consistency

[Bennie Kloosteman]

I often see cqrs samples  go 

Do Something to in memory model .

Persist()

Fire Events;   // in Event Sourcing some events do the  persisting ,..

but doesn't this allow the domain to get out of wack with the database ? eg what if the model is updated and then the database transaction fails ?   

Or do you work with singular roots and only allow another command to use that once the data is persisted ?

Regards, 

Ben

[Greg Young]

Changes are transient until persisted. If a persist fails the easiest thing is to evict the ibject from memory though you can support undos

[Bennie Kloosteman]

Thanks a lot for your comments Greg , is it common to do this ? Or do people live with it unless a specific requirement ?

Ben

[@yreynhout]

Unit of work?