Hi All,

Very, very new to NHib so appologise in advance for stupidity. I need to diectly copy an entity based upon another one and persist.

I have looked at SaveOrUpdateCopy which seems to do the job except that it automatically assigns a new Id which I cannot use to write to the DB as SQL server is being used to generate the identifier thus I get the old.

"Cannot insert explicit value for identity column in table 'xxx' when IDENTITY_INSERT is set to OFF."

Additionally, if I manually reset the identifier field to null I get NHib throwing an exception telling me I have change this. Amy ideas how I go about this?

Chris.

The recommended way is to do the hard work and implement a Clone() method, then save the copy. For example:

If i understand ýou correct, you want to save a new object to the database based on an old objects values. Assuming you have an unsaved-value on your native identity mapping, you should be able to do this:

Car car = session.Get<Car>(id);
session.Evict(car);
car.ID = 0; //or your unsaved-value
session.Save(car);

karlchu - Thanks for the reply, I didnt want to have to go down the route of implementing IClonable for all my entities ad there are a load of them and this is just a concept at the moment, so was looking for a "quick and easy" option.

jta - Cheers, I'm just getting to grips with NHib and didn't previously see the value in the Evict method, but it makes sense to me know. Thanks for the help.