Description
The two step hydration process is too complex. To make this simpler, the point at which records are saved should be moved into the hydrator - i.e. the hydrator is responsible for transferring the data into the domain record plus persisting the change. (In cases where it is creating a new domain record, it can therefore also create the record).
This means for the Eloquent hydrator, the fact that some data transfer needs to occur after the primary domain record has been created is hidden internally within the Eloquent hydrator.
The creating, created etc hooks can still be on the controller as the controller knows what it is doing when passing off to the hydrator. Likewise, the transaction should also be on the controller, as it wraps the entire process.