mastodon/app/models/concerns/ranked_trend.rb

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# frozen_string_literal: true
module RankedTrend
extend ActiveSupport::Concern
included do
scope :by_rank, -> { order(rank: :desc) }
scope :ranked_below, ->(value) { where(rank: ..value) }
end
class_methods do
def recalculate_ordered_rank
connection
.exec_update(<<~SQL.squish)
UPDATE #{table_name}
SET rank = inner_ordered.calculated_rank
FROM (
SELECT id, row_number() OVER w AS calculated_rank
FROM #{table_name}
WINDOW w AS (
PARTITION BY language
ORDER BY score DESC
)
) inner_ordered
WHERE #{table_name}.id = inner_ordered.id
SQL
end
end
end