discourse/db/migrate/20200107161405_add_featured...

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# frozen_string_literal: true
class AddFeaturedRankToUserBadges < ActiveRecord::Migration[6.0]
def change
add_column :user_badges, :featured_rank, :integer, null: true
execute <<~SQL
WITH featured_tl_badge AS -- Find the best trust level badge for each user
(
SELECT user_id, max(badge_id) as badge_id
FROM user_badges
WHERE badge_id IN (1,2,3,4)
GROUP BY user_id
),
ranks AS ( -- Take all user badges, group by user_id and badge_id, and calculate a rank for each one
SELECT
user_badges.user_id,
user_badges.badge_id,
RANK() OVER (
PARTITION BY user_badges.user_id -- Do a separate rank for each user
ORDER BY BOOL_OR(badges.enabled) DESC, -- Disabled badges last
MAX(featured_tl_badge.user_id) NULLS LAST, -- Best tl badge first
CASE WHEN user_badges.badge_id IN (1,2,3,4) THEN 1 ELSE 0 END ASC, -- Non-featured tl badges last
MAX(badges.badge_type_id) ASC,
MAX(badges.grant_count) ASC,
user_badges.badge_id DESC
) rank_number
FROM user_badges
INNER JOIN badges ON badges.id = user_badges.badge_id
LEFT JOIN featured_tl_badge ON featured_tl_badge.user_id = user_badges.user_id AND featured_tl_badge.badge_id = user_badges.badge_id
GROUP BY user_badges.user_id, user_badges.badge_id
)
-- Now use that data to update the featured_rank column
UPDATE user_badges SET featured_rank = rank_number
FROM ranks WHERE ranks.badge_id = user_badges.badge_id AND ranks.user_id = user_badges.user_id
SQL
end
end