Rails - Aug 2013 - Duplicating a Paperclip attachment without running processors?

I need to duplicate an object that has an attached Paperclip file. This file
(depending on its file-type) may have two to four different styles, with
separate file-processing stages required for each. Some of these involve
transcoding in FFMPEG, so I would really rather not run the processors all over
again, when the various re-coded versions already exist on S3.

The naive thing (which I have done, and works) is simply to create a new object,
open the original file from S3 using open-uri, and run the process over again.
This works, but takes a long time, since some of these movie files are large and
the processing steps to make thumbnails and poster frames are weighty.

Searching for solutions on this, I came across the dup method, and I also saw a
dup method on the Paperclip attachment when I inspected its methods. Before I go
into a lengthy yak-shaving exercise here, can anyone point me to a simpler way
to manage what I am trying to accomplish here? Essentially I want to duplicate a
group of files in place on S3 (yes, I realize you can''t do that without
copying them) but I want to skip all the processing steps and just duplicate the
styles "manually".

Thanks in advance,

Walter

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Replying to my own, since I posted after beer-thirty on Friday.

On Aug 9, 2013, at 5:15 PM, Walter Lee Davis wrote:
> I need to duplicate an object that has an attached Paperclip file. This
file (depending on its file-type) may have two to four different styles, with
separate file-processing stages required for each. Some of these involve
transcoding in FFMPEG, so I would really rather not run the processors all over
again, when the various re-coded versions already exist on S3.
> 
> The naive thing (which I have done, and works) is simply to create a new
object, open the original file from S3 using open-uri, and run the process over
again. This works, but takes a long time, since some of these movie files are
large and the processing steps to make thumbnails and poster frames are weighty.
> 
> Searching for solutions on this, I came across the dup method, and I also
saw a dup method on the Paperclip attachment when I inspected its methods.
Before I go into a lengthy yak-shaving exercise here, can anyone point me to a
simpler way to manage what I am trying to accomplish here? Essentially I want to
duplicate a group of files in place on S3 (yes, I realize you can''t do
that without copying them) but I want to skip all the processing steps and just
duplicate the styles "manually".
Here''s another thing I have found:
http://blog.firsthand.ca/2011/07/ruby-script-to-duplicate-s3-bucket.html which
is to duplicate an entire bucket. I''m not sure of my terminology here,
is a bucket always the outermost container, or is it any level of
"directory" in a named bucket? I''ve been reading the source
of right_aws here:
https://github.com/rightscale/right_aws/blob/master/lib/s3/right_s3.rb and there
is a copy_key method that looks useful, but I am leery of creating a duplicate
Paperclip object without involving Paperclip. Is the relationship between an
attachment and all of its versions merely predicated on the file paths? Is there
any metadata stored elsewhere that I would also need to duplicate?

Thanks,

Walter
> 
> Thanks in advance,
> 
> Walter
> 
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> 
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