Question

我的Rails 4应用程序遇到了一些异常行为。每次我点击我的视图中的link_to，我的控制器动作被调用两次。例如：

在我的root_url我有users_profile的标准电话：

<%= link_to('User Profile', users_profile_path, :class => "logout-button") %>

当我点击此链接时，我的控制台显示以下输出：

Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:45:53 -0200
Processing by Users::SessionsController#profile as HTML
  User Load (0.7ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
  InvestorProfile Load (0.5ms)  SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  EmployeeProfile Load (0.5ms)  SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  Rendered users/sessions/_investor_setup.html.erb (3.9ms)
  Rendered users/sessions/profile.html.erb within layouts/application (5.2ms)
Completed 200 OK in 19ms (Views: 11.2ms | ActiveRecord: 2.5ms)


Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:45:53 -0200
Processing by Users::SessionsController#profile as HTML
  User Load (0.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
  InvestorProfile Load (0.3ms)  SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  EmployeeProfile Load (0.2ms)  SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  Rendered users/sessions/_investor_setup.html.erb (3.3ms)
  Rendered users/sessions/profile.html.erb within layouts/application (4.1ms)
Completed 200 OK in 12ms (Views: 7.5ms | ActiveRecord: 1.2ms)

当有一个远程（例如JS）调用该方法时，人们经常会有这种行为，但这不是我的情况。最奇怪的部分是，如果我将直接URL放在浏览器上的users_profile_path上。我只在rails控制台上收到一个请求：

Started GET "/users/profile" for 127.0.0.1 at 2013-11-25 20:48:17 -0200
Processing by Users::SessionsController#profile as HTML
  User Load (0.3ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 45 ORDER BY "users"."id" ASC LIMIT 1
  InvestorProfile Load (0.3ms)  SELECT "investor_profiles".* FROM "investor_profiles" WHERE "investor_profiles"."user_id" = $1 ORDER BY "investor_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  EmployeeProfile Load (0.2ms)  SELECT "employee_profiles".* FROM "employee_profiles" WHERE "employee_profiles"."user_id" = $1 ORDER BY "employee_profiles"."id" ASC LIMIT 1  [["user_id", 45]]
  Rendered users/sessions/_investor_setup.html.erb (3.4ms)
  Rendered users/sessions/profile.html.erb within layouts/application (4.2ms)
Completed 200 OK in 12ms (Views: 7.7ms | ActiveRecord: 1.1ms)

我的应用程序中的每个链接都得到了相同的结果，而不仅仅是这个。

Answer 1

如果您希望您的应用仍然使用Turbolinks，那么“Opting out of Turbolinks”代码会给您带来问题的方法;只需添加data-no-turbolink。

我在使用Bootstrap 3时遇到了问题并添加了修复它的问题。例如;

<li class="list-group-item" data-no-turbolink>
  <%= link_to download_path(item) do %>
    <button type="button" class="btn btn-success">Download</button>
  <% end %>
</li>

Answer 2

我实际上设法自己解决这个问题。有一个使用rails 4.0安装的默认gem，它被称为Turbolinks*。

出于某种原因，这个gem *中使用的javascript导致我的服务器上的加倍请求。这就是为什么只有GET请求表现得像这样，并且POST请求是正常的。我仍然不完全理解为什么gem *会导致这种情况，但是在我从application.js文件中删除了以下行后，双重请求停止了。

=// require turbolinks

Answer 3

另一种解决方案是将data-no-turbolink添加到代码中。

此处有更多信息：http://blog.flightswithfriends.com/post/53943440505/how-to-disable-turbolinks-in-rails-4

Answer 4

我在 Rails 5 中也遇到了相同的问题，这是我的机器详细信息-

$ rails -v
Rails 5.2.2
$ ruby -v
ruby 2.6.1p33

每当我单击链接时，整个控制器就会被调用两次。
我尝试了接受的答案，但对我无效，
所以我只将turbolinks: false设置为以下-

Link is: <%= link_to("Demo link", "/abc/pqr/#{current_user.id}", data: { turbolinks: false } ) %>

这对我有用，谢谢上面的提示！

我的rails 4应用程序上的每个link_to都被调用两次

4 个答案: