Hi All,
I have two classes, a Parent and a Child. (See below for code) The
Parent class contains a reference to a Child instance. However when I
try and save a Parent instance I get the following error: Cannot have
a java.lang.Long primary key and be a child object.
The error is clear enough and upon searching around I have found the
solution is to convert the primary key of my Child class to Key.
However this just does not sit well with me that I have to modify my
domain classes with proprietary google classes to suit the datastore.
Is there no other way to do this without resorting to custom APIs at
the domain level? Or is this a limitation of JDO and I need to do a
bit more research?
Cheers,
Carl.
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Parent {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private String name;
@Persistent
private Child child;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Child getChild() {
return child;
}
public void setChild(Child child) {
this.child = child;
}
}
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Child {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
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