If a property is unmapped, from NHibernate's perspective it doesn't exist.
A reasonable alternative is creating a query only property (see
http://ayende.com/Blog/archive/2009/06/10/nhibernate-ndash-query-only-properties.aspx)
which replicates the logic of Age, but in SQL.
It's a bit of a hack, but at least it's transparent to your queries.

   Diego


On Wed, Apr 28, 2010 at 18:29, Matt Mangold <[email protected]>wrote:

> I would like to know if it is possible to create a query where I add
> an unmapped property to my projected output.
>
> Here is an example
>
> I have a class called Person
>
> Person has 3 properties
> Name
> Birthday
> Age
>
> Name and Birthday are mapped to the database, and Age is calculated
> based on today's date, hence it is not mapped.
>
> When I create a criteria query and I add Age to my projections list, I
> get an error when I execute the query:
>
> NHibernate.QueryException: could not resolve property: Age
>
> Does anyone know if I am able to put unmapped properties from my
> entity into my query projections?
>
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