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# File 'activestorage/lib/active_storage/service/s3_service.rb', line 100
def compose(source_keys, destination_key, filename: nil, content_type: nil, disposition: nil, custom_metadata: {})
content_disposition = content_disposition_with(type: disposition, filename: filename) if disposition && filename
object_for(destination_key).upload_stream(
content_type: content_type,
content_disposition: content_disposition,
part_size: MINIMUM_UPLOAD_PART_SIZE,
metadata: custom_metadata,
**upload_options
) do |out|
source_keys.each do |source_key|
stream(source_key) do |chunk|
IO.copy_stream(StringIO.new(chunk), out)
end
end
end
end
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