Annotating object relationships

dhosek · **Joined:** Sun Jul 27, 2008 4:23 am **Posts:** 10

OK, I have the following objects

InsuranceSearchData
Driver
Vehicle
Incident

InsuranceSearchData can have zero or more Drivers (List<Driver>), and zero or more Vehicles (List<Vehicle>).

A Vehicle has a primary driver and a list of zero or more secondary drivers (List<Driver>), but should be able to be saved before the primary driver is set.

A Driver as zero or more incidents (List<Incident>)

For business reasons, the data should be able to be saved to the database as information is entered, which means that a Vehicle will be saved before its drivers are set, a Drier will be saved before its incidents are set, etc.

The schema is auto-generated using hibernatetool

I'd annotated them as follows (leaving out much of the other detail):

Code:

InsuranceSearchData:

@CollectionOfElements
private List<Driver>               driverList;
@CollectionOfElements
private List<Vehicle>             vehicleList;

Driver:

@OneToMany
private List<Incident>              incidentList; 

Vehicle:
@ManyToOne
private Driver primaryDriver;
@ManyToMany
private List<Driver> secondaryDriver;

I'm assuming I need some additional annotations to make everything work. Any ideas here?[/code]

hardy.ferentschik · **Posted:** Thu Jul 31, 2008 4:05 am

Hi,

any particular problem you are facing? The provided annotations seems reasonable and could of course be extended, for example with cascading options or further constraints, ...
Is it something particular you are after or do you have a problem to get it to work at all?

--Hardy

dhosek · **Joined:** Sun Jul 27, 2008 4:23 am **Posts:** 10

I somehow got double-posted and put a follow-up on the other posting:
http://forum.hibernate.org/viewtopic.php?t=989197 where I have the full error.

I think it might be a question of setting up cascades, although my first attempt (putting an @Cascade annotation on the List<Vehicle> doesn't seem to work. When I get into the office, I can try putting the info there.

-dh

Cameron McKenzie · **Posted:** Fri Aug 01, 2008 9:50 am

Indeed, I would think that the CascadeType option would do the trick.

Good luck, and thanks for the update!

dhosek · **Joined:** Sun Jul 27, 2008 4:23 am **Posts:** 10

It turned out to be a conflict between some annotations being imported from javax.persistence and others being imported from org.hibernate.annotations