以干净的层次结构导出回形针图像

Question

我正在开发一个即将关闭的 rails 3.2.8 应用程序。

此应用有 post 个模型 has_many 资产。

资产模型采用回形针管理。

class Asset < ActiveRecord::Base
attr_accessible :post_id, :photo
  belongs_to :post                
  has_attached_file :photo, 
                    :styles => {
                      :thumb => '260x260#',
                      :normal => {
                        :geometry => '600x600>',
                      }
                    }
end

我需要登录生产环境和运行将每张照片备份到文件系统中另一个文件夹的命令，如下所示：

~/backup-folder/post-name-foo/post-name-foo-1.png
~/backup-folder/post-name-foo/post-name-foo-2.png
~/backup-folder/post-name-bar/post-name-bar-1.png
~/backup-folder/post-name-bar/post-name-bar-2.png
~/backup-folder/post-name-bar/post-name-bar-3.png
~/backup-folder/post-name-baz/post-name-baz-1.jpg

图片可以是 png 或 jpg 格式，也可以是 JPG（大写），posts 可以有任意数量的附件。

我只需要运行命令一次，如果可能的话，我希望避免对应用程序进行更改（比如安装新的 gem）。

Answer 1

这里是如何使用rake命令备份文件的示例，您可以增强其文件夹备份的逻辑，希望对您有所帮助

在 <root_folder>/lib/task/photo_backup.rake.

中创建一个 rake 文件

task :photo_backup => :environment do
    require 'rubygems'
    require 'rake'

    # file path on production 
    filename = "post-name-foo-1.png"  
    path_to_file = "#{Rails.root.to_s}/images_folder/#{filename}"

    # backup folder on production
    backup_folder_path = "#{Rails.root.to_s}/backup_folder"
    backup_dir = FileUtils.makedirs(backup_folder_path).first

    begin
       f = File.new("#{backup_dir}/#{filename}", "w+")
       data = open(path_to_file).read
       f.write(data)
    rescue Exception => exp
       puts("Error message : #{exp.message}")
    ensure
       f.close unless f == nil
    end
end

从控制台在您的项目根目录中执行以下命令。
```
rake photo_backup
```

Answer 2

我会使用shell cp命令将资产复制到备份目录；这应该比打开和阅读 Ruby:

中的每个资产要快得多

require 'shellwords'

backup_destination = '/home/app/backup_directory'

# create the backup base directory
FileUtils.mkdir_p backup_destination

Post.find_each do |post|
  # change this if you generate your 'nice' post URLs in a different manner
  post_name       = post.to_param
  post_backup_dir = File.join(backup_destination, post_name)

  FileUtils.mkdir_p post_backup_dir

  post.assets.each_with_index do |asset, index|
    file_extension = File.extname(asset.photo_file_name)
    new_file_name  = "#{post_name}-#{index}#{file_extension}"

    # escape spaces in paths
    source_path = Shellwords.shellescape asset.photo.path(:original)
    target_path = Shellwords.shellescape File.join(post_backup_dir, new_file_name)

    output = `cp #{source_path} #{target_path} 2>&1`

    # make sure cp worked correctly
    unless $?.exitstatus == 0
      puts "WARNING: failed to copy asset #{asset.id} from #{source_path} to #{target_path}: #{output}"
    end
  end
end

以干净的层次结构导出回形针图像

Export paperclip images in a clean hierarchy

ruby-on-rails

ruby

ruby-on-rails-3

paperclip

backup