Rails - Jul 2008 - model.sum(:col，:group=>'col1,col2') only return 2 columns?

There are 3 columns in my model
''Bank'':bank_name,money,save_year,and I
want to get the sum money group by bank_name and save_year.
However,Bank.sum(:money,:group=>''bank_name,save_year'') just
returns the
sum money and the save_year column,and
Bank.sum(:money,:group=>''save_year,bank_name'') just returns
the sum
money and the bank_name column!How can I get all of the three
columns?And it''s a rails feature or bug?My db is mysql,and the sql of
rails 2.1 generated returns all of the three columns in mysql query
browser.
Any help will be appreciated!
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