#5210 encoding problem in json format response - Ruby on Rails - rails

My app (using 3.0.0.rc) has 'utf-8' as default encoding, when I use @model.to_json, it return invalid character(\ufffd) for all foreign characters in database (mysql). But @model.to_xml work fine with the same data. BTW, I have confirmed that this problem doesn't exist in 3.0.0.beta3 I had the same problem with mysql and a utf-8 database ruby-1.9.2-rc2 > p = Project.create(:name => 'áéíóú') => #<P

[saiten]

JSONで文字化ける問題