ObjectBox关系ToMany返回0，如何正确更新？

Question

def build_image(self, pdf_path, img_path):
    with wand.image.Image(filename=pdf_path) as img:
        img.save(filename=img_path)

我添加这样的产品

@Entity
public class Shop{

    @Id(assignable = true)
    long id;

    @Backlink(to = "shop")
    public ToMany<Product> products;
}


@Entity
public class Product{

    @Id(assignable = true)
    long id;

    public ToOne<Shop> shop;

    double price;
}

但是当我更新产品价格并再次更新

List<Shop> values = get using api;
getShopBox().put(values);
getShopBox().getAll();// works

当我从数据库中检索时，它返回ToMany 0的大小