[Ignore] atbt discerning Insert/Update

QueryBuilder/IgnoreInsertAttribute.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace SqlKata
+{
+    /// <summary>
+    /// This class is used as metadata to ignore a property on insert queries
+    /// </summary>
+    /// <example>
+    /// <code>
+    /// public class  Person
+    /// {
+    ///    public string Name {get ;set;}
+    ///
+    ///    [IgnoreInsert]
+    ///    public string PhoneNumber {get ;set;}
+    ///
+    /// }
+    ///
+    /// new Query("Table").Insert(new Person { Name = "User", PhoneNumber = "70123456" })
+    ///
+    /// output: INSERT INTO [Table] ([Name]) VALUES('User')
+    /// </code>
+    /// </example>
+    public class IgnoreInsertAttribute : Attribute
+    {
+    }
+}

QueryBuilder/IgnoreUpdateAttribute.cs

@@ -0,0 +1,27 @@
+using System;
+
+namespace SqlKata
+{
+    /// <summary>
+    /// This class is used as metadata to ignore a property on update queries
+    /// </summary>
+    /// <example>
+    /// <code>
+    /// public class  Person
+    /// {
+    ///    public string Name {get ;set;}
+    ///
+    ///    [IgnoreUpdate]
+    ///    public string PhoneNumber {get ;set;}
+    ///
+    /// }
+    ///
+    /// new Query("Table").Update(new Person { Name = "User", PhoneNumber = "70123456" })
+    ///
+    /// output: UPDATE INTO [Table] ([Name]) VALUES('User')
+    /// </code>
+    /// </example>
+    public class IgnoreUpdateAttribute : Attribute
+    {
+    }
+}

QueryBuilder/Query.Update.cs

@@ -9,7 +9,7 @@ public partial class Query
     {
         public Query AsUpdate(object data)
         {
-            var dictionary = BuildKeyValuePairsFromObject(data, considerKeys: true);
+            var dictionary = BuildKeyValuePairsFromObject(data, considerKeys: true, insert: false);
 
             return AsUpdate(dictionary);
         }

QueryBuilder/Query.cs

@@ -402,14 +402,16 @@ public object FindVariable(string variable)
         /// and will add it automatically to the Where clause
         /// </param>
         /// <returns></returns>
-        private IEnumerable<KeyValuePair<string, object>> BuildKeyValuePairsFromObject(object data, bool considerKeys = false)
+        private IEnumerable<KeyValuePair<string, object>> BuildKeyValuePairsFromObject(object data, bool considerKeys = false, bool insert= true)
         {
             var dictionary = new Dictionary<string, object>();
             var props = CacheDictionaryProperties.GetOrAdd(data.GetType(), type => type.GetRuntimeProperties().ToArray());
 
             foreach (var property in props)
             {
-                if (property.GetCustomAttribute(typeof(IgnoreAttribute)) != null)
+                if ((property.GetCustomAttribute(typeof(IgnoreAttribute)) != null) ||
+                    (property.GetCustomAttribute(typeof(IgnoreUpdateAttribute)) != null && !insert) ||
+                    (property.GetCustomAttribute(typeof(IgnoreInsertAttribute)) != null && insert))
                 {
                     continue;
                 }