This way it can assign the order cycles to the schedule when this is
persisted. An OrderCycleSchedule (the join table) can't be created until
both schedule and order_cycle got an id.
Also, we do not call `#adapt_params` when creating the Schedule as that
assigns `order_cycle_ids` to `@object.attributes` thus, attempting to
create the OrderCycleSchedule without a schedule_id.
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