I'm thinking the best/only way to go is to use something like
"LockMode.PESSIMISTIC_FORCE_INCREMENT".
Peter
On Friday, September 25, 2015 at 12:26:04 PM UTC-4, Peter V wrote:
>
> Unfortunately no. Just OID and Version.
>
>
>
>
> On 25 September 2015 at 11:37, Gunnar Liljas wrote:
>
>> Do you have another property on Person that can be changed explicitly
>> instead, perhaps a ModifiedOn timestamp, thereby triggering version
>> increment?
>>
>> 2015-09-25 16:27 GMT+02:00 Peter V:
>>
>>> But is there an elegant way to just force NHibernate to update the
>>> version number of both toPerson and fromPerson when TransferProperty is
>>> called?
>>>
>>> Locking fromPerson as dirty doesn't do it (I guess because nothing
>>> actually changed), and I'm trying to avoid modifying the class mapping (the
>>> regression test effort of doing so would be huge because there is so much
>>> other code that references it).
>>>
>>> Thanks,
>>> Peter
>>>
>>>
>>>
>>>
>>>
>>> On Friday, September 25, 2015 at 1:35:40 AM UTC-4, Gunnar Liljas wrote:
>>>>
>>>> It is removed from toPerson as a side effect since the collection is
>>>> mapped as inverse, and you change the Owner. But NHibernate has no way of
>>>> knowing this.
>>>>
>>>> Since Property really seems to be a full blown entity, maybe you can
>>>> handle deletions of it explicity (with session.Delete), and thereby be
>>>> able
>>>> to set the cascade to not delete orphans.
>>>>
>>>> 2015-09-25 0:16 GMT+02:00 Peter V:
>>>>
>>>>> Thanks, that's definitely a solution.
>>>>> But I'd prefer not to have to clone it if there's another way -- my
>>>>> actual Property class is a lot more complex than what I've shown here,
>>>>> and
>>>>> cloning it may introduce some other issues.
>>>>>
>>>>> The thing is, even with RemoveProperty commented out, the property is
>>>>> getting removed from fromPerson.
>>>>> So I don't understand why the version of fromPerson isn't incremented.
>>>>>
>>>>> Peter
>>>>>
>>>>>
>>>>>
>>>>> On Thursday, September 24, 2015 at 5:15:42 PM UTC-4, Gunnar Liljas
>>>>> wrote:
>>>>>>
>>>>>> With RemoveProperty commented out, nothing is done with fromPerson,
>>>>>> hence no version increment.
>>>>>>
>>>>>> I'm guessing the cascade "deletes" the property.
>>>>>>
>>>>>> Maybe instead of transferring you could remove the property from
>>>>>> fromPerson and add a cloned property to toPerson.
>>>>>>
>>>>>>
>>>>>>
>>>>>> 2015-09-24 20:37 GMT+02:00 Peter V :
>>>>>>
>>>>>>> I have the following NHibernate mapping:
>>>>>>>
>>>>>>> <class name="Person" proxy="Person" table="Person_">
>>>>>>>
>>>>>>> <id name="OID" column="OID_" type="Guid">
>>>>>>> <generator class="guid.comb"/>
>>>>>>> </id>
>>>>>>>
>>>>>>> <version name="Version" column="Version_"/>
>>>>>>>
>>>>>>> <set name="Properties" lazy="true" inverse="true"
>>>>>>> cascade="all-delete-orphan">
>>>>>>> <key column="PersonOID_"/>
>>>>>>> <one-to-many class="Property"/>
>>>>>>> </set>
>>>>>>>
>>>>>>> </class>
>>>>>>>
>>>>>>>
>>>>>>> And the following C# code:
>>>>>>>
>>>>>>> public class Property
>>>>>>> {
>>>>>>> public Person Owner;
>>>>>>> }
>>>>>>>
>>>>>>> public class Person
>>>>>>> {
>>>>>>> private ISet _properties;
>>>>>>>
>>>>>>> public void AddProperty(Property property)
>>>>>>> {
>>>>>>> property.Owner = this;
>>>>>>> _properties.Add(property);
>>>>>>> }
>>>>>>>
>>>>>>> public void RemoveProperty(Property property)
>>>>>>> {
>>>>>>> property.Owner = null;
>>>>>>> _properties.Remove(property);
>>>>>>> }
>>>>>>> }
>>>>>>>
>>>>>>> ...
>>>>>>>
>>>>>>> public void TransferProperty(Property p, Person fromPerson, Person
>>>>>>> toPerson)
>>>>>>> {
>>>>>>> //fromPerson.RemoveProperty(p);
>>>>>>> toPerson.AddProperty(p);
>>>>>>> }
>>>>>>>
>>>>>>>
>>>>>>> A call to TransferProperty results in the entity version for
>>>>>>> toPerson getting incremented, but no change to the entity version for
>>>>>>> fromPerson.
>>>>>>>
>>>>>>> This is causing me a problem when multiple users call
>>>>>>> TransferProperty at the same time -- because fromPerson version doesn't
>>>>>>> change, there is no PersistenceException thrown when two users try to
>>>>>>> transfer property from the same person at the same time.
>>>>>>>
>>>>>>> Any thoughts on the best way to modify this code so that calling
>>>>>>> TransferProperty will increment the entity versions for both toPerson
>>>>>>> and
>>>>>>> fromPerson???
>>>>>>>
>>>>>>> Thanks in advance!
>>>>>>> Peter
>>>>>>>
>>>>>>> P.S. I commented out the RemoveProperty call in TransferProperty,
>>>>>>> because it was resulting in "ObjectDeletedException: deleted object
>>>>>>> would
>>>>>>> be re-saved by cascade (remove deleted object from associations)".
>>>>>>>
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