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    <p>in mapping if you use FluentNHibernate</p> <pre><code>public UserMap : ClassMap&lt;User&gt; { public UserMap() { Where("id = currentid"); // always bring back the most recent } } // in Userrepository public void Update(User user) { var clone = user.Clone(); session.Evict(user); // to prevent flushing the changes var newId = session.Save(clone); session.CreateQuery("UPDATE User u SET u.currentid = :current") // &lt;-- hql .SetParameter("current", newId) .ExecuteUpdate(); } </code></pre> <p>objectgraphs are a lot trickier with this simple code. I would then do one of the following:</p> <ul> <li>use NHibernate.Envers to store auditing information for me</li> <li>explicitly creating new entities in BL code</li> </ul> <p>i once saw an append-only-model doing something like the following</p> <pre><code>// UserBase is there to ensure that all others referencing the User doesnt have to update because user properties changed class UserBase { public virtual int Id { get; set; } public virtual ICollection&lt;PersonDetails&gt; AllDetails { get; private set; } public virtual PersonDetails CurrentDetails { get { return _currentDetauils; } set { _currentDetauils = value; AllDetails.Add(value); } } // same as above public virtual ICollection&lt;ConfigDetails&gt; AllConfigs { get; set; } } class Order { public virtual int Id { get; set; } public virtual UserBase User { get; set; } public virtual IList&lt;OrderDetail&gt; AllDetails { get; private set; } public virtual IList&lt;OrderDetail&gt; ActiveDetails { get; private set; } public virtual void Add(OrderDetail detail) { AllDetails.Add(detail); ActiveDetails.Add(detail); } public virtual void Delete(OrderDetail detail) { detail.Active = false; ActiveDetails.Remove(detail); } } class OrderDetail { public virtual int Id { get; set; } public virtual Order Parent { get; set; } public virtual bool Active { get; set; } } class OrderMap : ClassMap&lt;Order&gt; { public OrderMap() { HasMany(o =&gt; o.AllDetails); HasMany(o =&gt; o.ActiveDetails).Where("active=1"); } } // somewhere public void UpdateTaxCharge(OrderDetail detail, TaxCharge charge) { var clone = detail.Clone(); clone.TaxCharge = charge; detail.Order.Delete(detail); detail.Order.Add(clone); } </code></pre>
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    1. COfeel bad asking, but can't how this works... can you elaborate @Firo? Where does all of this go, and what do you do about saving an object graph (order => order details => order details tax charge)
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    2. COWhat if you're not using fluent nHibernate, but the *.hbm.xml files? feel a bit guilty, but didn't specify that I wasn't using fluent yet. Just getting into nHibernate, as I was more of an avid user of EntityFramework, Linq-to-SQL, and DevExpress XPO Objects before. @Firo
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    3. COShould also ask, is your "Clone()" method something that you implemented, or are you using an extension method, etc. to implement that? I know of .MemberwiseClone(), but never saw a Clone() method in std. c#
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