Making Roles Multi-Tenant

{
    protected override void SetInternalFields()
    {
        base.SetInternalFields();
        if (IsCreate)
            Row.TenantId = ((UserDefinition)Authorization.UserDefinition).TenantId;
    }
     protected override void ValidateRequest()
     {
         base.ValidateRequest();
         if (IsUpdate)
         {
             var user = (UserDefinition)Authorization.UserDefinition;
             if (Old.TenantId != user.TenantId)
     }
}
private class MyDeleteHandler : DeleteRequestHandler<MyRow>
{
    protected override void ValidateRequest()
    {
        base.ValidateRequest();
        var user = (UserDefinition)Authorization.UserDefinition;
        if (Row.TenantId != user.TenantId)
            Authorization.ValidatePermission(PermissionKeys.Tenants);
    }
}
private class MyRetrieveHandler : RetrieveRequestHandler<MyRow>
{
        base.PrepareQuery(query);
        var user = (UserDefinition)Authorization.UserDefinition;
        if (!Authorization.HasPermission(PermissionKeys.Tenants))
            query.Where(fld.TenantId == user.TenantId);
    }
}
private class MyListHandler : ListRequestHandler<MyRow>
{
    protected override void ApplyFilters(SqlQuery query)
    {
        base.ApplyFilters(query);
        var user = (UserDefinition)Authorization.UserDefinition;
        if (!Authorization.HasPermission(PermissionKeys.Tenants))
            query.Where(fld.TenantId == user.TenantId);