How can I convert a spring DBRef to a DBObject

[Geoffry Colin]

Hope this is a quick question. I can find nothing on it after much Googling.

I'm using spring's mongo stuff.

How can I convert/cast a spring DBRef to a DBObject?

I have a class that has a collection of DBRefs:

@DBRef
	private Set<Message> children = new HashSet<Message>();

At some point, I must iterate and access them:

BasicDBList messagesDBObjects = (BasicDBList) source.get("children");
		for (Object childObj : messagesDBObjects) {
			DBObject child = ((DBRef) childObj).fetch();  //This used to work, but became deprecated and has since been removed. 
                }

What can one do in lieu of the deprecated fetch()?

Thanks in advance.

[arumugarani sundaram]

Hi,

Actually a BasicDBObject class is a list of Objects.
While querying you can directly cast to a DBObject. if you are not sure about what the object is, then you can add check whether the object is instanceOf DBObject.

BasicDBList messagesDBObjects = (BasicDBList) source.get("children");
        for (Object childObj : messagesDBObjects) {
             DBObject dbObj=(DBObject) childObj;
       }
 

if you are not sure about what the object is, then you can add check whether the object is instanceOf DBObject as below

BasicDBList messagesDBObjects = (BasicDBList) source.get("children");
        for (Object childObj : messagesDBObjects) {
              if (childObj instanceof DBObject){
                  DBObject dbObj=(DBObject) childObj;
             }
        }
 

Thanks,
Arumugarani

[Geoffry Colin]

I'm not following. In my example the DBList is a list of DBRefs these are not DBObjects and casting does not work.
Am I reading you correctly?

BasicDBList messagesDBObjects = (BasicDBList) source.get("children");
        for (Object childObj : messagesDBObjects) {
             DBObject dbObj=(DBObject) childObj; // Yields a class cast exception.

       }