Rails - Aug 2009 - Mysql::Error: Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE)

Hi, I''ve got an error when I upload a record by iPhone with Chinese  
character.


Processing ScoresController#create (for 123.204.56.133 at 2009-08-04  
16:19:52) [POST]
   Parameters: {"score"=>{"score"=>"79.60",
"player_name"=>"一",
"iphone_identifier"=>"6b194f783d645ba1a7c30c0e31b1b67300eb0a25"},
"product_id"=>"7"}
   ^[[4;35;1mSQL (0.1ms)^[[0m   ^[[0mSET collation_database =  
''utf8_general_ci'' ^[[0m
   ^[[4;36;1mSQL (0.1ms)^[[0m   ^[[0;1mSET collation_connection =  
''utf8_general_ci'' ^[[0m
7--- !map:HashWithIndifferentAccess
score: "79.60"
player_name: !binary |
   5LiA

iphone_identifier: 6b194f783d645ba1a7c30c0e31b1b67300eb0a25
   ^[[4;35;1mSQL (0.2ms)^[[0m   ^[[0mSHOW VARIABLES LIKE  
''collation_database''^[[0m
Collation: utf8_general_ci
   ^[[4;36;1mScore Load (0.0ms)^[[0m   ^[[0;1mMysql::Error: Illegal  
mix of collations (latin1_swedish_ci,IMPLICIT) and  
(utf8_general_ci,COERCIBLE) for operation ''='': SELECT * FROM
  `scores` WHERE (`scores`.`product_id` = ''7'' AND  
`scores`.`iphone_identifier` =  
''6b194f783d645ba1a7c30c0e31b1b67300eb0a25'' AND
`scores`.`player_name`
= ''一'') LIMIT 1^[[0m

ActiveRecord::StatementInvalid (Mysql::Error: Illegal mix of  
collations (latin1_swedish_ci,IMPLICIT) and  
(utf8_general_ci,COERCIBLE) for operation ''='': SELECT * FROM
`scores`
WHE
RE (`scores`.`product_id` = ''7'' AND
`scores`.`iphone_identifier` =
''6b194f783d645ba1a7c30c0e31b1b67300eb0a25'' AND
`scores`.`player_name`
= ''一'')  LIMIT 1):
   app/controllers/scores_controller.rb:59:in `create''


Any ideas?
Thank you.


HeChian Hsu
hechianhsu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org