discourse/db/migrate/20210324043327_delete_orpha...

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# frozen_string_literal: true
class DeleteOrphanPostRevisions < ActiveRecord::Migration[6.0]
def up
sql = <<~SQL
DELETE FROM post_revisions
USING post_revisions pr
LEFT JOIN posts ON posts.id = pr.post_id
WHERE posts.id IS NULL
AND post_revisions.id = pr.id
SQL
execute(sql)
end
def down
raise ActiveRecord::IrreversibleMigration
end
end