Question

在我的rails应用程序中，我有一个链接，以便用户可以在网站上下载GIF：

<%= link_to "gif", :controller => "projects", :action => :export_gif, :id => @project.id %>

这是相应的控制器操作：

def export_gif
    if @project.gif.blank?
      @project.generate_gif #this creates @project.gif
    end

    gif_path = @project.gif.gif_file_url
    gif_path.sub! 'https', 'http'
    send_data open(gif_path).read, filename: "project_#{@project.id}.gif", type: "image/gif"
  end

当用户点击链接时，将调用export_gif操作两次。我如何确保只调用一次？

点击链接后，这里的日志是什么样的：

Started GET "/projects/38/export_gif" for ::1 at 2015-06-16 17:08:55 -0400
Processing by ProjectsController#export_gif as HTML
  Parameters: {"id"=>"38"}
  Project Load (0.1ms)  SELECT  "projects".* FROM "projects" WHERE "projects"."id" = ? LIMIT 1  [["id", 38]]
  Gif Load (0.1ms)  SELECT  "gifs".* FROM "gifs" WHERE "gifs"."project_id" = ? LIMIT 1  [["project_id", 38]]
  Rendered text template (0.0ms)
Sent data project_38.gif (3.6ms)
Completed 200 OK in 207ms (Views: 3.4ms | ActiveRecord: 0.2ms)


Started GET "/projects/38/export_gif" for ::1 at 2015-06-16 17:08:55 -0400
Processing by ProjectsController#export_gif as HTML
  Parameters: {"id"=>"38"}
  Project Load (0.1ms)  SELECT  "projects".* FROM "projects" WHERE "projects"."id" = ? LIMIT 1  [["id", 38]]
  Gif Load (0.1ms)  SELECT  "gifs".* FROM "gifs" WHERE "gifs"."project_id" = ? LIMIT 1  [["project_id", 38]]
  Rendered text template (0.0ms)
Sent data project_38.gif (0.6ms)
Completed 200 OK in 196ms (Views: 0.5ms | ActiveRecord: 0.1ms)

Answer 1

对我来说，这是因为<img src="#">。我在其中一个布局文件中有这个所以我改变了＃34;＃＆＃34;用＆＃34; http://example.com＆＃34;问题得到解决。

我从这里得到了这个解决方案（aNoble的回答）：
Rails seems to be serving the page twice

Rails控制器动作被调用两次

1 个答案: