I've 2 simple classes :
public class Student {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
com.google.appengine.api.datastore.Key key;
@Persistent
public String firstName;
@Persistent
public String lastName;
}
And
public class Teacher {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
com.google.appengine.api.datastore.Key key;
@Persistent
public String firstName;
@Persistent
public String lastName;
@Persistent
public com.google.appengine.api.datastore.Key student;
}
First, I create a Teacher with only the fields 'firstname' &
'lastname' filled. It works. Then, I update my teacher with this
code :
Transaction tx = pm.currentTransaction();
tx.begin();
Teacher a = pm.getObjectById(Teacher.class,
KeyFactory.stringToKey( the_key));
if(a != null) {
try {
a.setFirstName("test");
a.setLastName("test");
a.student = KeyFactory.stringToKey( req.getParameter("student101-
key"));
tx.commit();
}
}
pm.close();
}
}
After this transaction, the fields "firstname" & "lastname" are
correctly updated. However, the field "student" is still null. Do you
know Why?
Thank you very much
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