Using mixin within a listing

[aka-mj]

I'm defining a Listing and want to use a Mixin to add properties to certain entries but not sure how to structure this or if it's possible.

// Cloud-to-Device settings
class C2DSetting {
	path: String(length < 54)
	id: UInt16
}

convertDatetimeToEpoch: Mixin<C2DSetting> = new {
	convertTo = "datetime2Epoch"
}

c = new Listing {
	local p: C2DSetting = new {
	  path = "abc"
	  id = 1
	}
	(p |> convertDatetimeToEpoch)
}

Also tried something more inline which also doesn't work.

c = new Listing {
	new C2DSetting {
	  path = "abc"
	  id = 1
	} |> convertDatetimeToEpoch
}

[odenix]

A mixin cannot add a new property to a class, if that's what you're trying to do.