Fix serialization issue affecting nested complex property

src/Microsoft.AspNetCore.OData/Formatter/Serialization/ODataResourceSerializer.cs

@@ -248,7 +248,7 @@ await serializer.WriteDeltaObjectInlineAsync(propertyValue, edmProperty.Type, wr
             }
         }
 
-        private static IEnumerable<ODataProperty> CreateODataPropertiesFromDynamicType(EdmEntityType entityType, object graph,
+        private static IEnumerable<ODataProperty> CreateODataPropertiesFromDynamicType(EdmStructuredType structuredType, object graph,
             Dictionary<IEdmProperty, object> dynamicTypeProperties, ODataSerializerContext writeContext)
         {
             Contract.Assert(dynamicTypeProperties != null);
@@ -267,7 +267,7 @@ private static IEnumerable<ODataProperty> CreateODataPropertiesFromDynamicType(E
             {
                 foreach (var prop in dynamicObject.Values)
                 {
-                    IEdmProperty edmProperty = entityType?.Properties()
+                    IEdmProperty edmProperty = structuredType?.Properties()
                             .FirstOrDefault(p => p.Name.Equals(prop.Key, StringComparison.Ordinal));
 
                     if (prop.Value != null
@@ -321,21 +321,21 @@ private async Task WriteDynamicTypeResourceAsync(object graph, ODataWriter write
             ODataSerializerContext writeContext)
         {
             var dynamicTypeProperties = new Dictionary<IEdmProperty, object>();
-            var entityType = expectedType.Definition as EdmEntityType;
+            var structuredType = expectedType.Definition as EdmStructuredType;
             var resource = new ODataResource()
             {
                 TypeName = expectedType.FullName(),
-                Properties = CreateODataPropertiesFromDynamicType(entityType, graph, dynamicTypeProperties, writeContext)
+                Properties = CreateODataPropertiesFromDynamicType(structuredType, graph, dynamicTypeProperties, writeContext)
             };
 
             resource.IsTransient = true;
             await writer.WriteStartAsync(resource).ConfigureAwait(false);
             foreach (var property in dynamicTypeProperties.Keys)
             {
-                var resourceContext = new ResourceContext(writeContext, expectedType.AsEntity(), graph);
-                if (entityType.NavigationProperties().Any(p => p.Type.Equals(property.Type)) && !(property.Type is EdmCollectionTypeReference))
+                var resourceContext = new ResourceContext(writeContext, expectedType.AsStructured(), graph);
+                if (structuredType.NavigationProperties().Any(p => p.Type.Equals(property.Type)) && !(property.Type is EdmCollectionTypeReference))
                 {
-                    var navigationProperty = entityType.NavigationProperties().FirstOrDefault(p => p.Type.Equals(property.Type));
+                    var navigationProperty = structuredType.NavigationProperties().FirstOrDefault(p => p.Type.Equals(property.Type));
                     var navigationLink = CreateNavigationLink(navigationProperty, resourceContext);
                     if (navigationLink != null)
                     {

test/Microsoft.AspNetCore.OData.E2E.Tests/EntitySetAggregation/EntitySetAggregationController.cs

@@ -74,4 +74,32 @@ public void Generate()
             _context.SaveChanges();
         }
     }
+
+    public class EmployeesController : ODataController
+    {
+        private static readonly List<Employee> employees = new List<Employee>
+        {
+            new Employee
+            {
+                Id = 1,
+                NextOfKin = new NextOfKin { Name = "NoK 1", PhysicalAddress = new Location { City = "Redmond" } }
+            },
+            new Employee
+            {
+                Id = 2,
+                NextOfKin = new NextOfKin { Name = "NoK 2", PhysicalAddress = new Location { City = "Nairobi" } }
+            },
+            new Employee
+            {
+                Id = 3,
+                NextOfKin = new NextOfKin { Name = "NoK 3", PhysicalAddress = new Location { City = "Redmond" } }
+            }
+        };
+
+        [EnableQuery]
+        public IQueryable<Employee> Get()
+        {
+            return employees.AsQueryable();
+        }
+    }
 }

test/Microsoft.AspNetCore.OData.E2E.Tests/EntitySetAggregation/EntitySetAggregationDataModel.cs

