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Fetching to-one-relationship: How to use willRead and willReadRelationship?
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Fetching to-one-relationship: How to use willRead and willReadRelationship?


  • Subject: Fetching to-one-relationship: How to use willRead and willReadRelationship?
  • From: Fred Opims <email@hidden>
  • Date: Sun, 26 Jun 2011 20:01:06 -0400

Hi!
I have some problem to a to-one relationship.
I have an Entity with 3 properties ( color, brand, model) and one relationship Responsable,

When i make a fetch, i'm able to access to all propeties, but i can't access to relation responsable.
Here is the code

        String imm = vehicule.immatriculation();  //Access OK
        String marque = vehicule.marque(); //Access OK
        String modele = vehicule.modele(); //Access OK

When i do
    Responsable resp = vehicule.responsable(); i have a _objectFaultWithSnapshotRelationshipEditingContext exception.

In the WebObject Entreprise Objects Programming Guide, it is written that the fault is fired when the relationship's data is needed.

But when i do the following, i still have the same _objectFaultWithSnapshotRelationshipEditingContext exception.

        String name= vehicule.responsable().name();
        String firstname= vehicule.responsable().firstname();

It is also written to call willRead() before accessing to the relationship's data.

So i did:
          vehicule.willRead();
            String name= vehicule.responsable().name();
        String firstname= vehicule.responsable().firstname();

But it doesn't work. Same exception

After that, in Vehicule.java i did the following as suggested in the doc:

public class Vehicule extends _Vehicule {
    @SuppressWarnings("unused")
    private static Logger log = Logger.getLogger(Vehicule.class);
   
     public com.package.Responsable responsable() {
         willRead();
            return super.responsable();
     }
     
        public static boolean usesDeferredFaultCreation() {

            return true;

        }
}

I made sure the my model is valid and that data in the database are well set.

Can you tell me please if i'm using willRead the right way? How can i access to this relationship?

Thank you very much!

Fred
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