mastodon/db/migrate/20180812173710_copy_status_stats.rb

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class CopyStatusStats < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
safety_assured do
Status.where.not(id: StatusStat.select('status_id')).select('id').find_in_batches do |statuses|
execute <<-SQL.squish
INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
SELECT id, reblogs_count, favourites_count, created_at, updated_at
FROM statuses
WHERE id IN (#{statuses.map(&:id).join(', ')})
ON CONFLICT (status_id) DO UPDATE
SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
SQL
end
end
end
def down
# Nothing
end
end