Hey,
I currently resolve circulare dependencies with JsonIdentityInfo and new
generated UUID. I would like use existing primary key. My problem is that
my PK is a composite key of normally two attributes (String or int) "id"
and "version". I cannot change the classes because of 3rd party lib. I can
only use Mixin or something else.
public class Parent {
// this is my identiy composite key
ParentPK pk;
String bez;
Date created;
Child child;
// constructor, getter and setter
}
public class ParentPK {
int parentId;
int version;
// constructor, getter and setter
}
public class Child {
String childId;
Parent parent;
// constructor, getter and setter
}
How can I use my ParentPK as identity in Jackson? I've tried to use
JsonIdentityInfo in combination with virtual attributes and JsonAppend. But
his won't work because the property does not exist in POJO. In my mind I've
several ideas as solutions but don't know whether they can implemented in
Jackson:
- Use existing ParentPK JSON representation e.g. {id:"99", version:"v1"}
as JsonIdentityInfo and use equals method in Jackson to compare objects
will be the best because no additional attribute will be added to parent.
But I don't know whether custom objects are possible as identity?
- Create virtual String attribute "compositeKey" e.g. "99-v1 and use it
as JsonIdentityInfo. But the virtual attribute via JsonAppend cannot be
used in combination with JsonIdentityInfo.
Have anyone an idea to implement this?
Thx
Thomas
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