Query projection on a @Reference field

[Franklin Dattein]

Hi all,

is it possible to define a projection on @Reference objects?

This is what I have got:

@Entity
public class A  {

   @Reference(lazy=true)
   private Collection<B> collectionOfB; 

   ...

public class B  {

   private String name;
   private String desc;

And I want to retrieve only a sub-set of fields from B, so my DAO looks like this:

return createQuery()
        .field("_my_id").equal(myId)
        .retrievedFields(true,
                "collectionOfB.name"
        )
        .asList();


However, it doesn't work. Am I am missing something?

Thanks,
Franklin Dattein

[Justin Lee]

in order to do that, you'd have to do a join which mongodb does not support.  you'll have to do two separate queries to get what you want.

--------------------------------

{ name     : "Justin Lee", 

  title    : "Software Engineer",

  twitter  : "@evanchooly",

  web      : [ "mongodb.com", "antwerkz.com" ],

  location : "New York, NY" }

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