public BaseCriteria IsNull()
{
return(Criteria.IsNull());
}
private object GetExistingID(IDbConnection connection, RelationInfo info,
object thisKey)
{
var criteria = new Criteria(info.OtherKeyField.PropertyName ?? info.OtherKeyField.Name) ==
new ValueCriteria(thisKey);
if (!ReferenceEquals(null, info.FilterField))
{
var flt = new Criteria(info.FilterField.PropertyName ?? info.FilterField.Name);
if (info.FilterValue == null)
criteria &= flt.IsNull();
else
criteria &= flt == new ValueCriteria(info.FilterValue);
}
var existing = info.ListHandlerFactory().Process(connection, new ListRequest
{
ColumnSelection = ColumnSelection.KeyOnly,
Criteria = criteria
}).Entities;
if (existing.Count > 1)
throw new Exception(String.Format("Found multiple extension rows for UpdatableExtension '{0}'",
info.Attr.Alias));
if (existing.Count == 0)
return null;
return ((Field)((IIdRow)existing[0]).IdField).AsObject((Row)existing[0]);
}
