Variable One to One - difficult question

Question

Hi
I am using a Variable One to One mapping but TL is not using the class indicator information to produce the correct SQL and I wonder what I am doing wrong.
I have the following simplified database design:
Users:
userId (pk)
Applications:
applicationId (pk)
ServiceProviders
serviceProviderId (pk)
applicationId (fk)
Services
serviceId (pk)
serviceProviderId (fk)
UserEntities
userId (pk, fk)
entityId (pk)
entityTypeId (pk)
The Id values for different entity types are mutually exclusive - there can be a serviceId #1 and a serviceProviderId #1.
I have several classes that implement an Entity interface (Application, ServiceProvider, Service), and a UserEntity class containing a reference to a User and an Entity.
In the descriptors for classes implementing Entity I have a one to many mapping to UserEntity, with a table reference constructed in MW, and a single source / target field pair of e.g. entityId - applicationId. In the UserEntity descriptor I have a one to one mapping to User and a variable one to one mapping to Entity. This contains a Class Indicator based on the entityTypeId field, and values for each class implementing Entity have been entered.
It seems that when I insert a new UserEntity instance, this class indicator value is used to supply a value for the entityTypeId field. When I access the userEntities collection from a User instance, the class indicator is used to instantiate the correct kind of Entity. But when I access the userEntities collection from an instance of the an Entity class like the Application class, the EntityTypeId is not specified in the SQL generated:
ServerSession(30932017)--Connection(24156236)--SELECT ENTITYID, ENTITYTYPEID, USERID FROM USERENTITIES WHERE (ENTITYID = ?)
bind => [1]
#### I would expect 'AND ENTITYTYPEID = ? ..... bind => [2]' here #####
I would expect the class indicator info to be used both ways, when determining what class to instantiate for the variable one to one, and also to make the query specific to that class when an instance is being used.
Many thanks if you can shed some light on this. Perhaps I have to use an API method as demonstrated in this post how can i map this?
James

Answer 1

James
Thanks for your reply.
I have a similar NullPointerException on the validateNode method. I slavishly followed your code example - hope it was right :), so will raise this with Oracle support.
public static void amendApplicationUserEntityResp(Descriptor descriptor) {
     OneToManyMapping mapping = (OneToManyMapping) descriptor.getMappingForAttributeName("responsibilitiesInherited");
     ExpressionBuilder builder = new ExpressionBuilder();
     mapping.setSelectionCriteria(
          builder.getField("USERENTITYRESPINHERITED.ENTITYID").equal(builder.getParameter("APPLICATIONS.APPLICATIONID")
          .and(builder.getField("USERENTITYRESPINHERITED.ENTITYTYPEID").equal(1)))