Customizing Entity Framework Code First

Question

I have a database with a table :

User { UserId, Name, Number, DateCreated, DateEffective, DateEnd, DateReplaced }

I expose the information in the database containing the table through WCF Data Services.

1) the columns : DateCreated, DateEffective, DateEnd, DateReplaced are for keeping historical records and as such should not appear to the clients using my WCF Data Service.

2) also, Whenever a client makes the query :

         var q = from u in service.Users select u;

I want it to return only the users who have the DateEnd column set to null.

Is there any way to achieve that functionality ?

Answer 1

1 If you're going through WCF you're serializing to XML, right? So mark the properties that you don't want to be serialized as NonSerialized.

[NonSerialized()] public string test; [MSDN NonSerializedAttribute Class][1]

2 You'll have to expose a method for the client to access that has already filtered the null DateEnd columns out.

Such as

public class Service{
private List<User> _users;
public List<User> Users {
    get{
        from u in _users where u.DateEnd == null select u
    }
}
...

}