discourse/db/migrate/20140809224243_add_user_bad...

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# frozen_string_literal: true
class AddUserBadgeUniqueIndex < ActiveRecord::Migration[4.2]
def up
# used to keep badges distinct
add_column :user_badges, :seq, :integer, default: 0, null: false
# invent artificial seq for badges
execute "
UPDATE user_badges ub1 SET seq = X.seq
FROM (
SELECT ub.id, rank() OVER (PARTITION BY user_id ORDER BY granted_at) seq
FROM user_badges ub
JOIN badges b ON b.id = ub.badge_id
WHERE b.multiple_grant
) X
WHERE ub1.id = X.id
"
# delete all single award dupes
execute "
DELETE FROM user_badges ub1
WHERE ub1.id NOT IN (
SELECT MIN(ub.id)
FROM user_badges ub
GROUP BY ub.user_id, ub.badge_id, ub.seq
)
"
add_index :user_badges, [:badge_id, :user_id, :seq], unique: true, where: 'post_id IS NULL'
end
def down
remove_column :user_badges, :seq, :integer
end
end