Support F# Discriminated Unions

[xperiandri]

Is your feature request related to a problem? Please describe.
I cannot use F# discriminated unions, in particular, single case unions as properties.

Describe the solution you'd like
Implement Gremlinq converted based on Newtonsoft's DiscriminatedUnionConverter

Additional context

[<Struct>]
type DomainID<'t> = private DomainID of Guid

type UzantoID = DomainID<Uzanto>
and Uzanto =
    { [<JsonProperty("id")>]
      ID : UzantoID
      PhoneHash : SingleLineText<PhoneHash>
...

[xperiandri]

Maybe I don't understand the serialization mechanism or I cannot find a way to transform property value to Gremlinq supported type before serialization?

[danielcweber]

Not sure what you are proposing I'm afraid

[xperiandri]

Let's have a look at DomainID type which is a wrapper around Guid

[Serializable, StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto, Size=1), Struct, 
public struct DomainID<t> : IEquatable<DomainID<t>>, IStructuralEquatable, IComparable<DomainID<t>>, IComparable, IStructuralComparable 
{
     internal Guid item;
     [CompilationMapping(SourceConstructFlags.UnionCase, 0)]
     internal static DomainID<t> NewDomainID(Guid item) =>
          new DomainID<t>(item);

     [CompilerGenerated, DebuggerNonUserCode]
     internal DomainID(Guid item)
     {
         this.item = item;
     }

     [CompilationMapping(SourceConstructFlags.Field, 0, 0), CompilerGenerated, DebuggerNonUserCode]
     internal Guid Item => this.item;
...

As you can see it is a wrapper struct that holds a single value and has phantom generic parameter to distinguish Id for different entities.
When saving it to Gremlin I need a mechanism to unwrap held value and when reading from Gremlin to wrap back.

[xperiandri]

How can Gremlinq be extended to support such a scenario?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[danielcweber]

You can see something similar here for TimeSpans-to-double and vice versa conversion. None of this has been released yet though.

[danielcweber]

This scenario is possible with the latest preview, see comment above.

[xperiandri]

Looks good, thanks!

[xperiandri]

@danielcweber could you point to the place where I can look at the sample now?