2023-08-06 17:45:45 -07:00
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class IndexClosetHangerQuery < ActiveRecord::Migration[3.2]
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2012-03-21 16:25:30 -07:00
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def self.up
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# SELECT COUNT(DISTINCT `closet_hangers`.`id`) FROM `closet_hangers` INNER
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# JOIN `users` ON `users`.`id` = `closet_hangers`.`user_id` LEFT OUTER JOIN
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# `closet_lists` ON `closet_lists`.`id` = `closet_hangers`.`list_id` WHERE
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# `closet_hangers`.`owned` = XXX AND (`closet_hangers`.item_id = XXX) AND
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# ((`closet_hangers`.`list_id` IS NULL AND
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# `users`.`owned_closet_hangers_visibility` >= XXX OR
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# `closet_lists`.`visibility` >= XXX));
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# It's not a huge improvement over the association index, but it's nice to
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# be able to scan fewer rows for so little penalty, right?
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remove_index :closet_hangers, :item_id
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add_index :closet_hangers, [:item_id, :owned]
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end
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def self.down
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remove_index :closet_hangers, [:item_id, :owned]
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add_index :closet_hangers, :item_id
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end
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end
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