[Rails] Postgres COPY from STDIN

I have done some googling to try and figure out how I can use COPY
FROM STDIN with rails and have ran into some posts on stackoverflow or
the mailing list but none of them seem to be working with rails 3.2
Does anybody have a working example of using COPY FROM STDIN?

Some things I have tried

https://bitbucket.org/ged/ruby-pg/src/tip/sample/copyfrom.rb
http://blog.edseek.com/archives/2009/04/26/putline-undefined-for-pgconn/

and similar variations. Nothing seems to be working though.

Thanks.

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