This is an example showing how to convert JSON objects into and from an abstract base class.
The basket in our example holds a list of abstract foods which can a fruit or meat concretely.
To convert the basket JSON to an instance in our project we extend from the JsonConverter in FoodConverter.
The key point is having a field (Food::type) in our abstract class to determine the actual type of data we have to convert to and from.
There are other options to deal with abstract types in JSON, but this is how it's done this way.