ISession.Lock does not determine proxies when proxies are used in a many to
many relation using cascading.
Given is the following mapping:
<class name="Person" table="Persons" >
<id name="Id">
<generator class="hilo">
<param name="table">AppDBHiLo</param>
<param name="column">NextHiValue</param>
<param name="max_lo">10</param>
</generator>
</id>
<list name="Contacts" lazy="true" cascade="all-delete-orphan"
table="Persons_Contacts">
<key column="PersonId"/>
<index column="Position"></index>
<many-to-many class="Contact" column="ContactId"/>
</list>
</class>
<class name="Contact" table="Contacts" >
<id name="Id">
<generator class="hilo">
<param name="table">AppDBHiLo</param>
<param name="column">NextHiValue</param>
<param name="max_lo">10</param>
</generator>
</id>
<list name="Entries" lazy="true" cascade="all-delete-orphan"
table="Contacts_ContactEntries">
<key column="ContactId"/>
<index column="Position"></index>
<many-to-many class="ContactEntry" column="ContactEntryId"/>
</list>
</class>
<class name="ContactEntry" table="ContactEntries" >
<id name="Id">
<generator class="hilo">
<param name="table">AppDBHiLo</param>
<param name="column">NextHiValue</param>
<param name="max_lo">10</param>
</generator>
</id>
<discriminator column="EntryType" insert="false" type="int"/>
<property name="EntryType" not-null="false" />
<joined-subclass name=" ContactEntryPostalAddress"
table="ContactEntryPostalAddresses">
<key column="ContactEntryId"/>
<property name="Street" not-null="false" />
<property name="PostalCode" not-null="false" />
<property name="City" not-null="false" />
<property name="Country" not-null="false" />
</joined-subclass>
<joined-subclass name="ContactEntryValue" table="ContactEntryValues">
<key column="ContactEntryId"/>
<property name="Value" not-null="false" />
</joined-subclass>
</class>
EntryType is an enum with values: PostalAddress = 0, Value = 1. Proxies are
always generated for all entities using an interceptor.
1. A person is loaded in a thread with its own session. The session is
disposed as soon as loading has finished.
2. The person is locked to the session available inside the GUI-thread
using ISession.Lock(person, LockMode.None).
3. A Contact is removed from the person’s contacts list and the session
is flushed.
4. Cascading with “all-delete-orphan” deletes the unreferenced contact
and its associated contact entries.
This leads to a foreign key constraint violation because contact entries in
the removed contact are only deleted in the base class table.
Tracking this down reveals that ISession.Lock does not evaluate proxies and
therefor does not find the concrete subclass represented by that object.
This happens in NHibernate.Persister.Entity.AbstractEntityPersister#
GetSubclassEntityPersister(object instance, ISessionFactoryImplementor
factory, EntityMode entityMode)
(https://github.com/nhibernate/nhibernate-core/blob/master/src/NHibernate/Persister/Entity/AbstractEntityPersister.cs#L4049).
This is commented in the source code:
// TODO : really need a way to do something like :
//
getTuplizer(entityMode).determineConcreteSubclassEntityName(instance)
The corresponding code in Hibernate has changed
(https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/persister/entity/AbstractEntityPersister.java#L4381).
Is there an issue for that problem and can I expect a fix next time?
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