discourse/db/migrate/20210621234939_backfill_ema...

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# frozen_string_literal: true
class BackfillEmailLogTopicId < ActiveRecord::Migration[6.1]
disable_ddl_transaction!
BATCH_SIZE = 30_000
def up
loop do
count = DB.exec(<<~SQL, batch_size: BATCH_SIZE)
WITH cte AS (
SELECT l1.id, p1.topic_id
FROM email_logs l1
INNER JOIN posts p1 ON p1.id = l1.post_id
WHERE l1.topic_id IS NULL AND p1.topic_id IS NOT NULL
LIMIT :batch_size
)
UPDATE email_logs
SET topic_id = cte.topic_id
FROM cte
WHERE email_logs.id = cte.id
SQL
break if count == 0
end
end
def down
raise ActiveRecord::IrreversibleMigration
end
end