This is probably more a DDD question then NH. Let say you have observable collections that raise events before collection gets changed and after. Let's say you have a rule that only person's over 21 can be added to the collection. How would you handle this rule: 1. don't let collection be modified directly but use Add/remove and enforce rule there 2. create delegate that will check rule in OnChanging step and veto change 3. allow person to be added and run validate before persisting entity using NH events, basically allow entity to get into invalid state 4. manually invoke validation before commiting changes. 5. something else ?
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