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1 | class AddUniqueIndexOnTokensValue < ActiveRecord::Migration | |
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2 | def up | |
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3 | say_with_time "Adding unique index on tokens, this may take some time..." do | |
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4 | # Just in case | |
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5 | duplicates = Token.connection.select_values("SELECT value FROM #{Token.table_name} GROUP BY value HAVING COUNT(id) > 1") | |
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6 | Token.where(:value => duplicates).delete_all | |
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7 | ||
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8 | add_index :tokens, :value, :unique => true, :name => 'tokens_value' | |
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9 | end | |
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10 | end | |
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11 | ||
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12 | def down | |
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13 | remove_index :tokens, :name => 'tokens_value' | |
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14 | end | |
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15 | end | |
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