discourse/db/migrate/20140306223522_move_topic_r...

44 lines
932 B
Ruby

class MoveTopicRevisionsToPostRevisions < ActiveRecord::Migration[4.2]
def up
execute <<SQL
INSERT INTO post_revisions(user_id, post_id, modifications, number, created_at, updated_at)
SELECT tr.user_id, p.id, tr.modifications, tr.number, tr.created_at, tr.updated_at
FROM topic_revisions tr
JOIN topics t ON t.id = tr.topic_id
JOIN posts p ON p.topic_id = t.id AND p.post_number = 1
SQL
execute <<SQL
UPDATE post_revisions r SET number = 2 + (
SELECT COUNT(*) FROM post_revisions r2
WHERE r2.post_id = r.post_id AND r2.created_at < r.created_at
)
SQL
execute <<SQL
UPDATE posts p SET version = 1 + (
SELECT COUNT(*) FROM post_revisions r
WHERE r.post_id = p.id
)
SQL
execute <<SQL
DROP TABLE topic_revisions
SQL
end
def down
# strictly, we could reverse this, but not implemented
raise ActiveRecord::IrreversibleMigration
end
end