Redmine/db/migrate/20091017213027_add_missing_...

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class AddMissingIndexesToComments < ActiveRecord::Migration
def self.up
add_index :comments, [:commented_id, :commented_type]
add_index :comments, :author_id
end
def self.down
remove_index :comments, :column => [:commented_id, :commented_type]
remove_index :comments, :author_id
end
end