Gets a little more validation working and creating using the new Save models

src/Umbraco.Core/Models/Mapping/MappingExpressionExtensions.cs

@@ -0,0 +1,20 @@
+using AutoMapper;
+
+namespace Umbraco.Core.Models.Mapping
+{
+    internal static class MappingExpressionExtensions
+    {
+        /// <summary>
+        /// Ignores all unmapped members by default - Use with caution!
+        /// </summary>
+        /// <typeparam name="TSource"></typeparam>
+        /// <typeparam name="TDest"></typeparam>
+        /// <param name="expression"></param>
+        /// <returns></returns>
+        public static IMappingExpression<TSource, TDest> IgnoreAllUnmapped<TSource, TDest>(this IMappingExpression<TSource, TDest> expression)
+        {
+            expression.ForAllMembers(opt => opt.Ignore());
+            return expression;
+        }
+    }
+}