AK <ama-l...@...> writes:
> I have two questions:
>
> I have two model objects, Item and Person that have a one-to-one
> relationship driven by the primary key. Each of these objects extend a
> ModelBase object that has a generated ID (annotations: @Id and
> @GeneratedValue).
>
> Am I correct to relate these objects to one another like this?
>
> @Entity
> public class Item extends ModelBase {
>
> @OneToOne @PrimaryKeyJoinColumn
> private Person person;
> ...
> // getters and setters
> }
>
> @Entity
> public class Person extends ModelBase {
>
> @OneToOne
> private Item item;
> ...
> // getters and setters
> }
>
> Furthermore, how do I assign values to these in my action class when
> populating via a form that assigns values to attributes in each model?
> Right now, I have an action bean that is supposed to populate both, but on
> persistence, my Person object is always null:
>
> public class ItemFormActionBean extends BaseActionBean {
>
> @ValidateNestedProperties ({
> @Validate(field="name", required=true, on="submit"),
> @Validate(field="desc", required=true, on="submit"),
> })
> private Item item;
>
> @ValidateNestedProperties ({
> @Validate(field="eMail", required=true, on="submit",
> converter=EmailTypeConverter.class)
> })
> private Person person;
> ...
> // getters and setters
>
> public Resolution submit() {
>
> EntityManager em = Stripersist.getEntityManager();
>
> em.persist(item);
> em.persist(person);
> em.getTransaction().commit();
> ...
> }
> ...
> }
I'm following up on this post for anyone that might be running into the same
issues. I got some great help on the IRC channel, and thanks to those that
helped resolved this, espescially aporter.
According to the 2nd example in the OneToOne JavaDoc (http://java.sun.com/
products/persistence/javadoc-1_0-fr/javax/persistence/OneToOne.html) I had the
Item model contain a Person model but not the other way around:
@Entity
public class Item extends ModelBase {
@OneToOne
private Person person;
...
}
@Entity
public class Person extends ModelBase {
// no reference to Item
...
}
Secondly, because of this relationship you have to act on the Person model /
through/ Item. In the JSP:
....
<tr> <!-- *** access person's email field through item *** -->
<td><s:label for="item.person.email">E-mail:</s:label></td>
<td><s:text name="item.person.email" class="required"/></td>
<td><s:errors field="item.person.email"/></td>
</tr>
<tr>
<td><s:label for="item.name">Item Found:</s:label></td>
<td><s:text name="item.name" class="required"/></td>
<td><s:errors field="item.name"/></td>
</tr>
...
In the action bean for validation:
...
public class ItemFormActionBean extends BaseActionBean {
@ValidateNestedProperties ({
@Validate(field="person.email", required=true, on="addItem",
converter=EmailTypeConverter.class),
@Validate(field="name", required=true, on="addItem"),
@Validate(field="desc", required=true, on="addItem"),
@Validate(field="dateFound", required=false, on="addItem"),
@Validate(field="stateId", required=true, on="addItem"),
@Validate(field="cityId", required=true, on="addItem")
})
private Item item;
...
...and for persistence:
public Resolution addItem() {
EntityManager em = Stripersist.getEntityManager();
em.persist(item);
// persist Person *in* Item
em.persist(item.getPerson());
em.getTransaction().commit();
...
Hope this helps.
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