Fixed: Enums do not deserialise correctly

src/AspNetCore.Tests/QueryMiddlewareTests.cs

@@ -2,6 +2,7 @@
 using System.Net;
 using System.Net.Http;
 using System.Threading.Tasks;
+using HotChocolate.Types;
 using Microsoft.AspNetCore.TestHost;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
@@ -64,6 +65,36 @@ public async Task HttpPost_EnumArgument()
             Assert.Equal(Snapshot.Current(), Snapshot.New(result));
         }
 
+        [Fact]
+        public async Task HttpPost_NestedEnumArgument()
+        {
+            // arrange
+            TestServer server = CreateTestServer();
+            QueryRequestDto request = new QueryRequestDto
+            {
+                Query = "query a($a: BarInput) { withNestedEnum(bar: $a) }",
+                Variables = JObject.FromObject(new Dictionary<string, object>
+                {
+                    { "a",  new Dictionary<string, object>
+                            {
+                                { "a",  "B" }
+                            }
+                    }
+                })
+            };
+
+            // act
+            HttpResponseMessage message = await server.SendRequestAsync(request);
+
+            // assert
+            Assert.Equal(HttpStatusCode.OK, message.StatusCode);
+
+            string json = await message.Content.ReadAsStringAsync();
+            QueryResultDto result = JsonConvert.DeserializeObject<QueryResultDto>(json);
+            Assert.Null(result.Errors);
+            Assert.Equal(Snapshot.Current(), Snapshot.New(result));
+        }
+
         [Fact]
         public async Task HttpGet_BasicTest()
         {
@@ -222,7 +253,11 @@ public async Task HttpPost_WithHttpContext()
         private TestServer CreateTestServer()
         {
             return TestServerFactory.Create(
-                c => c.RegisterQueryType<QueryType>(), null);
+                c =>
+                {
+                    c.RegisterQueryType<QueryType>();
+                    c.RegisterType<InputObjectType<Bar>>();
+                }, null);
         }
     }
 }

src/AspNetCore.Tests/Schema/Foo.cs

@@ -6,4 +6,9 @@ public class Foo
         public string B { get; set; }
         public int C { get; set; }
     }
+
+    public class Bar
+    {
+        public TestEnum A { get; set; }
+    }
 }

src/AspNetCore.Tests/Schema/Query.cs

@@ -71,5 +71,10 @@ public bool GetWithEnum(TestEnum test)
         {
             return true;
         }
+
+        public TestEnum GetWithNestedEnum(Bar bar)
+        {
+            return bar.A;
+        }
     }
 }

src/AspNetCore.Tests/__snapshots__/HttpPost_NestedEnumArgument.json

@@ -0,0 +1,6 @@
+{
+  "Data": {
+    "withNestedEnum": "B"
+  },
+  "Errors": null
+}

src/Types/Types/EnumType.cs

@@ -87,6 +87,13 @@ public object ParseLiteral(IValueNode literal)
                 return ev.Value;
             }
 
+            // TODO : This fixes a deserialisation issue when an input object is deserialized from a json string. We should however fix this in the aspnet middleware.
+            if (literal is StringValueNode svn
+                && _nameToValues.TryGetValue(svn.Value, out ev))
+            {
+                return ev.Value;
+            }
+
             if (literal is NullValueNode)
             {
                 return null;