CODEWITHSUNDEEP
javahibernatehibernate-mapping
Facundo Ch.
Facundo Ch.

Reputation: 12214

How to map @OneToMany to a java.util.Map with custom keys?

class A{

  private List<B> bs;

  ...
}

class B{

  private Long id;
  private String name;
  ...
}

And I'd like to have this:

class A{

  // the map should have B.name as key
  private Map<String,B> bs;

  ...
}

class B{
  private Long id;
  private String name;
  private A a;
  ...
}

I don't know if it is clear what I'd like to do, but it is as simple as mapping a one to many relationship to a Map with the name of B as the key of the map.

Thanks in advance, Neuquino

Upvotes: 1

Views: 1271

Answers (2)

Sid
Sid

Reputation: 4997

Google Collections has a class with this facility. Try it.

Upvotes: 0

sblundy
sblundy

Reputation: 61414

Try the hibernate annotation MapKey

@MapKey(name = "name")
@OneToMany()
private Map<String,B> bs;

Upvotes: 4

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