From aed2d3fcfee0d0c9be68b3e8452376dcb9bff7bd Mon Sep 17 00:00:00 2001
From: Ko <kochang.chu@gmail.com>
Date: Tue, 12 Aug 2025 12:16:29 +1000
Subject: [PATCH 1/2] according to GraphQL spec, enum is part of the valid
 input fields, which should not be skipped

---
 src/EntityGraphQL/Schema/SchemaIntrospection.cs | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/src/EntityGraphQL/Schema/SchemaIntrospection.cs b/src/EntityGraphQL/Schema/SchemaIntrospection.cs
index 3a494d7f..409744b3 100644
--- a/src/EntityGraphQL/Schema/SchemaIntrospection.cs
+++ b/src/EntityGraphQL/Schema/SchemaIntrospection.cs
@@ -7,7 +7,6 @@
 using EntityGraphQL.Directives;
 #endif
 
-
 namespace EntityGraphQL.Schema;
 
 public static class SchemaIntrospection
@@ -117,10 +116,6 @@ private static List<TypeElement> BuildInputTypes(ISchemaProvider schema)
                 if (field.ResolveExpression?.NodeType == System.Linq.Expressions.ExpressionType.Call)
                     continue;
 
-                // Skipping ENUM type
-                if (field.ReturnType.TypeDotnet.IsEnum)
-                    continue;
-
                 inputValues.Add(new InputValue(field.Name, BuildType(schema, field.ReturnType, field.ReturnType.TypeDotnet, true)) { Description = field.Description });
             }
 

From 28f6ca34209144adcce2b9c4976a3e4c92990433 Mon Sep 17 00:00:00 2001
From: Ko <kochang.chu@gmail.com>
Date: Tue, 12 Aug 2025 12:47:22 +1000
Subject: [PATCH 2/2] Add unit test for enum input fields in GraphQL
 introspection

---
 .../IntrospectionTests/IntrospectionTests.cs  | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/src/tests/EntityGraphQL.Tests/IntrospectionTests/IntrospectionTests.cs b/src/tests/EntityGraphQL.Tests/IntrospectionTests/IntrospectionTests.cs
index d01573bd..c287017a 100644
--- a/src/tests/EntityGraphQL.Tests/IntrospectionTests/IntrospectionTests.cs
+++ b/src/tests/EntityGraphQL.Tests/IntrospectionTests/IntrospectionTests.cs
@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using EntityGraphQL.Schema;
@@ -7,6 +8,45 @@ namespace EntityGraphQL.Tests;
 
 public class IntrospectionTests
 {
+    [Fact]
+    public void IncludeEnumInputField_Introspection()
+    {
+        var schema = SchemaBuilder.FromObject<TestDataContext>();
+
+        schema.AddInputType<EnumInputArgs>("EnumInputArgs", "args with enums").AddAllFields();
+
+        var gql = new QueryRequest
+        {
+            Query =
+                @"query {
+                        __type(name: ""EnumInputArgs"") {
+                            name
+                            inputFields {
+                                name
+                                type { kind name ofType { kind name } }
+                            }
+                        }
+                    }",
+        };
+
+        var result = schema.ExecuteRequestWithContext(gql, new TestDataContext(), null, null);
+        Assert.Null(result.Errors);
+
+        var fields = (IEnumerable<dynamic>)((dynamic)result.Data!["__type"]!).inputFields;
+        Assert.Contains(fields, f => f.name == "unit");
+
+        var unitField = fields.First(f => f.name == "unit");
+        Assert.Equal("NON_NULL", unitField.type.kind);
+        Assert.Equal("ENUM", unitField.type.ofType.kind);
+        Assert.Equal("HeightUnit", unitField.type.ofType.name);
+    }
+
+    private class EnumInputArgs
+    {
+        public HeightUnit Unit { get; set; }
+        public DayOfWeek Day { get; set; }
+    }
+
     [Fact]
     public void TestGraphiQLIntrospection()
     {