Serializer doesn't serialize nested objects correctly

[ghost]

{
    "id": 51,
    "name": "Nathan",
    "car": {
        "id": 4,
        "name": "My Car",
        "passengers": [
            {
                "id": 8,
                "user": {
                    "id": 55,
                    "name": "User1"
                }
            },
            {
                "id": 9
            },
            {
                "id": 10,
                "user": {
                    "id": 41,
                    "name": "User1"
                }
            }
        ]
    }
}

I'm attempting to serialize a user object, this user object has a relation to 'car' which holds other 'user' entities. The problem is that id 9 is myself, and it will not print the whole user out.

If I turn on displaying null values, 'user' is set to null, like so:

            {
                "id": 9,
                "user": null
            }

[ghost]

I've notices if I

clone $this->getUser()

it outputs my JSON correctly.

[schmittjoh]

The serializer automatically prevents endless recursion and skips over all objects which it is currently visiting.

If you want your user object to be visited twice (as root and as part of a nested collection), then cloning at the moment is the only way to achieve that.