Can I have dynamic types in arrays, e.g. dsl.ArrayOf(dsl.AnyOf(TypeA, TypeB))?

[gabyx]

I have an array which I want to represent in Goa DSL:

- id: 1
  type: banana
  monkey: true
  
- id: 3
  type: orange 
  ripe: true

Can I represent such a type in Goa with the DSL? I did not find anything related to this?
Does that even exist?

Not even sure its even possible to represent that in Go easily...

Thanks a lot

[raphael]

Edit: I see the title now and clearly the question is about having a polymorphic array.

As you've probably realized AnyOf applies to type attributes and does not itself create a type. So the closest you could do is define a type which has AnyOf attributes and use that type to define the array elements. Alternatively it's always possible to define a type that defines the full closure of all possible attributes and add a selector field. The client is then responsible for checking the selector and using the attributes that apply.

[gabyx]

Jeah correct, thats what I want, but AnyOf or the sort is an imaginary thing right? It does not exist in Goa?
The selector thing would work how?

[raphael]

Yes that's right there's OneOf which can be used on attributes and might help here, given the example it's possible to do something like:

var Fruit = Type("Fruit", "A fruit", func() {
    Attribute("id", Int, func() {
        Description("Attribute unique identifier")
        Example(42)
        Min(1)
     })
    Attribute("type", String, func() {
        Description("Fruit type")
        Enum("banana", "orange")
        Default("banana")
    })
    OneOf("properties", "Fruit type specific properties", func() {
        Attribute("orange", "Orange properties", OrangeProperties)
        Attribute("banana", "Banana properties", BananaProperties)
    })
})

var OrangeProperties = Type("OrangeProperties", "Orange properties", func() {
// ....
})

var BananaProperties = ...