Default expansion of dictionaries supported (#240)

* Dictionaries supported within DefaultExpansionsBuilder.

* Handle dictionaries the same way lists are handled.

Add an implementation of GetUnderlyingElementType inside AutoMapper.AspNet.OData instead of using the one from LogicBuilder.Expressions.Utils.

* Add tests for dictionaries of complex types.

* fix configuration validation test

* Staying with the previously referenced LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType in LinqExtensions.

---------

Co-authored-by: Blaise Taylor <btaylor@bPolicySolutions.com>

Author: alexmo16

AutoMapper.AspNetCore.OData.EFCore/Expansions/DefaultExpansionsBuilder.cs

@@ -50,17 +50,17 @@ public void Build(List<LambdaExpression> memberSelectors, ParameterExpression pa
 
                 if (LogicBuilder.Expressions.Utils.TypeExtensions.IsLiteralType(memberType))
                     continue;
-
+                
                 if (LogicBuilder.Expressions.Utils.TypeExtensions.IsList(memberType)
                     && LogicBuilder.Expressions.Utils.TypeExtensions.IsLiteralType
                         (
-                            LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(memberType)
+                            TypeExtensions.GetUnderlyingElementType(memberType)
                         ) == false)
                 {
                     List<LambdaExpression> childMemberSelectors = [];
                     ParameterExpression childParam = Expression.Parameter
                     (
-                         LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(memberType),
+                         TypeExtensions.GetUnderlyingElementType(memberType),
                          GetChildParameterName(param.Name)
                     );
 
@@ -76,7 +76,7 @@ public void Build(List<LambdaExpression> memberSelectors, ParameterExpression pa
                                 (
                                     typeof(Enumerable),
                                     "Select",
-                                    [LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(selector), typeof(object)],
+                                    [TypeExtensions.GetUnderlyingElementType(selector), typeof(object)],
                                     selector,
                                     childSelector
                                 ),

AutoMapper.AspNetCore.OData.EFCore/LinqExtensions.cs

@@ -398,7 +398,7 @@ public static Expression GetSkipCall(this Expression expression, int? skip)
             (
                 expression.Type.IsIQueryable() ? typeof(Queryable) : typeof(Enumerable),
                 "Skip",
-                new[] { expression.GetUnderlyingElementType() },
+                new[] { LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(expression) },
                 expression,
                 Expression.Constant(skip.Value)
             );
@@ -412,7 +412,7 @@ public static Expression GetTakeCall(this Expression expression, int? top)
             (
                 expression.Type.IsIQueryable() ? typeof(Queryable) : typeof(Enumerable),
                 "Take",
-                new[] { expression.GetUnderlyingElementType() },
+                new[] { LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(expression) },
                 expression,
                 Expression.Constant(top.Value)
             );
@@ -433,15 +433,15 @@ public static Expression GetOrderByCountCall(this Expression expression, CountNo
 
         public static Expression GetOrderByCountCall(this Expression expression, CountNode countNode, string methodName, ODataQueryContext context, string selectorParameterName = "a")
         {
-            Type sourceType = expression.GetUnderlyingElementType();
+            Type sourceType = LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(expression);
             ParameterExpression param = Expression.Parameter(sourceType, selectorParameterName);
 
             Expression countSelector;
 
             if (countNode.FilterClause is not null)
             {
                 string memberFullName = countNode.GetPropertyPath();
-                Type filterType = sourceType.GetMemberInfoFromFullName(memberFullName).GetMemberType().GetUnderlyingElementType();
+                Type filterType = LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(sourceType.GetMemberInfoFromFullName(memberFullName).GetMemberType());
                 LambdaExpression filterExpression = countNode.FilterClause.GetFilterExpression(filterType, context);
                 countSelector = param.MakeSelector(memberFullName).GetCountCall(filterExpression);
             }
@@ -465,7 +465,7 @@ public static Expression GetOrderByCountCall(this Expression expression, CountNo
 
         public static Expression GetOrderByCall(this Expression expression, string memberFullName, string methodName, string selectorParameterName = "a")
         {
-            Type sourceType = expression.GetUnderlyingElementType();
+            Type sourceType = LogicBuilder.Expressions.Utils.TypeExtensions.GetUnderlyingElementType(expression);
             MemberInfo memberInfo = sourceType.GetMemberInfoFromFullName(memberFullName);
             return Expression.Call
             (

AutoMapper.AspNetCore.OData.EFCore/TypeExtensions.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Reflection;
 
 namespace AutoMapper.AspNet.OData
@@ -102,6 +103,31 @@ List<Type> DoLoad(List<Type> allTypes)
 
         public static Dictionary<EdmTypeStructure, Type> GetEdmToClrTypeMappings() => Constants.EdmToClrTypeMappings;
 
