Question

我有一个利用主动辅导的模式:

class Package < ApplicationRecord
  has_one_attached :poster_image
end

我如何制作包裹物体的复印件,其中含有初始海报——image文档的重复。大致如下:

original = Package.first
copy = original.dup
copy.poster_image.attach = original.poster_image.copy_of_file

Answer 1

1. 更新你的模型:

class Package < ApplicationRecord
  has_one_attached :poster_image
end

附上该资料袋的海报图像布,以列入目的地一揽子计划:

source_package.dup.tap do |destination_package|
  destination_package.poster_image.attach(source_package.poster_image.blob)
end

Answer 2

如果您希望填满copy,以便原始记录和。彩色记录本身有所附档案副本:

Inrails 5.2, grab ,该代码,并将其载于config/ initializers/active_storage.rb ,然后使用该代码复制件:

ActiveStorage::Downloader.new(original.poster_image).download_blob_to_tempfile do |tempfile|
  copy.poster_image.attach({
    io: tempfile, 
    filename: original.poster_image.blob.filename, 
    content_type: original.poster_image.blob.content_type 
  })
end

在铁路站5.2号(每次放电时包括)。

original.poster_image.blob.open do |tempfile|
  copy.poster_image.attach({
    io: tempfile, 
    filename: original.poster_image.blob.filename, 
    content_type: original.poster_image.blob.content_type 
  })
end

Thanks, George, for your original answer and for your Rails contributions. :)

Answer 3

找到答案,通过铁路检查,特别是中

So for this case

class Package < ApplicationRecord
  has_one_attached :poster_image
end

你可以重复附文本身。

original = Package.first
copy = original.dup
copy.poster_image.attach 
  :io           => StringIO.new(original.poster_image.download),
  :filename     => original.poster_image.filename,
  :content_type => original.poster_image.content_type

同一方法与<条码>has_many_attachments有关。

class Post < ApplicationRecord
  has_many_attached :images
end

original = Post.first
copy = original.dup

original.images.each do |image|
  copy.images.attach 
    :io           => StringIO.new(image.download),
    :filename     => image.filename,
    :content_type => image.content_type
end

Answer 4

为我工作:

copy.poster_image.attach(original.poster_image.blob)

Answer 5

铁路5 Jethro swer 运转良好。铁路 6 我必须修改:

  image_io = source_record.image.download
  ct = source_record.image.content_type
  fn = source_record.image.filename.to_s
  ts = Time.now.to_i.to_s

  new_blob = ActiveStorage::Blob.create_and_upload!(
    io: StringIO.new(image_io),
    filename: ts +  _  + fn,
    content_type: ct,
  )

  new_record.image.attach(new_blob)

资料来源:

Answer 6

本杰明的答复略有改动,对我来说的确是有用的。

copy.poster_image.attach({
    io: StringIO.new(original.poster_image.blob.download), 
    filename: original.poster_image.blob.filename, 
    content_type: original.poster_image.blob.content_type 
  })

Answer 7

另一种做法是,我们不必下载和重载文件,如果你<编码>service/code>支持APIC(例如:AWS有,


original_blob = original.poster_image.blob

cloned_blob = ActiveStorage::Blob.create_before_direct_upload!(
  filename: original_blob.filename.to_s,
  byte_size: original_blob.byte_size,
  checksum: original_blob.checksum,
  content_type: original_blob.content_type
)

YourS3CopyService
  .new(bucket: cloned_blob.service.bucket.name)
  .copy(original_blob.key, cloned_blob.key)


class YourS3CopyService < ActiveStorage::Service::S3Service
  def copy(key, new_key)
    client.client.copy_object upload_options.merge(
      copy_source: "#{bucket.name}/#{key}",
      bucket:      bucket.name,
      key:         new_key
    )
  end
end

采用与主动储存一样的办法直接上载,无需下载服务器上的档案。

友情链接