nhibernate many-to-many bag not inserting in the association table - nhibernate

Question

I know this has been asked and answered a number of times, but I have two classes that are many-to-many. I've reciprocal mapped them using bags. Here is the NHibernate Mapping:
Calendar:
<?xml version="1.0" encoding="utf-8"?>
<!--Generated by NHibernate.Mapping.Attributes on 2009-10-09 18:09:29Z.-->
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Calendar.Calendar, Calendar" table="Calendars">
<id name="CalendarId" column="CalendarId" type="Int32">
<generator class="native" />
</id>
<property name="Name" length="100" />
<property name="CalendarStatus" />
<property name="CalendarType" type="Calendar.GenericEnumMapper`1[[Calendar.CalendarType, Calendar, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Calendar" length="50" />
<property name="RecordCreatedBy" column="CreatedBy" length="50" />
<property name="RecordModifiedBy" column="ModifiedBy" length="50" />
<property name="CreateDate" />
<property name="ModifiedDate" />
<bag name="Events" table="CalendarEventsInCalendar" cascade="all">
<key column="CalendarId" />
<many-to-many class="Calendar.CalendarEvent, Calendar" column="CalendarEventId" />
</bag>
</class>
</hibernate-mapping>
CalendarEvent:
<?xml version="1.0" encoding="utf-8"?>
<!--Generated by NHibernate.Mapping.Attributes on 2009-10-09 18:27:46Z.-->
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
<class name="Calendar.CalendarEvent, Calendar" table="CalendarEvents">
<id name="CalendarEventId" column="CalendarEventId" type="Int32">
<generator class="native" />
</id>
<property name="EventStatus" />
<property name="StartTime" />
<property name="EndTime" />
<property name="ImageUrl" length="255" />
<property name="Description" length="2000" />
<property name="LocationName" length="255" />
<property name="Address1" length="255" />
<property name="Address2" length="255" />
<property name="City" length="255" />
<property name="State" length="255" />
<property name="Zip" length="10" />
<property name="Title" length="255" />
<property name="Url" length="255" />
<property name="ExternalSystemId" />
<property name="ExternalSystem" type="Calendar.GenericEnumMapper`1[[Calendar.ExternalSystemType, Calendar, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], Calendar" length="50" />
<property name="RecordCreatedBy" column="CreatedBy" length="50" />
<property name="RecordModifiedBy" column="ModifiedBy" length="50" />
<property name="CreateDate" />
<property name="ModifiedDate" />
<many-to-one name="ParentEvent" column="ParentEventId" />
<bag name="ChildEvents" lazy="true" fetch="subselect" cascade="all" inverse="true">
<key column="ParentEventId" />
<one-to-many class="Calendar.CalendarEvent, Calendar" />
</bag>
<bag name="Calendars" table="CalendarEventsInCalendar" lazy="false" inverse="true">
<key column="CalendarEventId" />
<many-to-many class="Calendar.Calendar, Calendar" column="CalendarId" />
</bag>
</class>
</hibernate-mapping>
And here's how I add an Event to a Calendar:
public virtual void AddEvent(CalendarEvent calEvent)
{
if(!calEvent.Calendars.Contains(this))
calEvent.Calendars.Add(this);
Events.Add(calEvent);
}
Then I do a SaveOrUpdate(calendar)
Any ideas?

Answer 1

You have to wrap the SaveOrUpdate in a transaction and then do Transaction.Commit(). Otherwise, the Mapping doesn't save, only the entities.
Thanks,
Jason

Answer 2

I think the problem is in inverse=true for CalendarEvent. You should remove it