[Solved] inheritance and identity

[mromani]

I have  2 classes, Persona and Alumno like this

namespace FormaModel
{
    [Persistent(IdentityField = "id", VersionField = "version")]
    public abstract class Persona
    {
        protected int id;

        [FieldAlias("id")]
        public int Id
        {
            get { return id; }
            set { id = value; }
        }

        private string nombre;

        public string Nombre
        {
            get { return nombre; }
            set { nombre = value; }
        }

        protected short version;

        [FieldAlias("version")]
        public short VERSION
        {
            get { return version; }
            set { version = value; }
        }
    }
}

namespace FormaModel
{
    [Telerik.OpenAccess.Persistent()]
    public class Alumno : Persona
    {

        private int clase;

        public int Clase
        {
            get { return clase; }
            set { clase = value; }
        }

    }
}

I use a RadGrid to show all objects from class Alumno I can also add a new one but, when I try to update i always get the following error

Changes are not possible if the primary key fields are not visible.
Please specify the id and version fields in the persistent attribute.
[Telerik.OpenAccess.Persistent(IdentityFied="id", VersionField="version"]

[UnsupportedException: Changes are not possible if the primary key fields are not visible.
Please specify the id and version fields in the persistent attribute.
[Telerik.OpenAccess.Persistent(IdentityFied="id", VersionField="version"]]
   Telerik.OpenAccess.RT.DataSource.OpenAccessDataSourceView.CreateObjectId(IDictionary keys, String& oldVersion) +99
   Telerik.OpenAccess.RT.DataSource.OpenAccessDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +215
   System.Web.UI.DataSourceView.Update(IDictionary keys, IDictionary values, IDictionary oldValues, DataSourceViewOperationCallback callback) +92
   Telerik.Web.UI.GridTableView.PerformUpdate(GridEditableItem editedItem, Boolean suppressRebind) +353
   Telerik.Web.UI.GridCommandEventArgs.ExecuteCommand(Object source) +1996


In OpenAccess guide it says you just need to specify identity and version in the base class, not in subclasses so I don't know.
Id and version fileds are protected in the base class so visible from the subclass.

I have used OpneAccess 2009.02 version (purchased) and I have now installed trial 2010.1 and I still have the same problem.

Any ideas about what I'm doing wrong?

Thanks
Miguel

[IT-Als]

Hi Miguel,

You should declare the Persistent attribute (with version og id arguments) on the "table generating class" - that is -  the Alumno class in your case. On the abstract you just declare the Persistent attribute.

I have written a blog post about this. Check it out.

Regards

Henrik

[mromani]

Hi Enrik,

My apologies for not answering you earlier I have been involved in other projects.

Your comment  made me understooth a lot of things.

I'm now implmenting your BaseEntity strategy.

Thanks

Miguel