NHibernate provides many places for extension. Among them is the Session IInterceptor
. There is documentation with many details:
http://nhibernate.info/doc/nh/en/index.html#objectstate-interceptors
In this case, we can create our custom one, which will be observing our entity (for example Client) and a property which must be updated every time (for example Code). So our implementation could look like this:
public class MyInterceptor : EmptyInterceptor
{
public override int[] FindDirty(object entity, object id, object[] currentState, object[] previousState, string[] propertyNames, NHibernate.Type.IType[] types)
{
var result = new List<int>();
// we do not care about other entities here
if(!(entity is Client))
{
return null;
}
var length = propertyNames.Length;
// iterate all properties
for(var i = 0; i < length; i++)
{
var areEqual = currentState[i].Equals(previousState[i]);
var isResettingProperty = propertyNames[i] == "Code";
if (!areEqual || isResettingProperty)
{
result.Add(i); // the index of "Code" property will be added always
}
}
return result.ToArray();
}
}
NOTE: This is just an example! Apply your own logic for checking the dirty properties.
And we have to wrap Session
this way:
var interceptor = new MyInterceptor()
_configuration.SetInterceptor(interceptor);
And this is it. While Client is marked as dynamic-update, the property Code will always be set as dirty
<class name="Client" dynamic-update="true" ...