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Id in domain model in case when natural id is unavailable
Techniques for dealing with anemic domain modelCorrect use of flush() in JPA/Hibernate.NET Domain Model validation and Buddy ClassesRich Domain Model and ORMUsing my own domain model objects with .edmx in Entity FrameworkDoctrine Entities and business logic in a Symfony applicationRepository pattern and mapping between domain models and Entity FrameworkHow to write domain logic for a domain model in Domain Driven Design?Persistance ID's and Domain Model EntitiesHaving Separate Domain Model and Persistence Model in DDD
Let's say I have a domain model with no natural id.
class Offer
ClientId clientId;
CompanyId companyId;
OfferDetails details;
Offer is loaded from database by auto-generated key. Then it is modifed e.g. by calling a business method accept, reject or renegotiate. In order to persist the offer I must have this auto-generated key. How should I connect domain entity and id from db? Right now I have an OfferId class with db id and version (I use JPA to persist the aggregate). Is there any better approach?
domain-driven-design persistence
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
add a comment |
Let's say I have a domain model with no natural id.
class Offer
ClientId clientId;
CompanyId companyId;
OfferDetails details;
Offer is loaded from database by auto-generated key. Then it is modifed e.g. by calling a business method accept, reject or renegotiate. In order to persist the offer I must have this auto-generated key. How should I connect domain entity and id from db? Right now I have an OfferId class with db id and version (I use JPA to persist the aggregate). Is there any better approach?
domain-driven-design persistence
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
add a comment |
Let's say I have a domain model with no natural id.
class Offer
ClientId clientId;
CompanyId companyId;
OfferDetails details;
Offer is loaded from database by auto-generated key. Then it is modifed e.g. by calling a business method accept, reject or renegotiate. In order to persist the offer I must have this auto-generated key. How should I connect domain entity and id from db? Right now I have an OfferId class with db id and version (I use JPA to persist the aggregate). Is there any better approach?
domain-driven-design persistence
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
Let's say I have a domain model with no natural id.
class Offer
ClientId clientId;
CompanyId companyId;
OfferDetails details;
Offer is loaded from database by auto-generated key. Then it is modifed e.g. by calling a business method accept, reject or renegotiate. In order to persist the offer I must have this auto-generated key. How should I connect domain entity and id from db? Right now I have an OfferId class with db id and version (I use JPA to persist the aggregate). Is there any better approach?
domain-driven-design persistence
domain-driven-design persistence
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
asked Mar 7 at 20:12
Julian RubinJulian Rubin
636617
636617
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Right now I have an OfferId class with db id and version
The version shouldn't be part of the ID. The ID needs to be immutable.
There are several strategies to deal with ID generation, but here's the common ones:
- Use a GUID which relieves the need to hit a shared data store to generate the ID.
Implement a
nextId(): OfferIdoperation on your repository (implementation could use a DB sequence, etc.):Offer offer = new Offer(offerRepo.nextId(), ...);- Allow the
Offerclass to be instantiated without an ID and configure your ORM to generate one. I'm not entirely sure about the JPA spec, but it seems that in Hibernate you can combine@IdClassand@GenerateValueannotations to map a DB-generated identity to a wrapping ID class. Have a look at this test case.
Honestly I dislike delegating the identity assignation/generation to the ORM. If you want to generate the ID from the DB I would suggest the second approach I've described, with a method on the repository (or a dedicated service) that can return the next ID.
answered Mar 8 at 14:29
plalxplalx
33.2k44770
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer withinOfferand let it be managed by the ORM. You can declare that field in a layer supertype, such asEntityrather than polluting all model classes.Offer extends Entity.
– plalx
Mar 8 at 14:46
add a comment |
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1 Answer
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Right now I have an OfferId class with db id and version
The version shouldn't be part of the ID. The ID needs to be immutable.
There are several strategies to deal with ID generation, but here's the common ones:
- Use a GUID which relieves the need to hit a shared data store to generate the ID.
Implement a
nextId(): OfferIdoperation on your repository (implementation could use a DB sequence, etc.):Offer offer = new Offer(offerRepo.nextId(), ...);- Allow the
Offerclass to be instantiated without an ID and configure your ORM to generate one. I'm not entirely sure about the JPA spec, but it seems that in Hibernate you can combine@IdClassand@GenerateValueannotations to map a DB-generated identity to a wrapping ID class. Have a look at this test case.
