How to handle literal interface instances? #69
Description
I frequently need to use the interface object expressions feature when referring to types that come from abstracted core libraries as properties in concrete types.
However, it seems that these types are not serializable in FSharp.Json. E.g.:
#r "nuget: FSharp.Json"
open FSharp.Json
type IThing =
abstract member value: int
type Thing = { innerThing: IThing }
{
innerThing =
{ new IThing with
member _.value = 1
}
}
|> Json.serializeyields
FSharp.Json.JsonSerializationError: Unknown type: IThing
at FSharp.Json.Core.serializeNonOption@104(JsonConfig config, Type t, JsonField jsonField, Object value)
at FSharp.Json.Core.serializeUnwrapOption@158(JsonConfig config, Type t, JsonField jsonField, Object value)
at FSharp.Json.Core.serializeProperty@180-1.Invoke(PropertyInfo prop)
at FSharp.Json.Core.serializeRecord@216(JsonConfig config, Type t, Object therec)
at FSharp.Json.Json.serializeEx(JsonConfig config, Object theobj)
at <StartupCode$FSI_0002>.$FSI_0002.main@() in C:\a.fsx:line 10
at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
Is there a way to configure this behavior? Either pass in a serializing function or simply mark these fields to be skipped?