Copy user's avatar from one s3 bucket to anothers user's avatar which should be in another s3 bucket?

[ssaha777]

Hi,
I am trying to copy users and their associated avatar. Avatars must be copied to a different bucket.
What I am trying to do is that

def with_temporary_s3_bucket
      begin
        CarrierWave.configure do |config|
          config.aws_bucket = 'COPY-TO-BUCKET'
        end
        yield
      ensure
        CarrierWave.configure do |config|
          config.aws_bucket = 'COPY-FROM-BUCKET'
        end
      end
    end

file = parent_user.avatar.file

with_temporary_s3_bucket do
  dup_user.avatar = file
end

but this is not uploading any image to 'COPY-TO-BUCKET'

Any help would be appreciated.