+        public static Type GetUnderlyingElementType(this Type type)
+        {
+            TypeInfo typeInfo = type.GetTypeInfo();
+            if (typeInfo.IsArray)
+                return typeInfo.GetElementType();
+
+            if (!type.IsGenericType)
+                throw new ArgumentException(nameof(type));
+
+            Type[] genericArguments = type.GetGenericArguments();
+            Type genericTypeDefinition = type.GetGenericTypeDefinition();
+
+            if (genericTypeDefinition == typeof(IGrouping<,>))
+                return genericArguments[1];
+            else if (typeof(IDictionary<,>).IsAssignableFrom(genericTypeDefinition))
+                return typeof(KeyValuePair<,>).MakeGenericType(genericArguments[0], genericArguments[1]);
+            else if (genericArguments.Length == 1)
+                return genericArguments[0];
+            else
+                throw new ArgumentException(nameof(type));
+        }
+
+        public static Type GetUnderlyingElementType(this Expression expression)
+           => GetUnderlyingElementType(expression.Type);
+
         private class AssemblyResolver : IAssemblyResolver
         {
             private List<Assembly> _assemblides;

AutoMapper.OData.EFCore.Tests/AirVinylData/AirVinylDatabaseInitializer.cs

@@ -302,10 +302,16 @@ public static void SeedDatabase(AirVinylDbContext context)
 
             context.DynamicVinylRecordProperties.Add(new DynamicProperty()
             {
-                VinylRecordId = vinylRecords.First(r => r.Title == "Nevermind").VinylRecordId,//1,
+                VinylRecordId = vinylRecords.First(r => r.Title == "Nevermind").VinylRecordId,//1
                 Key = "Publisher",
                 Value = "Geffen"
             });
+            context.DynamicVinylRecordProperties.Add(new DynamicProperty()
+            {
+                VinylRecordId = vinylRecords.First(r => r.Title == "Nevermind").VinylRecordId,//1
+                Key = "SomeData",
+                Value = new { TestProp = "value" }
+            });
             context.SaveChanges();
 
             context.DoorManufacturers.AddRange(

AutoMapper.OData.EFCore.Tests/AirVinylModel/VinylLinkModel.cs

@@ -0,0 +1,7 @@
+namespace AutoMapper.OData.EFCore.Tests.AirVinylModel
+{
+    public class VinylLinkModel
+    {
+        public string Href { get; set; }
+    }
+}

AutoMapper.OData.EFCore.Tests/AirVinylModel/VinylRecordModel.cs

@@ -33,5 +33,22 @@ public class VinylRecordModel
             = new List<DynamicPropertyModel>();
 
         public IDictionary<string, object> Properties { get; set; }
+
+        private Dictionary<string, VinylLinkModel> _links;
+        public IDictionary<string, VinylLinkModel> Links { 
+            get 
+            {
+                if (_links is null)
+                {
+                    _links = new Dictionary<string, VinylLinkModel>()
+                    {
+                        { "buyingLink", new VinylLinkModel { Href = $"http://test/buy/{VinylRecordId}" } },
+                        { "reviewLink", new VinylLinkModel { Href = $"http://test/review/{VinylRecordId}" } }
+                    };
+                }
+
+                return _links;
+            } 
+        }            
     }
 }

AutoMapper.OData.EFCore.Tests/ExpansionTests.cs

@@ -1,6 +1,7 @@
 using AutoMapper.AspNet.OData;
 using AutoMapper.OData.EFCore.Tests.AirVinylData;
 using AutoMapper.OData.EFCore.Tests.AirVinylModel;
+using LogicBuilder.Expressions.Utils;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.OData;
 using Microsoft.AspNetCore.OData.Query;
@@ -42,6 +43,28 @@ void Test(ICollection<PersonModel> collection)
             }
         }
 
+        [Fact]
+        public async Task GetVinylRecordsExpandsComplexTypesByDefault()
+        {
+            string query = "/vinylrecordmodel";
+            Test(await GetAsync<VinylRecordModel, VinylRecord>(query));
+
+            void Test(ICollection<VinylRecordModel> collection)
+            {
+                Assert.True(collection.Count > 0);
+
+                //Navigation properties
+                Assert.True(collection.All(vinyl => vinyl.Person is null));
+                Assert.True(collection.All(vinyl => vinyl.PressingDetail is null));
+                
+                //Complex types
+                Assert.Contains(collection, vinyl => vinyl.Properties.Count != 0);
+                Assert.Contains(collection, vinyl => vinyl.Properties.Any(p => !p.Value.GetType().IsLiteralType()));
+                Assert.Contains(collection, vinyl => vinyl.DynamicVinylRecordProperties.Count != 0);
+                Assert.Contains(collection, vinyl => vinyl.Links.Count != 0);
+            }
+        }
+
         [Fact]
         public async Task GetRecordStoresExpandsComplexTypesByDefault()
         {

AutoMapper.OData.EFCore.Tests/Mappings/AirVinylMappings.cs

@@ -30,6 +30,7 @@ public AirVinylMappings()
             CreateMap<SpecializedRecordStore, SpecializedRecordStoreModel>()
                 .ForAllMembers(o => o.ExplicitExpansion());
             CreateMap<VinylRecord, VinylRecordModel>()
+                .ForMember(dest => dest.Links, o => o.Ignore())
                 .ForAllMembers(o => o.ExplicitExpansion());
         }
     }