ruby-on-rails - 使用 Paperclip 将对象关联到 S3 上预先存在的文件

Question

我已经在 S3 上有一个文件，我想将其关联到 Assets 模型的预先存在的实例。

这是模型:

class Asset < ActiveRecord::Base
  attr_accessible(:attachment_content_type, :attachment_file_name,
                 :attachment_file_size, :attachment_updated_at, :attachment)

  has_attached_file :attachment, {
    storage: :s3,
    s3_credentials: {
      access_key_id: ENV['AWS_ACCESS_KEY_ID'],
      secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
    },
    convert_options: { all: '-auto-orient' },
    url: ':s3_alias_url',
    s3_host_alias: ENV['S3_HOST_ALIAS'],
    path: ":class/:attachment/:id_partition/:style/:filename",
    bucket: ENV['S3_BUCKET_NAME'],
    s3_protocol: 'https'
  }
end

假设路径是 assets/attachments/000/111/file.png ，以及 Asset我想与文件关联的实例是 asset .引用 source ， 我试过了:

options = {
    storage: :s3,
    s3_credentials: {
      access_key_id: ENV['AWS_ACCESS_KEY_ID'],
      secret_access_key: ENV['AWS_SECRET_ACCESS_KEY'],
    },
    convert_options: { all: '-auto-orient' },
    url: ':s3_alias_url',
    s3_host_alias: ENV['S3_HOST_ALIAS'],
    path: "assets/attachments/000/111/file.png",
    bucket: ENV['S3_BUCKET_NAME'],
    s3_protocol: 'https'
  }
# The above is identical to the options given in the model, except for the path

Paperclip::Attachment.new("file.png", asset, options).save

据我所知，这并没有影响 asset以任何方式。我无法设置 asset.attachment.path手动。

关于 SO 的其他问题似乎没有专门解决这个问题。
“paperclip images not saving in the path i've set up ”、“Paperclip and Amazon S3 how to do paths? ”等涉及设置模型，该模型已经运行良好。

任何人都可以提供任何见解？

Answer 1

据我所知，我确实需要将 S3 对象变成 File ，正如@oregontrail256 所建议的那样。我用了 Fog gem 来做到这一点。

s3 = Fog::Storage.new(
        :provider => 'AWS',
        :aws_access_key_id => ENV['AWS_ACCESS_KEY_ID'],
        :aws_secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
      )

directory = s3.directories.get(ENV['S3_BUCKET_NAME'])
fog_file = directory.files.get(path)

file = File.open("temp", "wb")
file.write(fog_file.body)
asset.attachment = file
asset.save
file.close