refactor: nullable method

Author: pdevito3

QueryKit/Extensions.cs

@@ -0,0 +1,9 @@
+namespace QueryKit;
+
+internal static class Extensions
+{
+    public static bool IsNullable(this Type type)
+    {
+        return type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
+    }
+}

QueryKit/FilterParser.cs

@@ -394,12 +394,9 @@ private static Expression CreateRightExprFromType(Type leftExprType, string righ
 
     private static Type TransformTargetTypeIfNullable(Type targetType)
     {
-        if (targetType.IsGenericType)
+        if (targetType.IsNullable())
         {
-            if (targetType.GetGenericTypeDefinition() == typeof(Nullable<>))
-            {
-                targetType = Nullable.GetUnderlyingType(targetType);
-            }
+            targetType = Nullable.GetUnderlyingType(targetType);
         }
 
         return targetType;