How do reference an Entity from a value object in Hibernate/NHibernate?

Question

VALUE OBJECTS can even reference ENTITIES. For example, if I ask an online map service for a scenic driving route from San Francisco to Los Angeles, it might derive a Route object linking L.A. and San Francisco via the Pacific Coast Highway. That Route object would be a VALUE, even though the three objects it references (two cities and a highway) are all ENTITIES.

page #98

In Hibernate if I have a value object I can map it with as a component. What if I want to reference an entity form that component?

Example:

I have a Users table.
Each User can have many addresses.
I create a addresses table, but I treat the addresses as value objects in my domain.
Each address have a type (work address, home address,...etc.)
I create a address type table as a look up and treat it as an entity in my domain.
An address should have a reference to it type.

How can I achieve that?

Why is address type an entity? Do you care about its identity? — JefClaes
– JefClaes, Commented Nov 11, 2013 at 18:25
@JefClaes I was influenced by this question on SO. Do you think it's better modeled as a VO? — Songo
– Songo, Commented Nov 11, 2013 at 20:35

Daniel Schilling · Accepted Answer · 2013-11-11 14:30:34Z

See the documentation.

The <component> element maps properties of a child object to columns of the table of a parent class. Components may, in turn, declare their own properties, components or collections. See "Components" below.
<component>  <property ...../> <many-to-one .... /> ........ </component>

Notice the example property and many-to-one in the code above. To create a reference to another entity, you simply use many-to-one inside the component, just as you would outside the component.

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