class defaultCase extends Annotation with StaticAnnotation
When materializing a GenCodec
for sealed hierarchy with @flatten
annotation, you can use this
annotation on one of case classes or objects to mark it as the default one. If during deserialization the
codec is unable to find the _case
field and determine the case class/object to deserialize, it will try to
deserialize the data to the class/object marked with this annotation.
This is useful for retaining backwards compatibility with serialized format when refactoring code and replacing a simple case class with a sealed hierarchy.
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