“为什么我的Rails控制器中的'download_file'方法被调用了两次，尽管我只有一个'link_to'按钮触发它？我已经尝试禁用turbolinks和回调，但问题仍然存在，每次下载发生时都会删除两个credit。下面是我的'download_file'方法的相关代码和触发它的链接：

#dashboard_controller.rb
def download_file
    puts "download_file method called"
    if current_account.credit < 1
      redirect_to root_path, notice: "You don't have enough credits to download this file."
    else
      puts current_account.credit
      current_account.credit -= 1
      current_account.save
      file = File.open("#{Rails.root}/test_file.zip", "r")
      self.response.headers["Content-Type"] = "application/zip"
      self.response.headers["Content-Disposition"] = "attachment; filename='test_file.zip'"
      self.response_body = file
    end
  end

#routes.rb
get 'download_file', to: 'dashboard#download_file', as: 'download_file'

#dashboard>show.html.erb
<%= link_to "Download", download_file_path, class: "download-button" %>

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