SkipValuesOnUpdate/Insert at class level

Would it be possible to apply the SkipValuesOnUpdate and SkipValuesOnUpdate attribute at class level? Currently it is only effective at member level, but when applying a path-based Column attribute on a complex member, SkipValuesOnUpdate cannot be applied.

For example, if I supply only the customer name and not surname, I want to skip the surname field being updated to a null in the below model:

[Table("tbl_customer")]
[Column("customer_name", "Customer.Name"), SkipValuesOnUpdate(null) <-- cannot be applied 
[Column("customer_surname", "Customer.Surname"), SkipValuesOnUpdate(null) <-- cannot be applied here]
public class SomeModel
{
   ...
   [NotColumn, SkipValuesOnUpdate(null) <-- has no effect here]
   public CustomerModel Customer { get; set; }
}

this is based off the example here -> https://github.com/linq2db/linq2db/blob/master/Tests/Model/ComplexPerson.cs

[sdanyliv]

Great, it is much better than extending API.

[Quentinb]

I’ve spent some time on getting this to work and going through the code and have managed to get it to work without needing to change any code in Linq2DB itself.

The quick fix is to apply the SkipValuesOnUpdate on the actual sub-class members. i.e:

[Table("tbl_customer")]
[Column("customer_name"   , "Customer.Name")]
[Column("customer_surname", "Customer.Surname")]
public class SomeModel
{
   [NotColumn]
   public CustomerModel Customer { get; set; }
}

public CustomerModel
{
   [SkipValuesOnUpdate(null)]
   public string Name { get; set; }

   [SkipValuesOnUpdate(null)]
   public string Surname { get; set; }
}