Honestly I dislike delegating the identity assignation/generation to the ORM. If you want to generate the ID from the DB I would suggest the second approach I've described, with a method on the repository (or a dedicated service) that can return the next ID.
answered Mar 8 at 14:29
plalxplalx
33.2k44770
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer withinOfferand let it be managed by the ORM. You can declare that field in a layer supertype, such asEntityrather than polluting all model classes.Offer extends Entity.
– plalx
Mar 8 at 14:46
add a comment |
Right now I have an OfferId class with db id and version
The version shouldn't be part of the ID. The ID needs to be immutable.
There are several strategies to deal with ID generation, but here's the common ones:
- Use a GUID which relieves the need to hit a shared data store to generate the ID.
Implement a
nextId(): OfferIdoperation on your repository (implementation could use a DB sequence, etc.):Offer offer = new Offer(offerRepo.nextId(), ...);- Allow the
Offerclass to be instantiated without an ID and configure your ORM to generate one. I'm not entirely sure about the JPA spec, but it seems that in Hibernate you can combine@IdClassand@GenerateValueannotations to map a DB-generated identity to a wrapping ID class. Have a look at this test case.
Honestly I dislike delegating the identity assignation/generation to the ORM. If you want to generate the ID from the DB I would suggest the second approach I've described, with a method on the repository (or a dedicated service) that can return the next ID.
answered Mar 8 at 14:29
plalxplalx
33.2k44770
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer withinOfferand let it be managed by the ORM. You can declare that field in a layer supertype, such asEntityrather than polluting all model classes.Offer extends Entity.
– plalx
Mar 8 at 14:46
add a comment |
Right now I have an OfferId class with db id and version
The version shouldn't be part of the ID. The ID needs to be immutable.
There are several strategies to deal with ID generation, but here's the common ones:
- Use a GUID which relieves the need to hit a shared data store to generate the ID.
Implement a
nextId(): OfferIdoperation on your repository (implementation could use a DB sequence, etc.):Offer offer = new Offer(offerRepo.nextId(), ...);- Allow the
Offerclass to be instantiated without an ID and configure your ORM to generate one. I'm not entirely sure about the JPA spec, but it seems that in Hibernate you can combine@IdClassand@GenerateValueannotations to map a DB-generated identity to a wrapping ID class. Have a look at this test case.
Honestly I dislike delegating the identity assignation/generation to the ORM. If you want to generate the ID from the DB I would suggest the second approach I've described, with a method on the repository (or a dedicated service) that can return the next ID.
answered Mar 8 at 14:29
plalxplalx
33.2k44770
Right now I have an OfferId class with db id and version
The version shouldn't be part of the ID. The ID needs to be immutable.
There are several strategies to deal with ID generation, but here's the common ones:
- Use a GUID which relieves the need to hit a shared data store to generate the ID.
Implement a
nextId(): OfferIdoperation on your repository (implementation could use a DB sequence, etc.):Offer offer = new Offer(offerRepo.nextId(), ...);- Allow the
Offerclass to be instantiated without an ID and configure your ORM to generate one. I'm not entirely sure about the JPA spec, but it seems that in Hibernate you can combine@IdClassand@GenerateValueannotations to map a DB-generated identity to a wrapping ID class. Have a look at this test case.
Honestly I dislike delegating the identity assignation/generation to the ORM. If you want to generate the ID from the DB I would suggest the second approach I've described, with a method on the repository (or a dedicated service) that can return the next ID.
answered Mar 8 at 14:29
plalxplalx
33.2k44770
answered Mar 8 at 14:29
plalxplalx
33.2k44770
answered Mar 8 at 14:29
plalxplalx
33.2k44770
answered Mar 8 at 14:29
plalxplalx
33.2k44770
33.2k44770
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer withinOfferand let it be managed by the ORM. You can declare that field in a layer supertype, such asEntityrather than polluting all model classes.Offer extends Entity.
– plalx
Mar 8 at 14:46
add a comment |
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer withinOfferand let it be managed by the ORM. You can declare that field in a layer supertype, such asEntityrather than polluting all model classes.Offer extends Entity.
– plalx
Mar 8 at 14:46
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
I like nextId approach. How would You suggest handling version?
– Julian Rubin
Mar 8 at 14:38
@JulianRubin Just use an integer within
Offer and let it be managed by the ORM. You can declare that field in a layer supertype, such as Entity rather than polluting all model classes. Offer extends Entity.– plalx
Mar 8 at 14:46
@JulianRubin Just use an integer within
Offer and let it be managed by the ORM. You can declare that field in a layer supertype, such as Entity rather than polluting all model classes. Offer extends Entity.– plalx
Mar 8 at 14:46
add a comment |
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