Rails Controller Action被两次调用

Question

In my rails app, I have a link so that a user can download a GIF on the site:

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

This is the corresponding controller action:

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

When the user clicks on the link, the export_gif action is being called twice. How do I ensure that it only gets called once?

Here's what the logs look like after I click the link:

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

For me it was because of <img src="#"> . I had this in one of the files of layouts.
So I changed "#" with " http://example.com " and issue got resolved.

I got this solution from here(aNoble's answer):
Rails seems to be serving the page twice