Generating values for dependent fields

[AV-29A]

Sometimes we need consistency of data, some requirements of business logic.
For example

List<TestObject> iestObject = Instancio.ofList(TestObject.class)
        .size(10)
        .onComplete(Select.field(TestObject::getTestObjectItems), o -> {
        //for example at this time need know parent object id
        //Something like this 
        o.setId(parentObj.getId() + “-” + {some generated value});
        //Sometimes we need object tree for make consistency data.
    })
 .create();

I wrote some code.
From InstancioEngine to the CallbackHandler I send some useful values.
And as the result callback invoke looks like this:

    private static void invokeCallback(final OnCompleteCallback<?> callback,
                                       final Object result,
                                       final InternalNode node,
                                       final InstancioEngine engine,
                                       GeneratorResult generatorResult
    ) {
            ((OnCompleteNodeCallback) callback).onComplete(result, node, engine, generatorResult);
 }

}
It’s just a scratch, maybe we can discus, right approach for this functionality?
And then I contribute may pull request.

[armandino]

If I understood correctly, the item ID value depends on the parent ID value. You should be able to achieve this using the assign() method:

Supplier<String> someGeneratedValue  = () -> Gen.string().prefix("CHILD_ID_").get();

List<TestObject> list = Instancio.ofList(TestObject.class)
    .size(10)
    .assign(Assign.valueOf(TestObject::getId)
            .to(TestObjectItem::getId)
            .as(parentId -> parentId + "_" + someGeneratedValue.get()))
    .create();

Sample output:

TestObject(id=MCK, testObjectItems=[TestObjectItem(id=MCK_CHILD_ID_WQXBFRWWAD), TestObjectItem(id=MCK_CHILD_ID_ZAPKYC)])
TestObject(id=DLSIMYUKT, testObjectItems=[TestObjectItem(id=DLSIMYUKT_CHILD_ID_KYKEBIHY), TestObjectItem(id=DLSIMYUKT_CHILD_ID_QDJL)])
...

Please see https://www.instancio.org/user-guide/#using-assign for details.

[AV-29A]

This is it!
Thank you!