discourse/db/migrate/20140705081453_index_user_b...

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# frozen_string_literal: true
class IndexUserBadges < ActiveRecord::Migration[4.2]
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def change
execute "DELETE FROM user_badges USING user_badges ub2
WHERE user_badges.badge_id = ub2.badge_id AND
user_badges.user_id = ub2.user_id AND
user_badges.post_id IS NOT NULL AND
user_badges.id < ub2.id
"
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add_index :user_badges, %i[badge_id user_id post_id], unique: true, where: "post_id IS NOT NULL"
end
end