Hi again,
I've just worked out that the problem is related to the gae.pk-name
field.
I though that the child encoded key string was set based on the pk-name
field only if the encoded key field was null, instead it is set every
time the object is written for the first time to the datastore,
overriding the encoded key I set to put the second child in the same
entity group of the parent.
Hope I've been clear...!! :-)
Shouldn't the encoded key string be left unchanged if already set???
Is this bug??
Have I missed something??
Regards,
Patrizio
Patrizio Munzi wrote:
Hi all,
I found another strange (unexpected behavior for me) with my two simple
Parent and Child classes and Entity Groups.
ASAIK in a transaction can be manipulated any object as long as they
belong to the same entity group.
Now, I cannot understand why I'm getting a Fatal exception when I try
to persist in a transaction an object for whom I set the encoded key as
child of the same parent.
Snippet in the following.
Hope, Someone can help!
Thanks
Here's the snippet and my classes:
-----------------
SNIPPET ------------------------------
public void testTransactions() {
String parentId = "parent";
String childId_1 = "child-1";
String childId_2 = "child-2";
PersistenceManager pm = PMF.get().getPersistenceManager();
pm.currentTransaction().begin();
Parent parent = new Parent();
parent.setId(parentId);
Child child = new Child();
child.setId(childId_1);
child.setValue(100);
parent.setChild(child);
pm.makePersistent(parent);
pm.currentTransaction().commit();
pm.close();
pm = PMF.get().getPersistenceManager();
pm.currentTransaction().begin();
String parentEncodedKey =
KeyFactory.createKeyString(Parent.class.getSimpleName(), parentId);
parent = pm.getObjectById(Parent.class, parentEncodedKey);
assertEquals(100, parent.getChild().getValue());
parent.getChild().setValue(1000);
child = new Child();
child.setId(childId_2);
Key child2Key =
KeyFactory.createKey(KeyFactory.stringToKey(parentEncodedKey),
Child.class.getSimpleName(), childId_2);
child.setEncodedKey(KeyFactory.keyToString(child2Key));
child.setValue(10);
pm.makePersistent(child);
pm.makePersistent(parent);
pm.currentTransaction().commit();
pm.close();
pm = PMF.get().getPersistenceManager();
pm.currentTransaction().begin();
parentEncodedKey =
KeyFactory.createKeyString(Parent.class.getSimpleName(), parentId);
parent = pm.getObjectById(Parent.class, parentEncodedKey);
assertEquals(1000, parent.getChild().getValue());
pm.currentTransaction().commit();
pm.close();
}
-----------------------------------------------
---------------- PARENT -------------------------------
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Parent implements Serializable {
private static final long serialVersionUID = -3051163582728562957L;
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
protected String encodedKey;
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-name",
value="true")
private String id;
@Persistent(defaultFetchGroup="true")
@Element(dependent="true")
private Child child;
public String getEncodedKey() {
return encodedKey;
}
public void setEncodedKey(String encodedKey) {
this.encodedKey = encodedKey;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Child getChild() {
return child;
}
public void setChild(Child child) {
this.child = child;
}
}
-----------------------------------------------
------------------- CHILD ----------------------------
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Child implements Serializable {
private static final long serialVersionUID = -3051163582728562957L;
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
protected String encodedKey;
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-name",
value="true")
private String id;
@Persistent
private long value;
public String getEncodedKey() {
return encodedKey;
}
public void setEncodedKey(String encodedKey) {
this.encodedKey = encodedKey;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public long getValue() {
return value;
}
public void setValue(long value) {
this.value = value;
}
}
-----------------------------------------------
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