Rails - Jan 2008 - weirdness with model.send(string).build

I''ve got a weird problem which i can work around but want to
understand!
:)

Let''s say that
name = "small_logo"

This works -

@small_logo = @music_service.send("small_logo").build(file_hash)

and this works

@small_logo = @music_service.send("#{name}").build(file_hash)

but this *doesn''t* work

@small_logo = @music_service.send(name).build(file_hash)

and neither does this

@small_logo = @music_service.send(name.to_s).build(file_hash)


In other words, a string is fine but a variable set to a string isn''t,
unless it''s converted to a string inside #{ }.

Can anyone explain this to me?  I don''t know if it''s connected
to the
attachment_fu ''build'' method or if it''s some general
ruby weirdness.

thanks
max
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