Couldn't you just add a :before_destroy filter to User?
class User < ActiveRecord::Base
before_destroy :unlink_comments
def unlink_comments
comments.each do |comment|
comment.author_name = comment.user.login
comment.author_email = comment.user.email
comment.user_id = nil
comment.save
end
end
end
(Note: haven't tried this code myself)
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