I am trying to re-create a one-to-one mapping from chapter 8 of the
book "Java Persistence with Hibernate" using the "properties" mapping
element. I have a collection mapped but would also like to select one
item out of the collection, as illustrated in the mapping below.
Is this a use case NHibernate does not currently support? If this
isn't supported what would be the correct method of achieving this?
class Bid {
public virtual int Id { get; set; }
public virtual decimal Amount { get; set; }
public virtual Item Item { get; set; }
public virtual bool Successful { get; set; }
}
class Item {
public virtual int Id { get; set; }
public virtual Bid SuccessfulBid { get; set; }
public virtual ISet<Bid> Bids { get; set; }
public Item() {
this.Bids = new HashedSet<Bid>();
}
}
<class name="Bid" table="BID">
<id name="Id" column="BID_ID">
<generator class="native" />
</id>
<property name="Amount" column="AMOUNT" />
<properties name="successfulReference">
<property name="Successful" column="SUCCESSFUL" type="YesNo" />
<many-to-one name="Item" class="Item" column="ITEM_ID" />
</properties>
</class>
<class name="Item" table="ITEM">
<id name="Id" column="ITEM_ID">
<generator class="native" />
</id>
<one-to-one name="SuccessfulBid" property-ref="successfulReference">
<formula>'Y'</formula>
<formula>ITEM_ID</formula>
</one-to-one>
<set name="Bids" inverse="true">
<key column="ITEM_ID" />
<one-to-many class="Bid" />
</set>
</class>
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