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- class AddUniqueIndexOnTokensValue < ActiveRecord::Migration
- def up
- say_with_time "Adding unique index on tokens, this may take some time..." do
- # Just in case
- duplicates = Token.connection.select_values("SELECT value FROM #{Token.table_name} GROUP BY value HAVING COUNT(id) > 1")
- Token.where(:value => duplicates).delete_all
-
- add_index :tokens, :value, :unique => true, :name => 'tokens_value'
- end
- end
-
- def down
- remove_index :tokens, :name => 'tokens_value'
- end
- end
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