Hi all, I have an issue where a value returned from a stream can either be an array or a string. Can't work out the correct syntax. I thought it would be a union. Has anyone else come across this?

th.Property(
            "meta_data",
                th.ArrayType(th.ObjectType(
                    th.Property("id", th.NumberType),
                    th.Property("key", th.StringType),
                    th.Property("value", Union[th.StringType, th.ArrayType])
                ))
        ),

Hi @jazzy. Yes, in concept it'd be a union or more concretely a JSON Schema

anyOf

. However, the SDK doesn't support using Python's built-in typing mechanisms (e.g.

Union

) to build the JSON Schema, so it relies entirely on its own type definitions and currently there is no way of declaring an

anyOf

type in there.

Thanks for the response that makes sense. Any suggestion for a quick fix to get around this issue?

You could declare a raw JSON schema without the helpers

{
  "type": "object",
  "properties": {
    "value": {
      "anyOf": [
        {"type": "string"},
        {"type": "array"},
      ]
    }
  }
}

@jazzy - What you can implement in JSON Schema isn't always the easiest to deal with downstream. What do you think of just making this an array and in the

post_process()

method you can conform a single string into an "array of 1 item"?

@aaronsteers Thanks for the response. I like the idea!