Rails 4和paperclip - 停止：原始样式文件上传，从S3远程目录复制它 [英] Rails 4 and paperclip - Stop the :original style file upload to copy it from an S3 remote directory

问题描述

我使用Paperclip 4.0.2和我的应用程式上传图片。

I use Paperclip 4.0.2 and in my app to upload pictures.

因此我的文件模型有一个attached_file 附件

So my Document model has an attached_file called attachment

附件有几种样式，例如：medium，：thumb：：facebook

The attachment has few styles, say :medium, :thumb, :facebook

在我的模型中，我停止样式处理，并且在后台作业中提取它。

In my model, I stop the styles processing, and I extracted it inside a background job.

class Document < ActiveRecord::Base
# stop paperclip styles generation    
before_post_process
  false
end

但原始样式文件仍上传！

$ b b

我想知道是否可以停止此行为并将文件复制到远程目录中的：original / filename.jpg
我的目标是使用已在S3中上传的文件/ temp /目录下，并将其复制到Paperclip需要它来生成其他样式的目录。

I would like to know if it's possible to stop this behavior and copy the file inside the :original/filename.jpg from a remote directory My goal being to use a file that has been uploaded in a S3 /temp/ directory with jQuery File upload, and copy it to the directory where Paperclip needs it to generate the others styles.

先谢谢你的帮助！ p>

Thank you in advance for your help!

推荐答案

新答案：

获得上传到 flush_writes 方法，为了您的目的，它是 Paperclip :: Storage :: S3 模块。负责上传的行是：

paperclip attachments get uploaded in the flush_writes method which, for your purposes, is part of the Paperclip::Storage::S3 module. The line which is responsible for the uploading is:

s3_object(style).write(file, write_options)

因此，通过monkey_patch，您可以将其更改为：

So, by means of monkey_patch, you can change this to something like:

s3_object(style).write(file, write_options) unless style.to_s == "original" and @queued_for_write[:your_processed_style].present?

编辑： 创建以下文件： config / initializers / decorators / paperclip.rb

Paperclip::Storage::S3.class_eval do
  def flush_writes #:nodoc:
    @queued_for_write.each do |style, file|
    retries = 0
      begin
        log("saving #{path(style)}")
        acl = @s3_permissions[style] || @s3_permissions[:default]
        acl = acl.call(self, style) if acl.respond_to?(:call)
        write_options = {
          :content_type => file.content_type,
          :acl => acl
        }

        # add storage class for this style if defined
        storage_class = s3_storage_class(style)
        write_options.merge!(:storage_class => storage_class) if storage_class

        if @s3_server_side_encryption
          write_options[:server_side_encryption] = @s3_server_side_encryption
        end

        style_specific_options = styles[style]

        if style_specific_options
          merge_s3_headers( style_specific_options[:s3_headers], @s3_headers, @s3_metadata) if style_specific_options[:s3_headers]
          @s3_metadata.merge!(style_specific_options[:s3_metadata]) if style_specific_options[:s3_metadata]
        end

        write_options[:metadata] = @s3_metadata unless @s3_metadata.empty?
        write_options.merge!(@s3_headers)

        s3_object(style).write(file, write_options) unless style.to_s == "original" and @queued_for_write[:your_processed_style].present?
      rescue AWS::S3::Errors::NoSuchBucket
        create_bucket
        retry
      rescue AWS::S3::Errors::SlowDown
        retries += 1
        if retries <= 5
          sleep((2 ** retries) * 0.5)
          retry
        else
          raise
        end
      ensure
        file.rewind
      end
    end
    after_flush_writes # allows attachment to clean up temp files
    @queued_for_write = {}
  end
end

现在原始文件未上传。如果您希望将原件直接上传到s3，请将原件转移到相应的最终位置，然后在您的模型中添加一些行，如下面我的origninal答案。

now the original does not get uploaded. You could then add some lines, like those of my origninal answer below, to your model if you wish to transfer the original to its appropriate final location if it was uploaded to s3 directly.

原始答案：

或许类似这样放置在使用after_create回调执行的模型中：

perhaps something like this placed in your model executed with the after_create callback:

    paperclip_file_path = "relative/final/destination/file.jpg"
    s3.buckets[BUCKET_NAME].objects[paperclip_file_path].copy_from(relative/temp/location/file.jpg)

感谢 https://github.com/uberllama

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