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