我对spring datarest有一个问题，对于下面定义的一个投影，当farmer id与farmer对象相同时，它只返回id，而不是返回farmer对象。对于具有id的farmer的第一个示例，返回object，所有其他示例都是only id。

@Projection(name = "customCocoonlot", types = { CocoonLot.class })
public interface CustomCocoonlot {

    @Value("#{target}")
    public CocoonLot getCocoonLot();

    @Value("#{target.getFarmerPayout()}")
    public FarmerPayout getFarmerPayout();

    @Value("#{target.getFarmer()}")
    public Farmer getFarmer();
}

下面是一个示例数据：

"cocoonlot": [
            {
                "cocoonLot": {
                    "id": 19,
                    "grade": 6.0,
                    "lotWeight": 1.0,
                    "pricePerKg": 360.0
                },
                "farmer": {
                    "id": 10,
                    "phone": "9999999999",
                    "name": "Test Farmer",
                }
            },
            {
                "cocoonLot": {
                    "id": 20,
                    "grade": 6.0,
                    "lotWeight": 2.0,
                    "pricePerKg": 360.0
                },
                "farmer": 10  --> ISSUE HERE
            }
        ]

但预期结果如下：

"cocoonlot": [
            {
                "cocoonLot": {
                    "id": 19,
                    "grade": 6.0,
                    "lotWeight": 1.0,
                    "pricePerKg": 360.0
                },
                "farmer": {
                    "id": 10,
                    "phone": "9999999999",
                    "name": "Test Farmer",
                }
            },
            {
                "cocoonLot": {
                    "id": 20,
                    "grade": 6.0,
                    "lotWeight": 2.0,
                    "pricePerKg": 360.0
                },
                "farmer": {
                    "id": 10,
                    "phone": "9999999999",
                    "name": "Test Farmer",
                }
            }
        ]