OpenProject is the leading open source project management software.
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openproject/db/migrate/20091017213228_add_missing_...

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class AddMissingIndexesToWatchers < ActiveRecord::Migration
def self.up
add_index :watchers, :user_id
add_index :watchers, [:watchable_id, :watchable_type]
end
def self.down
remove_index :watchers, :user_id
remove_index :watchers, :column => [:watchable_id, :watchable_type]
end
end