14 lines
512 B
Ruby
14 lines
512 B
Ruby
class AddUniqueIndexOnNotifications < ActiveRecord::Migration
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tag :postdeploy
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def self.up
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# the excess subquery is necessary to avoid error 1093 on mysql
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Notification.where("id NOT IN (SELECT * FROM (SELECT MIN(id) FROM #{Notification.quoted_table_name} GROUP BY name) x)").delete_all
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add_index :notifications, [:name], :unique => true, :name => "index_notifications_unique_on_name"
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end
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def self.down
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remove_index :notifications, :name => "index_notifications_unique_on_name"
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end
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end
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