/// <summary>
/// Converts the given <paramref name="dto"/> to a new model object, deleting the entity first if it already exists.
/// </summary>
public TModelObject ConvertReplacingExisting(TDtoObject dto, [NotNull] string id, ITransactionDataAccess dataAccess)
{
var modelObject = dataAccess.GetItem <TModelObject>(id) ?? CreateModelInstance(dto);
modelObject.Id = id ?? throw new ArgumentNullException(nameof(id));
Convert(dto, modelObject);
return(modelObject);
}