ID type deserialization fix with field tests (#427)

* Fixed deserialization of ID type

Deserialization of ID types caused an exception if the field was
nullable.

* Added fields for testing

---------

Co-authored-by: Håkan Thörngren <hth313@gmail.com>

src/FSharp.Data.GraphQL.Client/BaseTypes.fs

@@ -348,7 +348,7 @@ module internal JsonValueHelper =
                             | Some "Date" ->
                                 match DateTime.TryParse(s, CultureInfo.InvariantCulture, DateTimeStyles.None) with
                                 | (true, d) -> box d
-                                | _ -> failwith "A string was received in the query response, and the schema recognizes it as a date and time sring, but the conversion failed."
+                                | _ -> failwith "A string was received in the query response, and the schema recognizes it as a date and time string, but the conversion failed."
                             | Some _ ->
                                 box s
                             | _ -> failwith "A string type was received in the query response item, but the matching schema field is not a string based type."
@@ -357,14 +357,16 @@ module internal JsonValueHelper =
                     | None -> failwith "Item type is a non null type, but no underlying type exists on the schema definition of the type."
                 | TypeKind.SCALAR ->
                     match schemaField.SchemaTypeRef.Name with
+                    | Some "String" | Some "ID" ->
+                        s |> makeSomeIfNeeded
                     | Some "URI" ->
-                        System.Uri(s) |> makeSomeIfNeeded
+                        s |> System.Uri |> makeSomeIfNeeded
                     | Some "Date" ->
                         match DateTime.TryParse(s, CultureInfo.InvariantCulture, DateTimeStyles.None) with
                         | (true, d) -> makeSomeIfNeeded d
-                        | _ -> failwith "A string was received in the query response, and the schema recognizes it as a date and time sring, but the conversion failed."
+                        | _ -> failwith "A string was received in the query response, and the schema recognizes it as a date and time string, but the conversion failed."
                     | Some _ ->
-                        makeSomeIfNeeded s
+                        s |> makeSomeIfNeeded
                     | _ -> failwith "A string type was received in the query response item, but the matching schema field is not a string based type."
                 | TypeKind.ENUM when schemaField.SchemaTypeRef.Name.IsSome -> EnumBase(schemaField.SchemaTypeRef.Name.Value, s) |> makeSomeIfNeeded
                 | _ -> failwith "A string type was received in the query response item, but the matching schema field is not a string based type or an enum type."

tests/FSharp.Data.GraphQL.IntegrationTests.Server/Schema.fs

@@ -20,7 +20,8 @@ type InputField =
       StringOption : string option
       IntOption : int option
       Uri : System.Uri
-      Guid : System.Guid }
+      Guid : System.Guid
+      GuidOption : System.Guid option }
 
 type Input =
     { Single : InputField option
@@ -74,6 +75,10 @@ module Schema =
                   Define.AutoField("intOption", Nullable IntType, description = "An integer option value.")
                   Define.AutoField("uri", UriType, description = "An URI value.")
                   Define.AutoField("guid", GuidType, description = "A Guid value.")
+                  Define.Field("guidId", IDType, description = "A Guid Id value.", resolve = fun _ o -> o.Guid |> string)
+                  Define.Field("stringId", IDType, description = "A String Id value.", resolve = fun _ o -> o.String)
+                  Define.Field("guidIdOption", Nullable IDType, description = "A Guid Id value.", resolve = fun _ o -> o.GuidOption |> Option.map string)
+                  Define.Field("stringIdOption", Nullable IDType, description = "A String Id value.", resolve = fun _ o -> o.StringOption)
                   Define.Field("deprecated", StringType, resolve = (fun _ x -> x.String), description = "A string value through a deprecated field.", deprecationReason = "This field is deprecated.", args = []) ])
 
     let UploadedFileType =