@@ -65,4 +65,21 @@ public class Address
 
         public string Street { get; set; }
     }
+
+    public class Employee
+    {
+        public int Id { get; set; }
+        public NextOfKin NextOfKin { get; set; }
+    }
+
+    public class NextOfKin
+    {
+        public string Name { get; set; }
+        public Location PhysicalAddress { get; set; }
+    }
+
+    public class Location
+    {
+        public string City { get; set; }
+    }
 }

test/Microsoft.AspNetCore.OData.E2E.Tests/EntitySetAggregation/EntitySetAggregationTests.cs

@@ -14,6 +14,7 @@
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.OData.Edm;
+using Microsoft.OData.ModelBuilder;
 using Newtonsoft.Json.Linq;
 using Xunit;
 
@@ -202,4 +203,70 @@ public async Task AggregationOnEntitySetWorksWithGroupby()
             Assert.Equal(2 * (25 + 75), customerOnePrice);
         }
     }
+
+    public class NestedComplexPropertyAggregationTests : WebApiTestBase<NestedComplexPropertyAggregationTests>
+    {
+        public NestedComplexPropertyAggregationTests(WebApiTestFixture<NestedComplexPropertyAggregationTests> fixture)
+            : base(fixture)
+        {
+        }
+
+        protected static void UpdateConfigureServices(IServiceCollection services)
+        {
+            var builder = new ODataConventionModelBuilder();
+            builder.EntitySet<Employee>("Employees");
+
+            services.ConfigureControllers(typeof(EmployeesController));
+
+            services.AddControllers().AddOData(options => options.Select().Filter().OrderBy().Expand().Count().SkipToken().SetMaxTop(null)
+                .AddRouteComponents("aggregation", builder.GetEdmModel()));
+        }
+
+        private const string AggregationTestBaseUrl = "aggregation/Employees";
+
+        [Fact]
+        public async Task GroupByComplexProperty()
+        {
+            // Arrange
+            string queryUrl = AggregationTestBaseUrl + "?$apply=groupby((NextOfKin/Name))";
+
+            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, queryUrl);
+            request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse("application/json;odata.metadata=none"));
+            HttpClient client = this.CreateClient();
+
+            // Act
+            HttpResponseMessage response = await client.SendAsync(request);
+
+            // Assert
+            var result = await response.Content.ReadAsObject<JObject>();
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var results = result["value"] as JArray;
+            Assert.Equal(3, results.Count);
+            Assert.Equal("NoK 1", (results[0]["NextOfKin"] as JObject)["Name"].ToString());
+            Assert.Equal("NoK 2", (results[1]["NextOfKin"] as JObject)["Name"].ToString());
+            Assert.Equal("NoK 3", (results[2]["NextOfKin"] as JObject)["Name"].ToString());
+        }
+
+        [Fact]
+        public async Task GroupByNestedComplexProperty()
+        {
+            // Arrange
+            string queryUrl = AggregationTestBaseUrl + "?$apply=groupby((NextOfKin/PhysicalAddress/City))";
+
+            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, queryUrl);
+            request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse("application/json;odata.metadata=none"));
+            HttpClient client = this.CreateClient();
+
+            // Act
+            HttpResponseMessage response = await client.SendAsync(request);
+
+            // Assert
+            var result = await response.Content.ReadAsObject<JObject>();
+            Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+            var results = result["value"] as JArray;
+            Assert.Equal(2, results.Count);
+            Assert.Equal("Redmond", ((results[0]["NextOfKin"] as JObject)["PhysicalAddress"] as JObject)["City"].ToString());
+            Assert.Equal("Nairobi", ((results[1]["NextOfKin"] as JObject)["PhysicalAddress"] as JObject)["City"].ToString());
+        }
+    }
 }