Also, restore the correct class attribute.
Also, restore the correct class attribute.


Former-commit-id: 7426a9593aed41dcf876dd08f4f451ed62933622 [formerly 7426a9593aed41dcf876dd08f4f451ed62933622 [formerly a54b6e8043fd71c5dea84b6fb103c5f5efd65882]]
Former-commit-id: 2c0c68f0e7ade20218f62259a6702aecf07796ba
Former-commit-id: 16848bc746f2525f268ef559151a56fac9d26e2b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine