advancing but not there yet.

PoweredSoft.DynamicLinq.Test/SelectTests.cs

@@ -82,11 +82,15 @@ namespace PoweredSoft.DynamicLinq.Test
         {
             var query = TestData.Authors.AsQueryable();
 
-            query.Select(t => new
+            var qs = query.Select(t => new
             {
-                Comments = t.Posts == null ? null : t.Posts.SelectMany(t2 => t2.Comments).ToList()
+                CommentLikes = t.Posts == null ? 
+                    new List<CommentLike>() :
+                    t.Posts.Where(t2 => t2.Comments != null).SelectMany(t2 => t2.Comments.Where(t3 => t3.CommentLikes != null).SelectMany(t3 => t3.CommentLikes)).ToList()
             });
 
+            var a = qs.ToList();
+
             var querySelect = query.Select(t =>
             {
                 t.NullChecking(true);

PoweredSoft.DynamicLinq.Test/TestData.cs

@@ -168,6 +168,12 @@ namespace PoweredSoft.DynamicLinq.Test
                         Content = "ASD"
                     }
                 }
+            },
+            new Author
+            {
+                Id = 3,
+                FirstName = "Mark",
+                LastName = "Ronson"
             }
         };
     }

PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs

@@ -213,8 +213,8 @@ namespace PoweredSoft.DynamicLinq.Helpers
                 var notGroupedType = expr.Type.GenericTypeArguments.FirstOrDefault();
                 if (notGroupedType == null)
                     throw new Exception($"Path must be a Enumerable<T> but its a {expr.Type}");
-                
-                var body = Expression.Call(typeof(Enumerable), "ToList", new[] { notGroupedType }, expr);
+
+                var body = Expression.Call(typeof(Enumerable), "ToList", new[] { notGroupedType }, expr) as Expression;
                 return body;
             }