mastodon/db/migrate/20180812173710_copy_status_...

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class CopyStatusStats < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
safety_assured do
execute <<-SQL.squish
INSERT INTO status_stats (status_id, reblogs_count, favourites_count)
SELECT id, reblogs_count, favourites_count
FROM statuses
ON CONFLICT (status_id) DO UPDATE
SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
SQL
end
end
def down
# Nothing
end
end