Please use the user forum for such questions http://forum.hibernate.org
Bear Giles wrote:
Augh!
I have three classes with approximately a three-way many-to-many relationship. Each "facility" can have multiple "contracts" and "accounts." Each "contract" may serve multiple "facilities." For modelling I can have each "account" have multiple "contracts" and "facilities". That's easy to model with a join table with one-to-many relationships with all three classes. BTW in the problem domain I'm usually only looking at only two of the elements at any time.
In practice each account has one "facility" and one "contract." In fact, the join table for the many-to-many facility x contract _is_ an "account," in the problem domain. Aha, an obvious solution that ensures domain semantics! - I just augment the join table with additional fields.
Is it possible to do what I want to do? Specifically I would like to have:
contract: Set accounts (one-to-many, from accounts) Set contracts (many-to-many, via accounts)
facility: Set accounts (one-to-many, from accounts) Set contracts (many-to-many, via accounts)
account: Long accountId Long contractId (many-to-one to contracts) Long facilityId (many-to-one to facilities)
where both sets are properly handled by hibernate? Access methods can ensure that all sets are properly updated, and I assume I would need to set "update=false, insert=false" on the many-to-many sets.
All of my efforts today have resulted in either having contractId or facilityId set not null, or artifically inserting an 'elt' field.
Thanks,
Bear
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-- Emmanuel Bernard [EMAIL PROTECTED] callto://emmanuelbernard
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