how to serialize and deserialize object hierarchy with jsony

[pietroppeter]

• object A
• object B inherits from A (and a field more)
• object C has a sequence of A child objects as field
• object D also inherits from A (and another field)
• how to serialize and deserialize all of those with jsony

see https://github.com/pietroppeter/nimib/issues/168 for first POC

trick:

• have a special field kind in the base object that will be used to specialize serializationa and deserialization

papercut for current solution:

• you need a global object
• you need to register types in this global object

for nimib the papercut is not so bad:

• we already have a global object
• we can hide the registration in templates for making blocks

could be later a issue/PR for jsony