Repeated elements in collections are removed

[damiancalabresi]

Hi, In my case the entity Sharing has a list of User, the entity SharingDoc has an a list of userId.

public class Sharing extends BaseEntity{
  private List<User> sharedWith;
}

public class User extends BaseEntity {
  private Long id;
}

public class SharingDoc extends BaseEntity{
  private List<Long> sharedWith;
}

I have the following mapping:

mapperFactory.classMap(Sharing.class, SharingDoc.class)
  .field("sharedWith{id}", "sharedWith{}") // Test this!!
  .byDefault()
  .register();

I made a test where I create a Sharing entity with three users, the user.id are 1L, 2L and 2L (Yes, it's repeated)

Original Sharing:

{
  "sharedWith": [
    { "id": 1},
    { "id": 2},
    { "id": 2}
  ]
}

Mapped SharingDoc:

{
  "sharedWith": [
    1,
    2,
    2
  ]
}

I did the inverse mapping, so, the final Sharing entity is:

{
  "sharedWith": [
    { "id": 1},
    { "id": 2}
  ]
}

One user has disappeared. In some cases, it could be important.

[ndr-brt]

it happens when equal items are nearby, because MultiOccurrenceToMultiOccurrence verifies that item is different from the precedent item (due to some strange grouping specification, as listed in ExpanderTestCase).