Seam Application Framework : association management

[patrick.antivackis]

I do not really understand the association management as explained in Chapter 14 of SEAM 1.1GA documentation. Is there a place where to find the complete example described in this chapter ?
If no, does someone know how to use the concept of @DataModel and @DataModelSelector with the Framework.

Thank you

[norman.richards]

Here's one way to get started, I suppose. In general, I think you'd want to combine an EntityQuery with an EntityHome though, and not mess about with manually managing it like this.

@Name("fooList")
public class FooList
 extends EntityQuery
{
 @DataModelSelection
 Foo selectedFoo;

 @DataModel
 public List getAllFoo() {
 return super.getResultList();
 }

 public void actOnSelected() {
 .... use selectedFoo
 }
}

[patrick.antivackis]

Hello Norman, thank for your time and help, so to make it clearer just let's stick to the example in chapter 14. We have the person class :

@Entity
public class Person {
 @Id private Long id;
 private String firstName;
 private String lastName;
 private Country nationality;

 //getters and setters...
}

The personHome class :

<h1>
 <h:outputText rendered="#{!personHome.managed}" value="Create Person"/>
 <h:outputText rendered="#{personHome.managed}" value="Edit Person"/>
</h1>
<h:form>
 <div>First name: <h:inputText value="#{person.firstName}"/></div>
 <div>Last name: <h:inputText value="#{person.lastName}"/></div>
 <div>
 <h:commandButton value="Create Person" action="#{personHome.persist}" rendered="#{!personHome.managed}"/>
 <h:commandButton value="Update Person" action="#{personHome.update}" rendered="#{personHome.managed}"/>
 <h:commandButton value="Delete Person" action="#{personHome.remove}" rendered="#{personHome.managed}"/>
 </div>
</h:form>

@Name("personHome")
public class PersonHome extends EntityHome<Person> {

 @In Country country;

 @Factory("person")
 public Person initPerson() { return getInstance(); }

 public void migrate()
 {
 getInstance().setCountry(country);
 update();
 }
}

A country class, let's say :

@Entity
public class Country {
 @Id private Long id;
 private String countryName;

 //getters and setters...
}

The database is populated with countries.

An entity query for the countries ;

<framework:entity-query name="countries" ejbql="select c from Country c"/>

The editPerson as defined in the example :

<h1>
 <h:outputText rendered="#{!personHome.managed}" value="Create Person"/>
 <h:outputText rendered="#{personHome.managed}" value="Edit Person"/>
</h1>
<h:form>
 <div>First name: <h:inputText value="#{person.firstName}"/></div>
 <div>Last name: <h:inputText value="#{person.lastName}"/></div>
 <div>
 <h:commandButton value="Create Person" action="#{personHome.persist}" rendered="#{!personHome.managed}"/>
 <h:commandButton value="Update Person" action="#{personHome.update}" rendered="#{personHome.managed}"/>
 <h:commandButton value="Delete Person" action="#{personHome.remove}" rendered="#{personHome.managed}"/>
 </div>
</h:form>

My question is : Is there an easy way to add a country selector in the editPerson page ?

Thank you

[atzbert]

In fact there is a very convenient way to realize this. by using the http://wiki.jboss.org/wiki/Wiki.jsp?page=SeamSelectItemsNewDesign component.

<si:selectItems value="#{countries.resultList}" var="country" label="#{country.countryName}" noSelectionLabel="Select One..."/>

:)

ps: I guess I don't know how to use the url formatter correctly...it always prints the url instead of the text I entered in the tag :/

[atzbert]

I forgot..., u probably wanna surround the si:selectitems with a h:selectone or smth similar:

<h:selectOneMenu value="#{person.country}" >
<si:selectItems value="#{countries.resultList}" var="country" label="#{country.countryName}" noSelectionLabel="Select One..."/>
</h:selectOneMenu>

:P

[patrick.antivackis]

Thanks Atzbert, your link to the selectItems was great, have example using the framewrok inside. Just what i was looking for