Allow overriding SetGriddlyDefault via parameter value

Author: programcsharp

Build/CommonAssemblyInfo.cs

@@ -15,5 +15,5 @@
 //
 // You can specify all the values or you can default the Revision and Build Numbers
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("1.1.4")]
-[assembly: AssemblyFileVersion("1.1.4")]
+[assembly: AssemblyVersion("1.1.5")]
+[assembly: AssemblyFileVersion("1.1.5")]

Griddly.Mvc/GriddlyExtensions.cs

@@ -107,26 +107,41 @@ public static HtmlString AttributeIf(this HtmlHelper helper, string name, bool s
         public static void SetGriddlyDefault<T>(this Controller controller, ref T parameter, string field, T value)
         {
             if (controller.ControllerContext.IsChildAction)
-                parameter = value;
+            {
+                if (EqualityComparer<T>.Default.Equals(parameter, default(T)))
+                    parameter = value;
 
-            controller.ViewData["_griddlyDefault_" + field] = value;
+                controller.ViewData["_griddlyDefault_" + field] = parameter;
+            }
+            else
+                controller.ViewData["_griddlyDefault_" + field] = value;
         }
 
         public static void SetGriddlyDefault<T>(this Controller controller, ref T[] parameter, string field, IEnumerable<T> value)
         {
             if (controller.ControllerContext.IsChildAction)
-                parameter = value.ToArray();
+            {
+                if (parameter == null)
+                    parameter = value.ToArray();
 
-            controller.ViewData["_griddlyDefault_" + field] = value;
+                controller.ViewData["_griddlyDefault_" + field] = parameter;
+            }
+            else
+                controller.ViewData["_griddlyDefault_" + field] = value;
         }
 
         public static void SetGriddlyDefault<T>(this Controller controller, ref T?[] parameter, string field, IEnumerable<T> value)
             where T : struct
         {
             if (controller.ControllerContext.IsChildAction)
-                parameter = value.Cast<T?>().ToArray();
+            {
+                if (parameter == null)
+                    parameter = value.Cast<T?>().ToArray();
 
-            controller.ViewData["_griddlyDefault_" + field] = value;
+                controller.ViewData["_griddlyDefault_" + field] = parameter;
+            }
+            else
+                controller.ViewData["_griddlyDefault_" + field] = value;
         }
 
         public static object GetGriddlyDefault(this WebViewPage page, string field)