[Rails] rails 3.1 select multiple with serialized data

In my Users model I have

serialize :roles

Letting it default to yml

I enter roles as a text array. e.g.,
u.roles = ["member","scorer"]

It displays as an array

@user.roles.type returns Array

All is fine except if I try to use the select form helper to input the
values with multiple => true

I've tried several version and I can't get the set values to trigger
selected in the options tag.

f.select(:roles, options_for_select(role_options,@user.roles),{},
{:multiple => true, :size => 5})
f.select(:roles, role_options,{},{:multiple => true, :size => 5})

(role_options is a helper method that return an array of valid role
options.

I had this working under 3.0, but using a kludge to put roles into a
json hash.

Steve

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