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POHow to enforce constraint such as any field (or specific field) must not change if entity is in some state?
 

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  1. POHow to enforce constraint such as any field (or specific field) must not change if entity is in some state?
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    <p>I'm trying to use DDD in my current project (c#, mvc, nhibernate, castle) and I'm thinking of best way to check a constraint that says any field (or specific field) must not change if entity is in some state, ie. invoice that is booked (state=booked) must not have amount field changed. In service layer I get some DTO object (from gui or web service, etc) that I need to map to domain object. After mapping is complete I want to validate my object - in particular I want to check the specific constraint in my question.</p> <p>Currently I'm thinking of:</p> <ul> <li>tracking changes at entity level, i.e. on every setter add field to changed fields collection and switch NHibernate to use field access strategy. Variation of this pattern would be to throw exception on setter if changing value is not allowed</li> <li>creating copy of object before mapping and the comparing original and mapped values</li> <li>falling back on nhibernate and get this information from nhibernate session - however the rule will not be enforced at entity level (imho it breaks ddd)</li> </ul> <p>What do you think about it? Do you know any good patterns for this? Or am I missing something and I need to change my way of thinking about this constraint?</p> <p>Thanks in advance for help.</p>
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