Morphia&MongoDB通过REST在JSON返回类型中的问题

Question

@Entity(value = "orgs", noClassnameStored = true)
public class Org
{
    @Id
    @Property("id")
    private ObjectId id;
    private String name = null;
    // Some other properties

    // Getter/Setter for Object ID
    public ObjectId getId(){return id;}
    public void setId(ObjectId id){this.id = id;}

    // Getter & Setter for name...
    // the other Getter & Setter methods
}

@POST
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Org createOrg(Org org)
{
    Morphia morphia = new Morphia();
    morphia.mapPackage("com.dgfx.entity");

    try
    {
        Datastore ds = morphia.createDatastore(MongoDBHelper.getMongoClient(), "dgfx-admin");
        ds.save(org);
        System.out.println("org name = " + org.getName() + ", id = " + org.getId()); // Prints the new Org ID perfectly fine!!!
        return org;

    } catch (UnknownHostException e)
    {
        e.printStackTrace();
        return null; //TODO: Better return type
    }
}

c.POST请求（使用Postman和contenttype：application/json）...

{
    "altName": "",
    "levels": [],
    "name": "My Organisation",
    "parentId": "",
    "shortName": "",
    "type": ""
}

d.执行POST后，MongoDB集合中的数据看起来很好...

> db.orgs.find();
{ "_id" : ObjectId("56a9462902c3192d88d64bc3"), "type" : "", "name" : "My Organisation", "altName" : "", "shortName" : "", "parentId" : "" }
{ "_id" : ObjectId("56a9464b02c3192d8845d128"), "type" : "", "name" : "Ecosys Clover", "altName" : "", "shortName" : "", "parentId" : "" }

E.一切都像魅力一样工作，直到这里，SysOut打印出组织新创建的ID...

ds.save(org);
System.out.println("org name = " + org.getName() + ", id = " + org.getId()); // Prints the new Org ID perfectly fine!!!

{
  "altName": "",
  "id": {},
  "levels": [],
  "name": "My Organisation",
  "parentId": "",
  "shortName": "",
  "type": ""
}

null

感激任何帮助和提前感谢...

SG

Answer 1

所有的，

这并不是一个如何解决问题的答案，而是一个变通办法。

1. 我使用的是字符串ID而不是objectid ID
2. 在对象构造函数中，我创建了一个新的ObjectId并将其分配给字段。
3. 在更新对象时，我重新分配字符串id，以确保_id保持不变，并且更新了对象，而不是创建新的对象。