ruby-on-rails-3 - ActiveAdmin 中的文件下载链接

Question

如何在 ActiveAdmin 中创建文件下载链接以下载上传的文件？

我试过这样的:

action_item :only=> :show do
 link_to('Download file', [@user, :upload_file])
end

Answer 1

action_item 将在任务栏中创建按钮，但它不会创建实际的路由或 Controller 的操作方法。

您可以通过在 user.rb 中创建自定义 member_action 来实现下载功能

# In app/admin/users.rb
action_item only: [:show] do
  link_to('Download File', download_admin_user_path(resource)) if resource.upload_file.present?
end

member_action :download, method: :get do
  user = User.find(params[:id])
  send_file user.upload_file
end

或者，我的偏好是利用 upload_file.rb

中的 RESTful 显示操作

# In app/admin/users.rb
action_item only: [:show] do
  # NOTE: remove period from file extension
  file_ext = resource.upload_file.file_extension.gsub('.', '')
  link_to('Download File', download_admin_upload_file_path(resource.upload_file, format: file_ext)) if resource.upload_file.present?
end

# In app/admin/upload_files.rb
controller do    
  def show
    if params[:format] == 'txt' # example of a known mimetype, e.g. text file
      send_data resource.path, type: 'text/plain'
    elsif params[:format] == resource.file_extension # example of unknown mimetype
      send_file resource.path
    # let ActiveAdmin perform default behavior
    else
      super
    end
  end
end

引用:http://activeadmin.info/docs/8-custom-actions.html