```
@Documented
@Target(FIELD)
@Retention(RUNTIME)
public @interface PromptConfigJsonDiscriminator
```
Annotation for the discriminator field of a model class that represents the abstract base class of a discriminated union, intended for use with the JsonConfig mixin for prompt service handlers.
A discriminated union is a set of classes that share a common base class and are distinguished by a discriminator property. The discriminator property is a field in the base class that contains a value that indicates which subclass should be instantiated when deserializing a JSON object.
To properly serialize and deserialize discriminated unions, you must place the following 3 annotations:
- PromptConfigJsonDiscriminatedUnion on the base class, listing all subclasses that are part of the union.
- PromptConfigJsonDiscriminator on the discriminator property in the base class.
- PromptConfigJsonDiscriminatedUnionMember on each subclass, specifying the discriminator value for that subclass.
For example:
```
 @PromptConfigJsonDiscriminatedUnion({BananaSplit.class})
 public class Sweets {
   // other fields needed by this class
   @PromptConfigJsonDiscriminator
   protected String type;
 }

 @PromptConfigJsonDiscriminatedUnionMember("banana_split")
 public class BananaSplit extends Sweets {
   // other fields needed by this class
   public BananaSplit() {
       this.type = "banana_split";
   }
 }

 @PromptConfigJsonDiscriminatedUnionMember("apple_pie")
 public class ApplePie extends Sweets {
   // other fields needed by this class
   public ApplePie() {
    this.type = "apple_pie";
   }
 }
 
```
In this example, we'd expect the JSON object to contain the "type" field. If the field's value is "banana_split", then we should deserialize the object into an instance of the BananaSplit class, and if the field's value is "apple_pie", then we should deserialize the object into an instance of the ApplePie class.
Since:

8.5.0

Annotation Type PromptConfigJsonDiscriminator