Cope with unit type in JSON (#262)

ConsumePlugin/GeneratedSerde.fs

@@ -210,6 +210,8 @@ module JsonRecordTypeWithBothJsonSerializeExtension =
                      |> (fun field -> field.ToString "o" |> System.Text.Json.Nodes.JsonValue.Create<string>))
                 )
 
+                node.Add ("unit", (input.Unit |> (fun value -> System.Text.Json.Nodes.JsonObject ())))
+
             node :> _
 namespace ConsumePlugin
 
@@ -478,6 +480,8 @@ module JsonRecordTypeWithBothJsonParseExtension =
 
         /// Parse from a JSON node.
         static member jsonParse (node : System.Text.Json.Nodes.JsonNode) : JsonRecordTypeWithBoth =
+            let arg_21 = ()
+
             let arg_20 =
                 (match node.["timestamp"] with
                  | null ->
@@ -759,6 +763,7 @@ module JsonRecordTypeWithBothJsonParseExtension =
                 IntMeasureNullable = arg_18
                 Enum = arg_19
                 Timestamp = arg_20
+                Unit = arg_21
             }
 namespace ConsumePlugin
 

ConsumePlugin/SerializationAndDeserialization.fs

@@ -50,6 +50,7 @@ type JsonRecordTypeWithBoth =
         IntMeasureNullable : int<measure> Nullable
         Enum : SomeEnum
         Timestamp : DateTimeOffset
+        Unit : unit
     }
 
 [<WoofWare.Myriad.Plugins.JsonSerialize true>]

WoofWare.Myriad.Plugins.Test/TestJsonSerialize/TestJsonSerde.fs

@@ -117,6 +117,7 @@ module TestJsonSerde =
                     IntMeasureNullable = intMeasureNullable
                     Enum = enum<SomeEnum> someEnum
                     Timestamp = timestamp
+                    Unit = ()
                 }
         }
 
@@ -168,6 +169,7 @@ module TestJsonSerde =
                 IntMeasureNullable = Nullable -883<measure>
                 Enum = enum<SomeEnum> 1
                 Timestamp = DateTimeOffset (2024, 07, 01, 17, 54, 00, TimeSpan.FromHours 1.0)
+                Unit = ()
             }
 
         let expected =
@@ -198,7 +200,8 @@ module TestJsonSerde =
     "intMeasureOption": 981,
     "intMeasureNullable": -883,
     "enum": 1,
-    "timestamp": "2024-07-01T17:54:00.0000000\u002B01:00"
+    "timestamp": "2024-07-01T17:54:00.0000000\u002B01:00",
+    "unit": {}
 }
 """
             |> fun s -> s.ToCharArray ()

WoofWare.Myriad.Plugins/JsonParseGenerator.fs

@@ -280,6 +280,7 @@ module internal JsonParseGenerator =
             parseNumberType options propertyName node primType
             |> SynExpr.pipeThroughFunction (Measure.getLanguagePrimitivesMeasure primType)
         | JsonNode -> node
+        | Unit -> SynExpr.CreateConst ()
         | _ ->
             // Let's just hope that we've also got our own type annotation!
             let typeName =

WoofWare.Myriad.Plugins/JsonSerializeGenerator.fs

@@ -147,6 +147,12 @@ module internal JsonSerializeGenerator =
             |> SynExpr.createLambda "field"
             |> fun e -> e, false
         | JsonNode -> SynExpr.createIdent "id", true
+        | Unit ->
+            SynExpr.createLambda
+                "value"
+                (SynExpr.createLongIdent [ "System" ; "Text" ; "Json" ; "Nodes" ; "JsonObject" ]
+                 |> SynExpr.applyTo (SynExpr.CreateConst ())),
+            false
         | _ ->
             // {type}.toJsonNode
             let typeName =

WoofWare.Myriad.Plugins/SynExpr/Ident.fs

@@ -16,6 +16,7 @@ module internal Ident =
     let createSanitisedParamName (s : string) =
         match s with
         | "type" -> create "type'"
+        | "private" -> create "private'"
         | _ ->
 
         let result = StringBuilder ()

WoofWare.Myriad.Plugins/SynExpr/SynType.fs

@@ -193,6 +193,17 @@ module internal SynTypePatterns =
             | _ -> None
         | _ -> None
 
+    let (|Unit|_|) (fieldType : SynType) : unit option =
+        match fieldType with
+        | SynType.LongIdent (SynLongIdent.SynLongIdent (ident, _, _)) ->
+            match ident |> List.map (fun i -> i.idText.ToLowerInvariant ()) with
+            | [ "microsoft" ; "fsharp" ; "core" ; "unit" ]
+            | [ "fsharp" ; "core" ; "unit" ]
+            | [ "core" ; "unit" ]
+            | [ "unit" ] -> Some ()
+            | _ -> None
+        | _ -> None
+
     let (|DateOnly|_|) (fieldType : SynType) =
         match fieldType with
         | SynType.LongIdent (SynLongIdent.SynLongIdent (ident, _, _)) ->