Identifier conversion not considered during `@DocumentReference` construction

Hi,

I use the new feature of document reference annotation @DocumentReference and have a issue about it. In case I have Country and City documents and City referenced to Country with this annotation. But “_Id” field of type on Country document is ObjectId. I write this code on City document as well:

@DocumentReference
private Country country;

When I get Country of City object it couldn’t fetch data and return null. Because of Country document reference stored as String type. I think there is a type mismatch on lookup query.

I think we need like 2 options on document reference.

1. dataType parameter on DocumentReference annotation class. (example : ObjectId, String …)
2. Or custom lookup field.

@DocumentReference(lookup = "{ '_id' : new ObjectId('?#{#target}') }")
private Country country;

or

@DocumentReference(lookup = "{ '_id' : { $oid: '?#{#target}' } }")
private Country country;

1. Spring should get the data type of referenced document and according to prepare lookup query

[blueiceprj]

Than you for your quick response

[blueiceprj]

Ok. Thank you.