Simple Polymorphic Example

[theovier]

Hi,

I need some help with a basic polymorphic example.

Suppose we have 2 classes, Bar and Buzz which both implement the Foo interface. Code-wise this could look like this:

@Serializable
class Parent(val components: List<@Polymorphic Foo> = listOf())

interface Foo

@Serializable
class Bar(val name: String) : Foo

@Serializable
class Buzz(val id: Int) : Foo

Now let's assume the following XML:

<Parent>
    <Bar name="alice" />
    <Buzz id="1" />
</Parent>

With the above code I am unable to parse this XML file as I am hit with the UnknownXmlFieldException: Could not find a field for name Bar. What am I doing wrong here?

Thanks

[theovier]

After some digging I found this test case which shows exactly how to achieve this basic polymorphism.

[pdvrieze]

Sounds good. You do need to specify a module (there is an exception to that with the @XmlPolyChildren annotation that does basically the same (it was created when serializermodules didn't exist).