是另一个可供浏览器访问的 Rails 应用程序。它有一个用于创建的表单和一个用于查看的链接，现在我正在尝试找到一种简单的删除方法。
@CarsonCole，哎呀，应该包括那个，添加。
它看起来仍然正确。你能包括更多的错误...

标签： ruby-on-rails ruby ruby-on-rails-5

【解决方案1】：

叹息...

我错过了 remote: true。

= link_to "Delete", "http://localhost:3001/users/1/attendees/THE_RESOURCE_ID?user_email=EMAIL&user_token=TOKEN&", method: :delete, remote: true

对于任何感兴趣的人，这是我启用 CORS 的方式：http://sourcey.com/building-the-prefect-rails-5-api-only-app/#enabling-cors。这是提醒我使用remote: true:Simple example of Rails 3 + UJS using Ajax to make a remote call, and rendering the resulting JSON object的SO帖子。

【讨论】：