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Embeddable object with an ElementCollection that contains Embeddable objects

Description

I have the following objects

@Entity(name = "someClass")
public class SomeClass()
{
    @Embedded
    private EmbeddedObject embeddedObject;
}

@Embeddable
public class EmbeddedObject ()
{
    @ElementCollection
    private List<ListElement> listElements;
}

@Embeddable
public class ListElement()
{
    private String name;

    private String value;
}

I was expecting the Mongo object would look like this:

{
    "embeddedObject": {
        "listElements":
        [
            {
                "name": "someName",
                "value": "someValue"
            }
        ]
    }
}

Instead it looks like this (which is not desired):

{
    "embeddedObject": {
        "listElements":
        [
            {
                "listElements": {
                    "name": "someName",
                    "value": "someValue"
                }
            }
        ]
    }
}

I can achieve the desired situation as follows:

@Entity(name = "someClass")
public class SomeClass()
{
    @ElementCollection
    private List<ListElement> listElements;
}

However, this is not the way I want to store the objects.

Environment

Hibernate HQL: 1.2.0.Final Hibernate OGM: 5.0.0.Final Hibernate OGM MongoDB: 5.0.0.Final MongoDB Java Driver: 3.4.1

Attachments

31 Mar 2018, 02:07 PM
31 Mar 2018, 01:59 PM

Activity

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Michael Wirth March 31, 2018 at 2:08 PM

I have the same issue. I really wonder why this issue hasn't come up earlier with more attention as having an ElementCollection in an Embeddable doesn't sound to be an exotic use case. Attention: this is not related having a nestedn ElementCollection in another ElementCollection.

Digging into the code I found the causing issue in the TypeHelper.class in Line 240. The recursive call has no effect at all, as it just copies the values into a new Object array, but doesn't process the result. A quick test showed that the issue can be fixed by applying the result values to the containing object:

Object[] values = replaceAssociations(origComponentValues, targetComponentValues, subtypes, session, (Object) null, copyCache, foreignKeyDirection);
componentType.setPropertyValues(target[i], values, null);

Details

Assignee

Unassigned

Reporter

MartijnP

Labels

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Bug Testcase Reminder (edit)

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Participants

MartijnP

Michael Wirth

Components

mongodb

Affects versions

5.0.4.Final

Priority

Minor

Created March 1, 2017 at 1:25 PM

Updated March 31, 2018 at 2:08 PM

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