OpenProject is the leading open source project management software.
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openproject/db/migrate/20100313171051_add_index_on...

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class AddIndexOnIssuesNestedSet < ActiveRecord::Migration
def self.up
add_index :issues, [:root_id, :lft, :rgt]
end
def self.down
remove_index :issues, [:root_id, :lft, :rgt]
end
end