/// <summary>
/// Get one by unique key
/// </summary>
/// <param name="keyName"></param>
/// <param name="value"></param>
/// <returns></returns>
public OrQuery GetOne(string keyName, object value)
{
var keyValue = _typeDescription.MakeUniqueKeyValue(keyName, value);
var query = new OrQuery(_typeDescription.FullTypeName);
var andQuery = new AndQuery();
query.Elements.Add(andQuery);
andQuery.Elements.Add(new AtomicQuery(keyValue));
return(query);
}