Hi,
I have a question on nested Entity class using JPA framework on appengine. I
have code liek this..
@Entity
public class MyDataObject {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Key key;
// some persistent fields of standatd types
@Basic
@OneToOne(cascade={CascadeType.PERSIST,CascadeType.REFRESH,CascadeType.REMOVE})
List<SmartItem>data;
// standard getters/setters
}
One of the fields above is "data" which is a collection of a another Entity
class SmartItem.
@Entity
public class SmartItem implements java.io.Serializable{
private static final long serialVersionUID = 4428700412206745337L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
Key key;
public Key getKey() {
return key;
}
//bunch of persistent fields
}
Key key =
KeyFactory.createKey(MyDataObject.class.getSimpleName(), newData.deviceId);
newData.key = key;
em.persist(newData);
//em.merge(newData);
When I call em.persist for first time, the data is saved correctly. I see a
list of my "SmartItem" objects in the datastore. When I call em.persist
again for the same entiry MyDataObject, the SmartItems are "appended" and
not "replaced". Ex: First item I have my <List> data as "list1", "list2".
Next I add "list3" to my list and call em.persist(..). Now I see "list1",
"list2", "list1", "list2", "list3" items. Tried em.merge and still same
behavior.
Anyone has suggestions? When I call em.persist(), I would like my nested
Entity field item List<SmartItem> data to just contain the new list and not
the old entities..
Thanks
Neeli
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