s:selectItems and s:convertEntity

[stereoscope]

Hi!

i tried to put in a component into my jsf page! suddenly many obstacles came into my way. after a while i figured out how to come along with this issue but i have some questions.

well i have an entity representing a location and another entity which describes a locationType and the address entity  holding the address for the specific location.

@Entity
public class Location {

     private Long id;
     private String name;
     private Address address;
     private String description;
     private LocationType locationType;

        @OneToOne(cascade = CascadeType.ALL)
        @JoinColumn(name="address_fk")
     public Address getAddress() {
          return address;
     }
        @OneToOne
        @JoinColumn(name="locationType_fk")
     public LocationType getLocationType() {
          return locationType;
     }

@Entity
public class LocationType {

     private Long id;
     private Location location;
     private String locationType_de;
     private String locationType_en;

        @OneToOne(mappedBy = "locationType")
        public Location getLocation() {
        return location;
        }

@Entity
public class Address {

    private Long id;
    private String countryNameCode;
    private String administrativeAreaName;
    private String subAdministrativeAreaName;
    private String localityName;
    private String thoroughfareName;
    private String postalCodeNumber;
    private GLatLng coordinates;
    private User user;
    private Location location;

    @OneToOne(mappedBy = "address")
    public User getUser() {
     return user;
    }
     
    @OneToOne(mappedBy = "address")
    public Location getLocation() {
     return location;
    }

furthermore i have written down a form and i want to display the different types of locations in a dropdown box. this actually works. i did this way that i fill a list with locationtype objects and add the objects attributes either englisch or german to a list of the type SelectItems to pass it to the page...

but i dont know how to merge the chosen value from the selectonemenu back to an object.

or is there an easier way!?

public ArrayList<SelectItem> getLocationType() {

          types = em.createQuery("Select type from LocationType type").getResultList();

          for (LocationType loc : types) {
               locationType.add(new SelectItem(loc.getLocationType_de()));
          }          
          return locationType;          
     }

anybody an idea!?

[stereoscope]

HELP!

[umajeric]

Try this:

public List<LocationType> getLocationType() {
          return em.createQuery("Select type from LocationType type").getResultList();     
     }

[umajeric]

And then:

<h:selectOneMenu value="#{location.locationType}" >
     <s:selectItems value="#{locationType}" var="type" label="#{type.locationType_de}" />
     <s:convertEntity/>
</h:selectOneMenu>

[stereoscope]

hi!

thanks for you message! i tried out your suggestion but i had to realize that s:selectItems requires a list of objects of the type SelectItem!

Is there any other possibility to come along with this issue!?

greetings

[nickarls]

Behold, the s:convertEntity

(remember to override your equals() and hashCode() in the entity)

[danielc.roth]

s:selectItem does not only take a list of selectItems.

You may have a List<Person> with id/name as fields in entity Person and then just do the following:

<h:selectOneMenu value="#{bean.chosenPerson}" >
     <s:selectItems value="#{bean.people}" var="person" label="#{person.name}" />
     <s:convertEntity/>
</h:selectOneMenu>

And chosen person will be assigned to bean.chosenPerson on submit.

I use war in jboss4.2.2 and have often added this to components.xml. I have forgotten why though... might be because I named the EntityManager em and not entityManager.

<component name="org.jboss.seam.ui.EntityConverter">
  <property name="entityManager">#{em}</property>
</component>

[stereoscope]

ufffffff!??

well...override? hashcode equals...! why ? is there any example or documentation out there dealing with this stuff.!

hehe ... didnt't get your point ... sorry!

cheers

[danielc.roth]

There are probably thousands of users who have got this working.
Search the source example there are a few:

daniel@daniel-linux:~/testing/seam-trunk/examples$ grep -i -r convertentity * | grep -v svn | cut -d':' -f1
dvdstore/view/WEB-INF/incl/searchbox.xhtml
seambay/view/search.xhtml            
seambay/view/buy.xhtml               
seamdiscs/view/disc.xhtml   

I have removed some uninteresting hits. In other words, look in the  dvdstore, seambay, seamdiscs samples.

[stereoscope]

hmm..

i tried this one out and it worked. the menu is filled now with the right values! but if i try to submit the form in which the menu is integrated i get an error on the server side that the posted value of the menu is invalid!

of course if the type of the selectitem is e.g. LocationType
the value passed by the selectonemenu must be LocationType at the serverside!

....

[nickarls]

Sound like a classic hashCode(), equals() issue, post your entity

[stereoscope]

in the first entry of this site are the entities!

hear is the select menu from the page

<s:decorate id="typeDecorate" template="/layout/edit.xhtml">
   <ui:define name="label">#{messages['location.type']}</ui:define> 
       <h:selectOneMenu id="selectLocation" value="{locationBean.type}">
          <s:selectItems value="#{locationBean.locationType}" 
                         var="type" 
                      label="#{type.locationType_de}" 
                      noSelectionLabel="#{messages['location.select']}"/>
          <s:convertEntity/>
        </h:selectOneMenu>
</s:decorate>

@PersistenceContext
private EntityManager em;

private LocationType type;

public List<LocationType> getLocationType() {
          
          List<LocationType> list =  em.createQuery("Select type from LocationType type").getResultList();
          return list;
}

public LocationType getType() {
          return type;
}

public void setType(LocationType type) {
          this.type = type;
}

thats it there isn't more!

[nickarls]

Try using a seam-managed persistence context.

[stereoscope]

well...ain't im using this persintence context if i inject the persistence context into my bean !?

[nickarls]

No, it's injected with @In. Show your components.xml