cyrillic character escaping problem on RAILS JSON + EXTJS

I have a problem with the escaping of the cyrillic characters in the rails JSON output:

{"success":true,"total":"2","offices":[{"address":"addr","created_at":"2011-06-03T11:55:09Z","description":"desc","id":1,"name":"Office 1","published":true,"updated_at":"2011-06-05T13:48:35Z"},{"address":"\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd","created_at":"2011-06-03T12:32:19Z","description":"\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd","id":2,"name":"\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd 2","published":null,"updated_at":"2011-06-05T13:49:51Z"}]}

They are not properly decoded in EXTJS and result in grid is �������� 2

The page encoding is UTF8. Mysql and Rails configs are set to UTF开发者_运维问答8

Any ideas ?

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Any code? All I see is that your characters already distorted in json output (they're all the same, if you take a closer look - "\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd").