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11 lines
458 B
Ruby
11 lines
458 B
Ruby
class IndexUserBadges < ActiveRecord::Migration
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def change
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execute 'DELETE FROM user_badges USING user_badges ub2
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WHERE user_badges.badge_id = ub2.badge_id AND
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user_badges.user_id = ub2.user_id AND
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user_badges.post_id IS NOT NULL AND
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user_badges.id < ub2.id
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'
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add_index :user_badges, [:badge_id, :user_id, :post_id], unique: true, where: 'post_id IS NOT NULL'
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end
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end
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