Id on nested documents are mapped to _id [DATAMONGO-2496]

provirus opened DATAMONGO-2496 and commented

Having the following classes:

@Document
class Parent {
  @Id
  private String id;

  private Child child;

  // Getters and setters
}

class Child {
  private Long id;
  private String name;

  // Getters and setters
}

Spring Data produces the following document:

{
  "_id": ...,
  "child": {
    "_id": 10,
    "name": "Foo"
  }
}

 
The expected document is:

{
  "_id": ...,
  "child": {
    "id": 10,
    "name": "Foo"
  }
}

Since there is no need for id mapping on the child document

Affects: 2.2.5 (Moore SR5)

Issue Links:

• DATACMNS-1714 Static Entity Metadata

Start by reproducing the mapping with the Parent and Child classes shown in the issue, comparing the nested document with the expected JSON. Trace the MongoDB mapping path that handles the child’s id and confirm that the parent still uses _id while the nested child retains id. Done means the reported nested output matches the expected document.